syntax: 'meth' -> 'fun', 'attr' -> 'var'
[nit.git] / src / parser / parser.nit
index 4ada113..3f668cf 100644 (file)
@@ -8,12 +8,12 @@ intrude import parser_tables
 # State of the parser automata as stored in the parser stack.
 private class State
        # The internal state number
-       readable writable attr _state: Int
+       readable writable var _state: Int
 
        # The node stored with the state in the stack
-       readable writable attr _nodes: Object 
+       readable writable var _nodes: nullable Object 
 
-       init(state: Int, nodes: Object)
+       init(state: Int, nodes: nullable Object)
        do
                _state = state
                _nodes = nodes
@@ -23,13 +23,13 @@ end
 class Parser
 special ParserTable
        # Associated lexer
-       attr _lexer: Lexer
+       var _lexer: Lexer
 
        # Stack of pushed states and productions
-       attr _stack: Array[State]
+       var _stack: Array[State]
 
        # Position in the stack
-       attr _stack_pos: Int
+       var _stack_pos: Int
 
        # Create a new parser based on a given lexer
        init(lexer: Lexer)
@@ -43,7 +43,7 @@ special ParserTable
        end
 
        # Do a transition in the automata
-       private meth go_to(index: Int): Int
+       private fun go_to(index: Int): Int
        do
                var state = state
                var table = _goto_table[index]
@@ -67,7 +67,7 @@ special ParserTable
        end
 
        # Push someting in the state stack
-       private meth push(numstate: Int, list_node: Object)
+       private fun push(numstate: Int, list_node: nullable Object)
        do
                var pos = _stack_pos + 1
                _stack_pos = pos
@@ -81,13 +81,13 @@ special ParserTable
        end
 
        # The current state
-       private meth state: Int
+       private fun state: Int
        do
                return _stack[_stack_pos].state
        end
 
        # Pop something from the stack state
-       private meth pop: Object
+       private fun pop: nullable Object
        do
                var res = _stack[_stack_pos].nodes
                _stack_pos = _stack_pos -1
@@ -95,11 +95,10 @@ special ParserTable
        end
 
        # Build and return a full AST.
-       meth parse: Start
+       fun parse: Start
        do
                push(0, null)
 
-               var ign: List[Token] = null
                var lexer = _lexer
                while true do
                        var token = lexer.peek
@@ -107,7 +106,6 @@ special ParserTable
                        var last_line = token.line
 
                        if token isa PError then
-                               assert token isa PError
                                return new Start(null, token)
                        end
 
@@ -152,11 +150,11 @@ special ParserTable
                                return node
                        end
                end
-               return null
+               abort
        end
 
-       attr _reduce_table: Array[ReduceAction]
-       private meth build_reduce_table
+       var _reduce_table: Array[ReduceAction]
+       private fun build_reduce_table
        do
                _reduce_table = new Array[ReduceAction].with_items(
                        new ReduceAction0,
@@ -882,7 +880,21 @@ special ParserTable
                        new ReduceAction720,
                        new ReduceAction721,
                        new ReduceAction722,
-                       new ReduceAction723
+                       new ReduceAction723,
+                       new ReduceAction724,
+                       new ReduceAction725,
+                       new ReduceAction726,
+                       new ReduceAction727,
+                       new ReduceAction728,
+                       new ReduceAction729,
+                       new ReduceAction730,
+                       new ReduceAction731,
+                       new ReduceAction732,
+                       new ReduceAction733,
+                       new ReduceAction734,
+                       new ReduceAction735,
+                       new ReduceAction736,
+                       new ReduceAction737
                )
        end
 end
@@ -890,12 +902,13 @@ end
 # Find first and last tokens of production nodes
 private class SearchTokensVisitor
 special Visitor
-       attr _untokenned_nodes: Array[Prod]
-       attr _last_token: Token
-       redef meth visit(n: PNode)
+       var _untokenned_nodes: Array[Prod]
+       var _last_token: nullable Token = null
+       redef fun visit(n: nullable PNode)
        do
-               if n isa Token then
-                       assert n isa Token
+               if n == null then
+                       return
+               else if n isa Token then
                        _last_token = n
                        for no in _untokenned_nodes do
                                no.first_token = n
@@ -916,17 +929,17 @@ end
 
 # Each reduca action has its own class, this one is the root of the hierarchy.
 private abstract class ReduceAction
-       meth action(p: Parser) is abstract
+       fun action(p: Parser) is abstract
 end
 
 private class ReduceAction0
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var listnode3 = new Array[Object]
                                        var listnode4 = new Array[Object]
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode4
@@ -938,15 +951,15 @@ init do end
 end
 private class ReduceAction1
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode4 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode4
@@ -958,22 +971,22 @@ init do end
 end
 private class ReduceAction2
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode5 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var pmodulenode1 = new AModule.init_amodule(
+#                                      end
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode5
@@ -985,25 +998,25 @@ init do end
 end
 private class ReduceAction3
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode5 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var pmodulenode1 = new AModule.init_amodule(
+#                                      end
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode5
@@ -1015,22 +1028,22 @@ init do end
 end
 private class ReduceAction4
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode5 = new Array[Object]
-                                       var listnode4 = nodearraylist1 
+                                       var listnode4 = nodearraylist1
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pmodulenode1 = new AModule.init_amodule(
+#                                      end
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode5
@@ -1042,25 +1055,25 @@ init do end
 end
 private class ReduceAction5
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode5 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode4 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pmodulenode1 = new AModule.init_amodule(
+#                                      end
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode5
@@ -1072,32 +1085,32 @@ init do end
 end
 private class ReduceAction6
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist2 
+#                                      end
+                                       var listnode5 = nodearraylist2
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pmodulenode1 = new AModule.init_amodule(
+#                                      end
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode6
@@ -1109,35 +1122,35 @@ init do end
 end
 private class ReduceAction7
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist3 
+#                                      end
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pmodulenode1 = new AModule.init_amodule(
+#                                      end
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode6
@@ -1149,26 +1162,26 @@ init do end
 end
 private class ReduceAction8
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var ppropdefnode5 = nodearraylist1
-                                       assert ppropdefnode5 isa PPropdef
+                                       assert ppropdefnode5 isa nullable PPropdef
                                        if ppropdefnode5 != null then
                                                listnode6.add(ppropdefnode5)
                                        end
-                                       var pclassdefnode4 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode4: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode6
                                        )
                                        if pclassdefnode4 != null then
                                                listnode7.add(pclassdefnode4)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode7
@@ -1180,9 +1193,9 @@ init do end
 end
 private class ReduceAction9
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
@@ -1190,26 +1203,26 @@ special ReduceAction
                                        var listnode8 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode5 = nodearraylist1
-                                       assert ppropdefnode5 isa PPropdef
-                                       var listnode6 = nodearraylist3 
+                                       assert ppropdefnode5 isa nullable PPropdef
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
                                        if ppropdefnode5 != null then
                                                listnode7.add(ppropdefnode5)
                                        end
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pclassdefnode4 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode4: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        if pclassdefnode4 != null then
                                                listnode8.add(pclassdefnode4)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode8
@@ -1221,29 +1234,29 @@ init do end
 end
 private class ReduceAction10
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
                                        var listnode6 = new Array[Object]
                                        var ppropdefnode5 = nodearraylist2
-                                       assert ppropdefnode5 isa PPropdef
+                                       assert ppropdefnode5 isa nullable PPropdef
                                        if ppropdefnode5 != null then
                                                listnode6.add(ppropdefnode5)
                                        end
-                                       var pclassdefnode4 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode4: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode6
                                        )
                                        if pclassdefnode4 != null then
                                                listnode7.add(pclassdefnode4)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode7
@@ -1255,9 +1268,9 @@ init do end
 end
 private class ReduceAction11
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
@@ -1265,29 +1278,29 @@ special ReduceAction
                                        var listnode3 = new Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode5 = nodearraylist2
-                                       assert ppropdefnode5 isa PPropdef
-                                       var listnode6 = nodearraylist4 
+                                       assert ppropdefnode5 isa nullable PPropdef
+                                       var listnode6 = nodearraylist4
                                        assert listnode6 isa Array[Object]
                                        if ppropdefnode5 != null then
                                                listnode7.add(ppropdefnode5)
                                        end
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pclassdefnode4 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode4: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        if pclassdefnode4 != null then
                                                listnode8.add(pclassdefnode4)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode8
@@ -1299,36 +1312,36 @@ init do end
 end
 private class ReduceAction12
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode8 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist2
-                                       assert ppropdefnode6 isa PPropdef
+                                       assert ppropdefnode6 isa nullable PPropdef
                                        if ppropdefnode6 != null then
                                                listnode7.add(ppropdefnode6)
                                        end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        if pclassdefnode5 != null then
                                                listnode8.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode8
@@ -1340,46 +1353,46 @@ init do end
 end
 private class ReduceAction13
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode9 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist2
-                                       assert ppropdefnode6 isa PPropdef
-                                       var listnode7 = nodearraylist4 
+                                       assert ppropdefnode6 isa nullable PPropdef
+                                       var listnode7 = nodearraylist4
                                        assert listnode7 isa Array[Object]
                                        if ppropdefnode6 != null then
                                                listnode8.add(ppropdefnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
                                        if pclassdefnode5 != null then
                                                listnode9.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode9
@@ -1391,9 +1404,9 @@ init do end
 end
 private class ReduceAction14
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
@@ -1401,29 +1414,29 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist3
-                                       assert ppropdefnode6 isa PPropdef
+                                       assert ppropdefnode6 isa nullable PPropdef
                                        if ppropdefnode6 != null then
                                                listnode7.add(ppropdefnode6)
                                        end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        if pclassdefnode5 != null then
                                                listnode8.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode8
@@ -1435,9 +1448,9 @@ init do end
 end
 private class ReduceAction15
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -1446,38 +1459,38 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist3
-                                       assert ppropdefnode6 isa PPropdef
-                                       var listnode7 = nodearraylist5 
+                                       assert ppropdefnode6 isa nullable PPropdef
+                                       var listnode7 = nodearraylist5
                                        assert listnode7 isa Array[Object]
                                        if ppropdefnode6 != null then
                                                listnode8.add(ppropdefnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
                                        if pclassdefnode5 != null then
                                                listnode9.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode9
@@ -1489,36 +1502,36 @@ init do end
 end
 private class ReduceAction16
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode8 = new Array[Object]
-                                       var listnode4 = nodearraylist1 
+                                       var listnode4 = nodearraylist1
                                        assert listnode4 isa Array[Object]
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist2
-                                       assert ppropdefnode6 isa PPropdef
+                                       assert ppropdefnode6 isa nullable PPropdef
                                        if ppropdefnode6 != null then
                                                listnode7.add(ppropdefnode6)
                                        end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode4
                                                else
                                                        listnode8.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode8.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode8
@@ -1530,46 +1543,46 @@ init do end
 end
 private class ReduceAction17
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode9 = new Array[Object]
-                                       var listnode4 = nodearraylist1 
+                                       var listnode4 = nodearraylist1
                                        assert listnode4 isa Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist2
-                                       assert ppropdefnode6 isa PPropdef
-                                       var listnode7 = nodearraylist4 
+                                       assert ppropdefnode6 isa nullable PPropdef
+                                       var listnode7 = nodearraylist4
                                        assert listnode7 isa Array[Object]
                                        if ppropdefnode6 != null then
                                                listnode8.add(ppropdefnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode4
                                                else
                                                        listnode9.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode9.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode9
@@ -1581,9 +1594,9 @@ init do end
 end
 private class ReduceAction18
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
@@ -1591,29 +1604,29 @@ special ReduceAction
                                        var listnode3 = new Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode4 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist3
-                                       assert ppropdefnode6 isa PPropdef
+                                       assert ppropdefnode6 isa nullable PPropdef
                                        if ppropdefnode6 != null then
                                                listnode7.add(ppropdefnode6)
                                        end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode4
                                                else
                                                        listnode8.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode8.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode8
@@ -1625,9 +1638,9 @@ init do end
 end
 private class ReduceAction19
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -1636,38 +1649,38 @@ special ReduceAction
                                        var listnode3 = new Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode4 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist3
-                                       assert ppropdefnode6 isa PPropdef
-                                       var listnode7 = nodearraylist5 
+                                       assert ppropdefnode6 isa nullable PPropdef
+                                       var listnode7 = nodearraylist5
                                        assert listnode7 isa Array[Object]
                                        if ppropdefnode6 != null then
                                                listnode8.add(ppropdefnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode4
                                                else
                                                        listnode9.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode9.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode9
@@ -1679,46 +1692,46 @@ init do end
 end
 private class ReduceAction20
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode9 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist2 
+#                                      end
+                                       var listnode5 = nodearraylist2
                                        assert listnode5 isa Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode7 = nodearraylist3
-                                       assert ppropdefnode7 isa PPropdef
+                                       assert ppropdefnode7 isa nullable PPropdef
                                        if ppropdefnode7 != null then
                                                listnode8.add(ppropdefnode7)
                                        end
-                                       var pclassdefnode6 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode6: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode5
                                                else
                                                        listnode9.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode9.add(pclassdefnode6)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode9
@@ -1730,9 +1743,9 @@ init do end
 end
 private class ReduceAction21
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -1740,46 +1753,46 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode10 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist2 
+#                                      end
+                                       var listnode5 = nodearraylist2
                                        assert listnode5 isa Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppropdefnode7 = nodearraylist3
-                                       assert ppropdefnode7 isa PPropdef
-                                       var listnode8 = nodearraylist5 
+                                       assert ppropdefnode7 isa nullable PPropdef
+                                       var listnode8 = nodearraylist5
                                        assert listnode8 isa Array[Object]
                                        if ppropdefnode7 != null then
                                                listnode9.add(ppropdefnode7)
                                        end
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
-                                       var pclassdefnode6 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode6: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode9
                                        )
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode5
                                                else
                                                        listnode10.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode10.add(pclassdefnode6)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode10
@@ -1791,9 +1804,9 @@ init do end
 end
 private class ReduceAction22
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -1802,38 +1815,38 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist3 
+#                                      end
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode7 = nodearraylist4
-                                       assert ppropdefnode7 isa PPropdef
+                                       assert ppropdefnode7 isa nullable PPropdef
                                        if ppropdefnode7 != null then
                                                listnode8.add(ppropdefnode7)
                                        end
-                                       var pclassdefnode6 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode6: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode5
                                                else
                                                        listnode9.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode9.add(pclassdefnode6)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode9
@@ -1845,9 +1858,9 @@ init do end
 end
 private class ReduceAction23
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -1857,47 +1870,47 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist3 
+#                                      end
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppropdefnode7 = nodearraylist4
-                                       assert ppropdefnode7 isa PPropdef
-                                       var listnode8 = nodearraylist6 
+                                       assert ppropdefnode7 isa nullable PPropdef
+                                       var listnode8 = nodearraylist6
                                        assert listnode8 isa Array[Object]
                                        if ppropdefnode7 != null then
                                                listnode9.add(ppropdefnode7)
                                        end
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
-                                       var pclassdefnode6 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode6: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode9
                                        )
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode5
                                                else
                                                        listnode10.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode10.add(pclassdefnode6)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode10
@@ -1909,18 +1922,18 @@ init do end
 end
 private class ReduceAction24
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode5 = new Array[Object]
                                        var pclassdefnode4 = nodearraylist1
-                                       assert pclassdefnode4 isa PClassdef
+                                       assert pclassdefnode4 isa nullable PClassdef
                                        if pclassdefnode4 != null then
                                                listnode5.add(pclassdefnode4)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode5
@@ -1932,21 +1945,21 @@ init do end
 end
 private class ReduceAction25
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode5 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
                                        var pclassdefnode4 = nodearraylist2
-                                       assert pclassdefnode4 isa PClassdef
+                                       assert pclassdefnode4 isa nullable PClassdef
                                        if pclassdefnode4 != null then
                                                listnode5.add(pclassdefnode4)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode5
@@ -1958,28 +1971,28 @@ init do end
 end
 private class ReduceAction26
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var pclassdefnode5 = nodearraylist2
-                                       assert pclassdefnode5 isa PClassdef
+                                       assert pclassdefnode5 isa nullable PClassdef
                                        if pclassdefnode5 != null then
                                                listnode6.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode6
@@ -1991,31 +2004,31 @@ init do end
 end
 private class ReduceAction27
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var pclassdefnode5 = nodearraylist3
-                                       assert pclassdefnode5 isa PClassdef
+                                       assert pclassdefnode5 isa nullable PClassdef
                                        if pclassdefnode5 != null then
                                                listnode6.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode6
@@ -2027,28 +2040,28 @@ init do end
 end
 private class ReduceAction28
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var listnode4 = nodearraylist1 
+                                       var listnode4 = nodearraylist1
                                        assert listnode4 isa Array[Object]
                                        var pclassdefnode5 = nodearraylist2
-                                       assert pclassdefnode5 isa PClassdef
-                                       if listnode4 != null then
+                                       assert pclassdefnode5 isa nullable PClassdef
+#                                      if listnode4 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode4
                                                else
                                                        listnode6.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode6.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode6
@@ -2060,31 +2073,31 @@ init do end
 end
 private class ReduceAction29
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode4 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
                                        var pclassdefnode5 = nodearraylist3
-                                       assert pclassdefnode5 isa PClassdef
-                                       if listnode4 != null then
+                                       assert pclassdefnode5 isa nullable PClassdef
+#                                      if listnode4 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode4
                                                else
                                                        listnode6.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode6.add(pclassdefnode5)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode6
@@ -2096,38 +2109,38 @@ init do end
 end
 private class ReduceAction30
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist2 
+#                                      end
+                                       var listnode5 = nodearraylist2
                                        assert listnode5 isa Array[Object]
                                        var pclassdefnode6 = nodearraylist3
-                                       assert pclassdefnode6 isa PClassdef
-                                       if listnode5 != null then
+                                       assert pclassdefnode6 isa nullable PClassdef
+#                                      if listnode5 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode5
                                                else
                                                        listnode7.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode7.add(pclassdefnode6)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode7
@@ -2139,9 +2152,9 @@ init do end
 end
 private class ReduceAction31
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
@@ -2149,31 +2162,31 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist3 
+#                                      end
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
                                        var pclassdefnode6 = nodearraylist4
-                                       assert pclassdefnode6 isa PClassdef
-                                       if listnode5 != null then
+                                       assert pclassdefnode6 isa nullable PClassdef
+#                                      if listnode5 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode5
                                                else
                                                        listnode7.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode7.add(pclassdefnode6)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode7
@@ -2185,9 +2198,9 @@ init do end
 end
 private class ReduceAction32
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
@@ -2195,22 +2208,22 @@ special ReduceAction
                                        var listnode8 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var ppropdefnode5 = nodearraylist1
-                                       assert ppropdefnode5 isa PPropdef
+                                       assert ppropdefnode5 isa nullable PPropdef
                                        if ppropdefnode5 != null then
                                                listnode6.add(ppropdefnode5)
                                        end
-                                       var pclassdefnode4 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode4: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode6
                                        )
                                        var pclassdefnode7 = nodearraylist3
-                                       assert pclassdefnode7 isa PClassdef
+                                       assert pclassdefnode7 isa nullable PClassdef
                                        if pclassdefnode4 != null then
                                                listnode8.add(pclassdefnode4)
                                        end
                                        if pclassdefnode7 != null then
                                                listnode8.add(pclassdefnode7)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode8
@@ -2222,9 +2235,9 @@ init do end
 end
 private class ReduceAction33
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
@@ -2233,31 +2246,31 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode5 = nodearraylist1
-                                       assert ppropdefnode5 isa PPropdef
-                                       var listnode6 = nodearraylist3 
+                                       assert ppropdefnode5 isa nullable PPropdef
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
                                        if ppropdefnode5 != null then
                                                listnode7.add(ppropdefnode5)
                                        end
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pclassdefnode4 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode4: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        var pclassdefnode8 = nodearraylist4
-                                       assert pclassdefnode8 isa PClassdef
+                                       assert pclassdefnode8 isa nullable PClassdef
                                        if pclassdefnode4 != null then
                                                listnode9.add(pclassdefnode4)
                                        end
                                        if pclassdefnode8 != null then
                                                listnode9.add(pclassdefnode8)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode9
@@ -2269,9 +2282,9 @@ init do end
 end
 private class ReduceAction34
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
@@ -2279,25 +2292,25 @@ special ReduceAction
                                        var listnode3 = new Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
                                        var listnode6 = new Array[Object]
                                        var ppropdefnode5 = nodearraylist2
-                                       assert ppropdefnode5 isa PPropdef
+                                       assert ppropdefnode5 isa nullable PPropdef
                                        if ppropdefnode5 != null then
                                                listnode6.add(ppropdefnode5)
                                        end
-                                       var pclassdefnode4 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode4: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode6
                                        )
                                        var pclassdefnode7 = nodearraylist4
-                                       assert pclassdefnode7 isa PClassdef
+                                       assert pclassdefnode7 isa nullable PClassdef
                                        if pclassdefnode4 != null then
                                                listnode8.add(pclassdefnode4)
                                        end
                                        if pclassdefnode7 != null then
                                                listnode8.add(pclassdefnode7)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode8
@@ -2309,9 +2322,9 @@ init do end
 end
 private class ReduceAction35
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -2320,34 +2333,34 @@ special ReduceAction
                                        var listnode3 = new Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode5 = nodearraylist2
-                                       assert ppropdefnode5 isa PPropdef
-                                       var listnode6 = nodearraylist4 
+                                       assert ppropdefnode5 isa nullable PPropdef
+                                       var listnode6 = nodearraylist4
                                        assert listnode6 isa Array[Object]
                                        if ppropdefnode5 != null then
                                                listnode7.add(ppropdefnode5)
                                        end
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pclassdefnode4 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode4: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        var pclassdefnode8 = nodearraylist5
-                                       assert pclassdefnode8 isa PClassdef
+                                       assert pclassdefnode8 isa nullable PClassdef
                                        if pclassdefnode4 != null then
                                                listnode9.add(pclassdefnode4)
                                        end
                                        if pclassdefnode8 != null then
                                                listnode9.add(pclassdefnode8)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode9
@@ -2359,42 +2372,42 @@ init do end
 end
 private class ReduceAction36
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode9 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist2
-                                       assert ppropdefnode6 isa PPropdef
+                                       assert ppropdefnode6 isa nullable PPropdef
                                        if ppropdefnode6 != null then
                                                listnode7.add(ppropdefnode6)
                                        end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        var pclassdefnode8 = nodearraylist4
-                                       assert pclassdefnode8 isa PClassdef
+                                       assert pclassdefnode8 isa nullable PClassdef
                                        if pclassdefnode5 != null then
                                                listnode9.add(pclassdefnode5)
                                        end
                                        if pclassdefnode8 != null then
                                                listnode9.add(pclassdefnode8)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode9
@@ -2406,9 +2419,9 @@ init do end
 end
 private class ReduceAction37
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -2416,42 +2429,42 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode10 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist2
-                                       assert ppropdefnode6 isa PPropdef
-                                       var listnode7 = nodearraylist4 
+                                       assert ppropdefnode6 isa nullable PPropdef
+                                       var listnode7 = nodearraylist4
                                        assert listnode7 isa Array[Object]
                                        if ppropdefnode6 != null then
                                                listnode8.add(ppropdefnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
                                        var pclassdefnode9 = nodearraylist5
-                                       assert pclassdefnode9 isa PClassdef
+                                       assert pclassdefnode9 isa nullable PClassdef
                                        if pclassdefnode5 != null then
                                                listnode10.add(pclassdefnode5)
                                        end
                                        if pclassdefnode9 != null then
                                                listnode10.add(pclassdefnode9)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode10
@@ -2463,9 +2476,9 @@ init do end
 end
 private class ReduceAction38
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -2474,34 +2487,34 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist3
-                                       assert ppropdefnode6 isa PPropdef
+                                       assert ppropdefnode6 isa nullable PPropdef
                                        if ppropdefnode6 != null then
                                                listnode7.add(ppropdefnode6)
                                        end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        var pclassdefnode8 = nodearraylist5
-                                       assert pclassdefnode8 isa PClassdef
+                                       assert pclassdefnode8 isa nullable PClassdef
                                        if pclassdefnode5 != null then
                                                listnode9.add(pclassdefnode5)
                                        end
                                        if pclassdefnode8 != null then
                                                listnode9.add(pclassdefnode8)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode9
@@ -2513,9 +2526,9 @@ init do end
 end
 private class ReduceAction39
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -2525,43 +2538,43 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist3
-                                       assert ppropdefnode6 isa PPropdef
-                                       var listnode7 = nodearraylist5 
+                                       assert ppropdefnode6 isa nullable PPropdef
+                                       var listnode7 = nodearraylist5
                                        assert listnode7 isa Array[Object]
                                        if ppropdefnode6 != null then
                                                listnode8.add(ppropdefnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
                                        var pclassdefnode9 = nodearraylist6
-                                       assert pclassdefnode9 isa PClassdef
+                                       assert pclassdefnode9 isa nullable PClassdef
                                        if pclassdefnode5 != null then
                                                listnode10.add(pclassdefnode5)
                                        end
                                        if pclassdefnode9 != null then
                                                listnode10.add(pclassdefnode9)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode10
@@ -2573,42 +2586,42 @@ init do end
 end
 private class ReduceAction40
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode9 = new Array[Object]
-                                       var listnode4 = nodearraylist1 
+                                       var listnode4 = nodearraylist1
                                        assert listnode4 isa Array[Object]
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist2
-                                       assert ppropdefnode6 isa PPropdef
+                                       assert ppropdefnode6 isa nullable PPropdef
                                        if ppropdefnode6 != null then
                                                listnode7.add(ppropdefnode6)
                                        end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        var pclassdefnode8 = nodearraylist4
-                                       assert pclassdefnode8 isa PClassdef
-                                       if listnode4 != null then
+                                       assert pclassdefnode8 isa nullable PClassdef
+#                                      if listnode4 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode4
                                                else
                                                        listnode9.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode9.add(pclassdefnode5)
                                        end
                                        if pclassdefnode8 != null then
                                                listnode9.add(pclassdefnode8)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode9
@@ -2620,9 +2633,9 @@ init do end
 end
 private class ReduceAction41
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -2630,42 +2643,42 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode10 = new Array[Object]
-                                       var listnode4 = nodearraylist1 
+                                       var listnode4 = nodearraylist1
                                        assert listnode4 isa Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist2
-                                       assert ppropdefnode6 isa PPropdef
-                                       var listnode7 = nodearraylist4 
+                                       assert ppropdefnode6 isa nullable PPropdef
+                                       var listnode7 = nodearraylist4
                                        assert listnode7 isa Array[Object]
                                        if ppropdefnode6 != null then
                                                listnode8.add(ppropdefnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
                                        var pclassdefnode9 = nodearraylist5
-                                       assert pclassdefnode9 isa PClassdef
-                                       if listnode4 != null then
+                                       assert pclassdefnode9 isa nullable PClassdef
+#                                      if listnode4 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode4
                                                else
                                                        listnode10.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode10.add(pclassdefnode5)
                                        end
                                        if pclassdefnode9 != null then
                                                listnode10.add(pclassdefnode9)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode3,
                                                listnode10
@@ -2677,9 +2690,9 @@ init do end
 end
 private class ReduceAction42
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -2688,34 +2701,34 @@ special ReduceAction
                                        var listnode3 = new Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode4 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
                                        var listnode7 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist3
-                                       assert ppropdefnode6 isa PPropdef
+                                       assert ppropdefnode6 isa nullable PPropdef
                                        if ppropdefnode6 != null then
                                                listnode7.add(ppropdefnode6)
                                        end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode7
                                        )
                                        var pclassdefnode8 = nodearraylist5
-                                       assert pclassdefnode8 isa PClassdef
-                                       if listnode4 != null then
+                                       assert pclassdefnode8 isa nullable PClassdef
+#                                      if listnode4 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode4
                                                else
                                                        listnode9.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode9.add(pclassdefnode5)
                                        end
                                        if pclassdefnode8 != null then
                                                listnode9.add(pclassdefnode8)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode9
@@ -2727,9 +2740,9 @@ init do end
 end
 private class ReduceAction43
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -2739,43 +2752,43 @@ special ReduceAction
                                        var listnode3 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode4 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode6 = nodearraylist3
-                                       assert ppropdefnode6 isa PPropdef
-                                       var listnode7 = nodearraylist5 
+                                       assert ppropdefnode6 isa nullable PPropdef
+                                       var listnode7 = nodearraylist5
                                        assert listnode7 isa Array[Object]
                                        if ppropdefnode6 != null then
                                                listnode8.add(ppropdefnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode5 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode5: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
                                        var pclassdefnode9 = nodearraylist6
-                                       assert pclassdefnode9 isa PClassdef
-                                       if listnode4 != null then
+                                       assert pclassdefnode9 isa nullable PClassdef
+#                                      if listnode4 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode4
                                                else
                                                        listnode10.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode5 != null then
                                                listnode10.add(pclassdefnode5)
                                        end
                                        if pclassdefnode9 != null then
                                                listnode10.add(pclassdefnode9)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode3,
                                                listnode10
@@ -2787,9 +2800,9 @@ init do end
 end
 private class ReduceAction44
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -2797,42 +2810,42 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode10 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist2 
+#                                      end
+                                       var listnode5 = nodearraylist2
                                        assert listnode5 isa Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode7 = nodearraylist3
-                                       assert ppropdefnode7 isa PPropdef
+                                       assert ppropdefnode7 isa nullable PPropdef
                                        if ppropdefnode7 != null then
                                                listnode8.add(ppropdefnode7)
                                        end
-                                       var pclassdefnode6 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode6: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
                                        var pclassdefnode9 = nodearraylist5
-                                       assert pclassdefnode9 isa PClassdef
-                                       if listnode5 != null then
+                                       assert pclassdefnode9 isa nullable PClassdef
+#                                      if listnode5 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode5
                                                else
                                                        listnode10.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode10.add(pclassdefnode6)
                                        end
                                        if pclassdefnode9 != null then
                                                listnode10.add(pclassdefnode9)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode10
@@ -2844,9 +2857,9 @@ init do end
 end
 private class ReduceAction45
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -2855,51 +2868,51 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode11 = new Array[Object]
-                                       var listnode3 = nodearraylist1 
+                                       var listnode3 = nodearraylist1
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist2 
+#                                      end
+                                       var listnode5 = nodearraylist2
                                        assert listnode5 isa Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppropdefnode7 = nodearraylist3
-                                       assert ppropdefnode7 isa PPropdef
-                                       var listnode8 = nodearraylist5 
+                                       assert ppropdefnode7 isa nullable PPropdef
+                                       var listnode8 = nodearraylist5
                                        assert listnode8 isa Array[Object]
                                        if ppropdefnode7 != null then
                                                listnode9.add(ppropdefnode7)
                                        end
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
-                                       var pclassdefnode6 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode6: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode9
                                        )
                                        var pclassdefnode10 = nodearraylist6
-                                       assert pclassdefnode10 isa PClassdef
-                                       if listnode5 != null then
+                                       assert pclassdefnode10 isa nullable PClassdef
+#                                      if listnode5 != null then
                                                if listnode11.is_empty then
                                                        listnode11 = listnode5
                                                else
                                                        listnode11.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode11.add(pclassdefnode6)
                                        end
                                        if pclassdefnode10 != null then
                                                listnode11.add(pclassdefnode10)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                null,
                                                listnode4,
                                                listnode11
@@ -2911,9 +2924,9 @@ init do end
 end
 private class ReduceAction46
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -2923,43 +2936,43 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist3 
+#                                      end
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
                                        var listnode8 = new Array[Object]
                                        var ppropdefnode7 = nodearraylist4
-                                       assert ppropdefnode7 isa PPropdef
+                                       assert ppropdefnode7 isa nullable PPropdef
                                        if ppropdefnode7 != null then
                                                listnode8.add(ppropdefnode7)
                                        end
-                                       var pclassdefnode6 = new ATopClassdef.init_atopclassdef(
+                                       var pclassdefnode6: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode8
                                        )
                                        var pclassdefnode9 = nodearraylist6
-                                       assert pclassdefnode9 isa PClassdef
-                                       if listnode5 != null then
+                                       assert pclassdefnode9 isa nullable PClassdef
+#                                      if listnode5 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode5
                                                else
                                                        listnode10.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode10.add(pclassdefnode6)
                                        end
                                        if pclassdefnode9 != null then
                                                listnode10.add(pclassdefnode9)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode10
@@ -2971,9 +2984,9 @@ init do end
 end
 private class ReduceAction47
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -2984,52 +2997,52 @@ special ReduceAction
                                        var listnode4 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var ppackagedeclnode2 = nodearraylist1
-                                       assert ppackagedeclnode2 isa PPackagedecl
-                                       var listnode3 = nodearraylist2 
+                                       assert ppackagedeclnode2 isa nullable PPackagedecl
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist3 
+#                                      end
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
                                        var listnode9 = new Array[Object]
                                        var ppropdefnode7 = nodearraylist4
-                                       assert ppropdefnode7 isa PPropdef
-                                       var listnode8 = nodearraylist6 
+                                       assert ppropdefnode7 isa nullable PPropdef
+                                       var listnode8 = nodearraylist6
                                        assert listnode8 isa Array[Object]
                                        if ppropdefnode7 != null then
                                                listnode9.add(ppropdefnode7)
                                        end
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
-                                       var pclassdefnode6 = new ATopClassdef.init_atopclassdef(
+#                                      end
+                                       var pclassdefnode6: nullable ATopClassdef = new ATopClassdef.init_atopclassdef(
                                                listnode9
                                        )
                                        var pclassdefnode10 = nodearraylist7
-                                       assert pclassdefnode10 isa PClassdef
-                                       if listnode5 != null then
+                                       assert pclassdefnode10 isa nullable PClassdef
+#                                      if listnode5 != null then
                                                if listnode11.is_empty then
                                                        listnode11 = listnode5
                                                else
                                                        listnode11.append(listnode5)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode6 != null then
                                                listnode11.add(pclassdefnode6)
                                        end
                                        if pclassdefnode10 != null then
                                                listnode11.add(pclassdefnode10)
                                        end
-                                       var pmodulenode1 = new AModule.init_amodule(
+                                       var pmodulenode1: nullable AModule = new AModule.init_amodule(
                                                ppackagedeclnode2,
                                                listnode4,
                                                listnode11
@@ -3041,21 +3054,21 @@ init do end
 end
 private class ReduceAction48
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwpackagenode3 = nodearraylist2
-                                       assert tkwpackagenode3 isa TKwpackage
+                                       assert tkwpackagenode3 isa nullable TKwpackage
                                        var tidnode4 = nodearraylist4
-                                       assert tidnode4 isa TId
-                                       var ppackagedeclnode1 = new APackagedecl.init_apackagedecl(
+                                       assert tidnode4 isa nullable TId
+                                       var ppackagedeclnode1: nullable APackagedecl = new APackagedecl.init_apackagedecl(
                                                pdocnode2,
                                                tkwpackagenode3,
                                                tidnode4
@@ -3067,9 +3080,9 @@ init do end
 end
 private class ReduceAction49
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -3077,12 +3090,12 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pvisibilitynode2 = nodearraylist2
-                                       assert pvisibilitynode2 isa PVisibility
+                                       assert pvisibilitynode2 isa nullable PVisibility
                                        var tkwimportnode3 = nodearraylist3
-                                       assert tkwimportnode3 isa TKwimport
+                                       assert tkwimportnode3 isa nullable TKwimport
                                        var tidnode4 = nodearraylist5
-                                       assert tidnode4 isa TId
-                                       var pimportnode1 = new AImport.init_aimport(
+                                       assert tidnode4 isa nullable TId
+                                       var pimportnode1: nullable AImport = new AImport.init_aimport(
                                                pvisibilitynode2,
                                                tkwimportnode3,
                                                tidnode4
@@ -3094,9 +3107,9 @@ init do end
 end
 private class ReduceAction50
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -3104,12 +3117,12 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pvisibilitynode2 = nodearraylist2
-                                       assert pvisibilitynode2 isa PVisibility
+                                       assert pvisibilitynode2 isa nullable PVisibility
                                        var tkwimportnode3 = nodearraylist3
-                                       assert tkwimportnode3 isa TKwimport
+                                       assert tkwimportnode3 isa nullable TKwimport
                                        var tkwendnode4 = nodearraylist5
-                                       assert tkwendnode4 isa TKwend
-                                       var pimportnode1 = new ANoImport.init_anoimport(
+                                       assert tkwendnode4 isa nullable TKwend
+                                       var pimportnode1: nullable ANoImport = new ANoImport.init_anoimport(
                                                pvisibilitynode2,
                                                tkwimportnode3,
                                                tkwendnode4
@@ -3121,17 +3134,17 @@ init do end
 end
 private class ReduceAction51
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var ppropdefnode2 = nodearraylist1
-                                       assert ppropdefnode2 isa PPropdef
+                                       assert ppropdefnode2 isa nullable PPropdef
                                        if ppropdefnode2 != null then
                                                listnode3.add(ppropdefnode2)
                                        end
-                                       var pclassdefnode1 = new AMainClassdef.init_amainclassdef(
+                                       var pclassdefnode1: nullable AMainClassdef = new AMainClassdef.init_amainclassdef(
                                                listnode3
                                        )
                                        node_list = pclassdefnode1
@@ -3141,9 +3154,9 @@ init do end
 end
 private class ReduceAction52
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        node_list = null
                                        p.push(p.go_to(3), node_list)
@@ -3152,22 +3165,22 @@ init do end
 end
 private class ReduceAction53
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode4 = nodearraylist2
-                                       assert pexprnode4 isa PExpr
+                                       assert pexprnode4 isa nullable PExpr
                                        if pexprnode4 != null then
                                                listnode5.add(pexprnode4)
                                        end
-                                       var pexprnode3 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode3: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode5
                                        )
-                                       var ppropdefnode1 = new AMainMethPropdef.init_amainmethpropdef(
+                                       var ppropdefnode1: nullable AMainMethPropdef = new AMainMethPropdef.init_amainmethpropdef(
                                                null,
                                                pexprnode3
                                        )
@@ -3178,32 +3191,32 @@ init do end
 end
 private class ReduceAction54
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var pexprnode4 = nodearraylist2
-                                       assert pexprnode4 isa PExpr
-                                       var listnode5 = nodearraylist3 
+                                       assert pexprnode4 isa nullable PExpr
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
                                        if pexprnode4 != null then
                                                listnode6.add(pexprnode4)
                                        end
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode3 = new ABlockExpr.init_ablockexpr(
+#                                      end
+                                       var pexprnode3: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode6
                                        )
-                                       var ppropdefnode1 = new AMainMethPropdef.init_amainmethpropdef(
+                                       var ppropdefnode1: nullable AMainMethPropdef = new AMainMethPropdef.init_amainmethpropdef(
                                                null,
                                                pexprnode3
                                        )
@@ -3214,9 +3227,9 @@ init do end
 end
 private class ReduceAction55
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -3228,14 +3241,14 @@ special ReduceAction
                                        var listnode8 = new Array[Object]
                                        var listnode9 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -3252,9 +3265,9 @@ init do end
 end
 private class ReduceAction56
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -3267,16 +3280,16 @@ special ReduceAction
                                        var listnode8 = new Array[Object]
                                        var listnode9 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -3293,9 +3306,9 @@ init do end
 end
 private class ReduceAction57
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -3308,23 +3321,23 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist6
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -3341,9 +3354,9 @@ init do end
 end
 private class ReduceAction58
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -3357,25 +3370,25 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist7
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -3392,9 +3405,9 @@ init do end
 end
 private class ReduceAction59
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -3407,23 +3420,23 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode8 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode8 = nodearraylist6
                                        assert listnode8 isa Array[Object]
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -3440,9 +3453,9 @@ init do end
 end
 private class ReduceAction60
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -3456,25 +3469,25 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode8 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode8 = nodearraylist7
                                        assert listnode8 isa Array[Object]
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -3491,9 +3504,9 @@ init do end
 end
 private class ReduceAction61
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -3507,32 +3520,32 @@ special ReduceAction
                                        var listnode10 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist6
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var listnode9 = nodearraylist7 
+#                                      end
+                                       var listnode9 = nodearraylist7
                                        assert listnode9 isa Array[Object]
-                                       if listnode9 != null then
+#                                      if listnode9 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode9
                                                else
                                                        listnode10.append(listnode9)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -3549,9 +3562,9 @@ init do end
 end
 private class ReduceAction62
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -3566,34 +3579,34 @@ special ReduceAction
                                        var listnode10 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist7
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var listnode9 = nodearraylist8 
+#                                      end
+                                       var listnode9 = nodearraylist8
                                        assert listnode9 isa Array[Object]
-                                       if listnode9 != null then
+#                                      if listnode9 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode9
                                                else
                                                        listnode10.append(listnode9)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -3610,9 +3623,9 @@ init do end
 end
 private class ReduceAction63
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -3626,19 +3639,19 @@ special ReduceAction
                                        var listnode8 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
+                                       assert tclassidnode6 isa nullable TClassid
                                        var ppropdefnode9 = nodearraylist6
-                                       assert ppropdefnode9 isa PPropdef
+                                       assert ppropdefnode9 isa nullable PPropdef
                                        if ppropdefnode9 != null then
                                                listnode10.add(ppropdefnode9)
                                        end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -3655,9 +3668,9 @@ init do end
 end
 private class ReduceAction64
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -3672,28 +3685,28 @@ special ReduceAction
                                        var listnode8 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
+                                       assert tclassidnode6 isa nullable TClassid
                                        var ppropdefnode9 = nodearraylist6
-                                       assert ppropdefnode9 isa PPropdef
-                                       var listnode10 = nodearraylist8 
+                                       assert ppropdefnode9 isa nullable PPropdef
+                                       var listnode10 = nodearraylist8
                                        assert listnode10 isa Array[Object]
                                        if ppropdefnode9 != null then
                                                listnode11.add(ppropdefnode9)
                                        end
-                                       if listnode10 != null then
+#                                      if listnode10 != null then
                                                if listnode11.is_empty then
                                                        listnode11 = listnode10
                                                else
                                                        listnode11.append(listnode10)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -3710,9 +3723,9 @@ init do end
 end
 private class ReduceAction65
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -3727,21 +3740,21 @@ special ReduceAction
                                        var listnode8 = new Array[Object]
                                        var listnode10 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
+                                       assert tclassidnode6 isa nullable TClassid
                                        var ppropdefnode9 = nodearraylist7
-                                       assert ppropdefnode9 isa PPropdef
+                                       assert ppropdefnode9 isa nullable PPropdef
                                        if ppropdefnode9 != null then
                                                listnode10.add(ppropdefnode9)
                                        end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -3758,9 +3771,9 @@ init do end
 end
 private class ReduceAction66
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -3776,30 +3789,30 @@ special ReduceAction
                                        var listnode8 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
+                                       assert tclassidnode6 isa nullable TClassid
                                        var ppropdefnode9 = nodearraylist7
-                                       assert ppropdefnode9 isa PPropdef
-                                       var listnode10 = nodearraylist9 
+                                       assert ppropdefnode9 isa nullable PPropdef
+                                       var listnode10 = nodearraylist9
                                        assert listnode10 isa Array[Object]
                                        if ppropdefnode9 != null then
                                                listnode11.add(ppropdefnode9)
                                        end
-                                       if listnode10 != null then
+#                                      if listnode10 != null then
                                                if listnode11.is_empty then
                                                        listnode11 = listnode10
                                                else
                                                        listnode11.append(listnode10)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -3816,9 +3829,9 @@ init do end
 end
 private class ReduceAction67
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -3833,28 +3846,28 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist6
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode10 = nodearraylist7
-                                       assert ppropdefnode10 isa PPropdef
+                                       assert ppropdefnode10 isa nullable PPropdef
                                        if ppropdefnode10 != null then
                                                listnode11.add(ppropdefnode10)
                                        end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -3871,9 +3884,9 @@ init do end
 end
 private class ReduceAction68
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -3889,37 +3902,37 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode12 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist6
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode10 = nodearraylist7
-                                       assert ppropdefnode10 isa PPropdef
-                                       var listnode11 = nodearraylist9 
+                                       assert ppropdefnode10 isa nullable PPropdef
+                                       var listnode11 = nodearraylist9
                                        assert listnode11 isa Array[Object]
                                        if ppropdefnode10 != null then
                                                listnode12.add(ppropdefnode10)
                                        end
-                                       if listnode11 != null then
+#                                      if listnode11 != null then
                                                if listnode12.is_empty then
                                                        listnode12 = listnode11
                                                else
                                                        listnode12.append(listnode11)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -3936,9 +3949,9 @@ init do end
 end
 private class ReduceAction69
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -3954,30 +3967,30 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist7
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode10 = nodearraylist8
-                                       assert ppropdefnode10 isa PPropdef
+                                       assert ppropdefnode10 isa nullable PPropdef
                                        if ppropdefnode10 != null then
                                                listnode11.add(ppropdefnode10)
                                        end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -3994,9 +4007,9 @@ init do end
 end
 private class ReduceAction70
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -4013,39 +4026,39 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode12 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist7
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode10 = nodearraylist8
-                                       assert ppropdefnode10 isa PPropdef
-                                       var listnode11 = nodearraylist10 
+                                       assert ppropdefnode10 isa nullable PPropdef
+                                       var listnode11 = nodearraylist10
                                        assert listnode11 isa Array[Object]
                                        if ppropdefnode10 != null then
                                                listnode12.add(ppropdefnode10)
                                        end
-                                       if listnode11 != null then
+#                                      if listnode11 != null then
                                                if listnode12.is_empty then
                                                        listnode12 = listnode11
                                                else
                                                        listnode12.append(listnode11)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -4062,9 +4075,9 @@ init do end
 end
 private class ReduceAction71
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -4079,28 +4092,28 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode8 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode8 = nodearraylist6
                                        assert listnode8 isa Array[Object]
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode10 = nodearraylist7
-                                       assert ppropdefnode10 isa PPropdef
+                                       assert ppropdefnode10 isa nullable PPropdef
                                        if ppropdefnode10 != null then
                                                listnode11.add(ppropdefnode10)
                                        end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -4117,9 +4130,9 @@ init do end
 end
 private class ReduceAction72
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -4135,37 +4148,37 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode12 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode8 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode8 = nodearraylist6
                                        assert listnode8 isa Array[Object]
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode10 = nodearraylist7
-                                       assert ppropdefnode10 isa PPropdef
-                                       var listnode11 = nodearraylist9 
+                                       assert ppropdefnode10 isa nullable PPropdef
+                                       var listnode11 = nodearraylist9
                                        assert listnode11 isa Array[Object]
                                        if ppropdefnode10 != null then
                                                listnode12.add(ppropdefnode10)
                                        end
-                                       if listnode11 != null then
+#                                      if listnode11 != null then
                                                if listnode12.is_empty then
                                                        listnode12 = listnode11
                                                else
                                                        listnode12.append(listnode11)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -4182,9 +4195,9 @@ init do end
 end
 private class ReduceAction73
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -4200,30 +4213,30 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode11 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode8 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode8 = nodearraylist7
                                        assert listnode8 isa Array[Object]
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode10 = nodearraylist8
-                                       assert ppropdefnode10 isa PPropdef
+                                       assert ppropdefnode10 isa nullable PPropdef
                                        if ppropdefnode10 != null then
                                                listnode11.add(ppropdefnode10)
                                        end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -4240,9 +4253,9 @@ init do end
 end
 private class ReduceAction74
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -4259,39 +4272,39 @@ special ReduceAction
                                        var listnode9 = new Array[Object]
                                        var listnode12 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode8 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode8 = nodearraylist7
                                        assert listnode8 isa Array[Object]
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode10 = nodearraylist8
-                                       assert ppropdefnode10 isa PPropdef
-                                       var listnode11 = nodearraylist10 
+                                       assert ppropdefnode10 isa nullable PPropdef
+                                       var listnode11 = nodearraylist10
                                        assert listnode11 isa Array[Object]
                                        if ppropdefnode10 != null then
                                                listnode12.add(ppropdefnode10)
                                        end
-                                       if listnode11 != null then
+#                                      if listnode11 != null then
                                                if listnode12.is_empty then
                                                        listnode12 = listnode11
                                                else
                                                        listnode12.append(listnode11)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -4308,9 +4321,9 @@ init do end
 end
 private class ReduceAction75
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -4326,37 +4339,37 @@ special ReduceAction
                                        var listnode10 = new Array[Object]
                                        var listnode12 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist6
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var listnode9 = nodearraylist7 
+#                                      end
+                                       var listnode9 = nodearraylist7
                                        assert listnode9 isa Array[Object]
-                                       if listnode9 != null then
+#                                      if listnode9 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode9
                                                else
                                                        listnode10.append(listnode9)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode11 = nodearraylist8
-                                       assert ppropdefnode11 isa PPropdef
+                                       assert ppropdefnode11 isa nullable PPropdef
                                        if ppropdefnode11 != null then
                                                listnode12.add(ppropdefnode11)
                                        end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -4373,9 +4386,9 @@ init do end
 end
 private class ReduceAction76
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -4392,46 +4405,46 @@ special ReduceAction
                                        var listnode10 = new Array[Object]
                                        var listnode13 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist3
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist6 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist6
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var listnode9 = nodearraylist7 
+#                                      end
+                                       var listnode9 = nodearraylist7
                                        assert listnode9 isa Array[Object]
-                                       if listnode9 != null then
+#                                      if listnode9 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode9
                                                else
                                                        listnode10.append(listnode9)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode11 = nodearraylist8
-                                       assert ppropdefnode11 isa PPropdef
-                                       var listnode12 = nodearraylist10 
+                                       assert ppropdefnode11 isa nullable PPropdef
+                                       var listnode12 = nodearraylist10
                                        assert listnode12 isa Array[Object]
                                        if ppropdefnode11 != null then
                                                listnode13.add(ppropdefnode11)
                                        end
-                                       if listnode12 != null then
+#                                      if listnode12 != null then
                                                if listnode13.is_empty then
                                                        listnode13 = listnode12
                                                else
                                                        listnode13.append(listnode12)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -4448,9 +4461,9 @@ init do end
 end
 private class ReduceAction77
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -4467,39 +4480,39 @@ special ReduceAction
                                        var listnode10 = new Array[Object]
                                        var listnode12 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist7
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var listnode9 = nodearraylist8 
+#                                      end
+                                       var listnode9 = nodearraylist8
                                        assert listnode9 isa Array[Object]
-                                       if listnode9 != null then
+#                                      if listnode9 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode9
                                                else
                                                        listnode10.append(listnode9)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode11 = nodearraylist9
-                                       assert ppropdefnode11 isa PPropdef
+                                       assert ppropdefnode11 isa nullable PPropdef
                                        if ppropdefnode11 != null then
                                                listnode12.add(ppropdefnode11)
                                        end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -4516,9 +4529,9 @@ init do end
 end
 private class ReduceAction78
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist13 = p.pop
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
@@ -4536,48 +4549,48 @@ special ReduceAction
                                        var listnode10 = new Array[Object]
                                        var listnode13 = new Array[Object]
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var pclasskindnode5 = nodearraylist4
-                                       assert pclasskindnode5 isa PClasskind
+                                       assert pclasskindnode5 isa nullable PClasskind
                                        var tclassidnode6 = nodearraylist6
-                                       assert tclassidnode6 isa TClassid
-                                       var listnode7 = nodearraylist7 
+                                       assert tclassidnode6 isa nullable TClassid
+                                       var listnode7 = nodearraylist7
                                        assert listnode7 isa Array[Object]
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var listnode9 = nodearraylist8 
+#                                      end
+                                       var listnode9 = nodearraylist8
                                        assert listnode9 isa Array[Object]
-                                       if listnode9 != null then
+#                                      if listnode9 != null then
                                                if listnode10.is_empty then
                                                        listnode10 = listnode9
                                                else
                                                        listnode10.append(listnode9)
                                                end
-                                       end
+#                                      end
                                        var ppropdefnode11 = nodearraylist9
-                                       assert ppropdefnode11 isa PPropdef
-                                       var listnode12 = nodearraylist11 
+                                       assert ppropdefnode11 isa nullable PPropdef
+                                       var listnode12 = nodearraylist11
                                        assert listnode12 isa Array[Object]
                                        if ppropdefnode11 != null then
                                                listnode13.add(ppropdefnode11)
                                        end
-                                       if listnode12 != null then
+#                                      if listnode12 != null then
                                                if listnode13.is_empty then
                                                        listnode13 = listnode12
                                                else
                                                        listnode13.append(listnode12)
                                                end
-                                       end
-                                       var pclassdefnode1 = new AClassdef.init_aclassdef(
+#                                      end
+                                       var pclassdefnode1: nullable AClassdef = new AClassdef.init_aclassdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -4594,13 +4607,13 @@ init do end
 end
 private class ReduceAction79
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwclassnode2 = nodearraylist1
-                                       assert tkwclassnode2 isa TKwclass
-                                       var pclasskindnode1 = new AConcreteClasskind.init_aconcreteclasskind(
+                                       assert tkwclassnode2 isa nullable TKwclass
+                                       var pclasskindnode1: nullable AConcreteClasskind = new AConcreteClasskind.init_aconcreteclasskind(
                                                tkwclassnode2
                                        )
                                        node_list = pclasskindnode1
@@ -4610,16 +4623,16 @@ init do end
 end
 private class ReduceAction80
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwabstractnode2 = nodearraylist1
-                                       assert tkwabstractnode2 isa TKwabstract
+                                       assert tkwabstractnode2 isa nullable TKwabstract
                                        var tkwclassnode3 = nodearraylist2
-                                       assert tkwclassnode3 isa TKwclass
-                                       var pclasskindnode1 = new AAbstractClasskind.init_aabstractclasskind(
+                                       assert tkwclassnode3 isa nullable TKwclass
+                                       var pclasskindnode1: nullable AAbstractClasskind = new AAbstractClasskind.init_aabstractclasskind(
                                                tkwabstractnode2,
                                                tkwclassnode3
                                        )
@@ -4630,13 +4643,13 @@ init do end
 end
 private class ReduceAction81
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwinterfacenode2 = nodearraylist1
-                                       assert tkwinterfacenode2 isa TKwinterface
-                                       var pclasskindnode1 = new AInterfaceClasskind.init_ainterfaceclasskind(
+                                       assert tkwinterfacenode2 isa nullable TKwinterface
+                                       var pclasskindnode1: nullable AInterfaceClasskind = new AInterfaceClasskind.init_ainterfaceclasskind(
                                                tkwinterfacenode2
                                        )
                                        node_list = pclasskindnode1
@@ -4646,13 +4659,13 @@ init do end
 end
 private class ReduceAction82
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwuniversalnode2 = nodearraylist1
-                                       assert tkwuniversalnode2 isa TKwuniversal
-                                       var pclasskindnode1 = new AUniversalClasskind.init_auniversalclasskind(
+                                       assert tkwuniversalnode2 isa nullable TKwuniversal
+                                       var pclasskindnode1: nullable AUniversalClasskind = new AUniversalClasskind.init_auniversalclasskind(
                                                tkwuniversalnode2
                                        )
                                        node_list = pclasskindnode1
@@ -4662,9 +4675,9 @@ init do end
 end
 private class ReduceAction83
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -4672,7 +4685,7 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pformaldefnode1 = nodearraylist3
-                                       assert pformaldefnode1 isa PFormaldef
+                                       assert pformaldefnode1 isa nullable PFormaldef
                                        if pformaldefnode1 != null then
                                                listnode2.add(pformaldefnode1)
                                        end
@@ -4683,9 +4696,9 @@ init do end
 end
 private class ReduceAction84
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -4694,19 +4707,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pformaldefnode1 = nodearraylist3
-                                       assert pformaldefnode1 isa PFormaldef
-                                       var listnode2 = nodearraylist4 
+                                       assert pformaldefnode1 isa nullable PFormaldef
+                                       var listnode2 = nodearraylist4
                                        assert listnode2 isa Array[Object]
                                        if pformaldefnode1 != null then
                                                listnode3.add(pformaldefnode1)
                                        end
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(7), node_list)
        end
@@ -4714,14 +4727,14 @@ init do end
 end
 private class ReduceAction85
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pformaldefnode1 = nodearraylist3
-                                       assert pformaldefnode1 isa PFormaldef
+                                       assert pformaldefnode1 isa nullable PFormaldef
                                        node_list = pformaldefnode1
                                        p.push(p.go_to(8), node_list)
        end
@@ -4729,13 +4742,13 @@ init do end
 end
 private class ReduceAction86
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tclassidnode2 = nodearraylist1
-                                       assert tclassidnode2 isa TClassid
-                                       var pformaldefnode1 = new AFormaldef.init_aformaldef(
+                                       assert tclassidnode2 isa nullable TClassid
+                                       var pformaldefnode1: nullable AFormaldef = new AFormaldef.init_aformaldef(
                                                tclassidnode2,
                                                null
                                        )
@@ -4746,16 +4759,16 @@ init do end
 end
 private class ReduceAction87
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tclassidnode2 = nodearraylist1
-                                       assert tclassidnode2 isa TClassid
+                                       assert tclassidnode2 isa nullable TClassid
                                        var ptypenode3 = nodearraylist2
-                                       assert ptypenode3 isa PType
-                                       var pformaldefnode1 = new AFormaldef.init_aformaldef(
+                                       assert ptypenode3 isa nullable PType
+                                       var pformaldefnode1: nullable AFormaldef = new AFormaldef.init_aformaldef(
                                                tclassidnode2,
                                                ptypenode3
                                        )
@@ -4766,18 +4779,18 @@ init do end
 end
 private class ReduceAction88
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwspecialnode2 = nodearraylist2
-                                       assert tkwspecialnode2 isa TKwspecial
+                                       assert tkwspecialnode2 isa nullable TKwspecial
                                        var ptypenode3 = nodearraylist4
-                                       assert ptypenode3 isa PType
-                                       var psuperclassnode1 = new ASuperclass.init_asuperclass(
+                                       assert ptypenode3 isa nullable PType
+                                       var psuperclassnode1: nullable ASuperclass = new ASuperclass.init_asuperclass(
                                                tkwspecialnode2,
                                                ptypenode3
                                        )
@@ -4788,13 +4801,13 @@ init do end
 end
 private class ReduceAction89
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var ppropdefnode1 = nodearraylist1
-                                       assert ppropdefnode1 isa PPropdef
+                                       assert ppropdefnode1 isa nullable PPropdef
                                        node_list = ppropdefnode1
                                        p.push(p.go_to(11), node_list)
        end
@@ -4802,9 +4815,9 @@ init do end
 end
 private class ReduceAction90
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -4813,18 +4826,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist7
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteMethPropdef.init_aconcretemethpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteMethPropdef = new AConcreteMethPropdef.init_aconcretemethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -4840,9 +4853,9 @@ init do end
 end
 private class ReduceAction91
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -4852,20 +4865,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist8
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteMethPropdef.init_aconcretemethpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteMethPropdef = new AConcreteMethPropdef.init_aconcretemethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -4881,9 +4894,9 @@ init do end
 end
 private class ReduceAction92
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -4893,18 +4906,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist7
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteMethPropdef.init_aconcretemethpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteMethPropdef = new AConcreteMethPropdef.init_aconcretemethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -4920,9 +4933,9 @@ init do end
 end
 private class ReduceAction93
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -4933,20 +4946,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist8
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteMethPropdef.init_aconcretemethpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteMethPropdef = new AConcreteMethPropdef.init_aconcretemethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -4962,9 +4975,9 @@ init do end
 end
 private class ReduceAction94
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -4973,16 +4986,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
-                                       var ppropdefnode1 = new ADeferredMethPropdef.init_adeferredmethpropdef(
+                                       assert psignaturenode7 isa nullable PSignature
+                                       var ppropdefnode1: nullable ADeferredMethPropdef = new ADeferredMethPropdef.init_adeferredmethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -4997,9 +5010,9 @@ init do end
 end
 private class ReduceAction95
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -5009,18 +5022,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
-                                       var ppropdefnode1 = new ADeferredMethPropdef.init_adeferredmethpropdef(
+                                       assert psignaturenode7 isa nullable PSignature
+                                       var ppropdefnode1: nullable ADeferredMethPropdef = new ADeferredMethPropdef.init_adeferredmethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -5035,9 +5048,9 @@ init do end
 end
 private class ReduceAction96
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -5046,16 +5059,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
-                                       var ppropdefnode1 = new AInternMethPropdef.init_ainternmethpropdef(
+                                       assert psignaturenode7 isa nullable PSignature
+                                       var ppropdefnode1: nullable AInternMethPropdef = new AInternMethPropdef.init_ainternmethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -5070,9 +5083,9 @@ init do end
 end
 private class ReduceAction97
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -5082,18 +5095,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
-                                       var ppropdefnode1 = new AInternMethPropdef.init_ainternmethpropdef(
+                                       assert psignaturenode7 isa nullable PSignature
+                                       var ppropdefnode1: nullable AInternMethPropdef = new AInternMethPropdef.init_ainternmethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -5108,9 +5121,9 @@ init do end
 end
 private class ReduceAction98
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -5119,16 +5132,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
-                                       var ppropdefnode1 = new AExternMethPropdef.init_aexternmethpropdef(
+                                       assert psignaturenode7 isa nullable PSignature
+                                       var ppropdefnode1: nullable AExternMethPropdef = new AExternMethPropdef.init_aexternmethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -5144,9 +5157,9 @@ init do end
 end
 private class ReduceAction99
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -5156,18 +5169,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
-                                       var ppropdefnode1 = new AExternMethPropdef.init_aexternmethpropdef(
+                                       assert psignaturenode7 isa nullable PSignature
+                                       var ppropdefnode1: nullable AExternMethPropdef = new AExternMethPropdef.init_aexternmethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -5183,9 +5196,9 @@ init do end
 end
 private class ReduceAction100
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -5195,18 +5208,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var tstringnode8 = nodearraylist8
-                                       assert tstringnode8 isa TString
-                                       var ppropdefnode1 = new AExternMethPropdef.init_aexternmethpropdef(
+                                       assert tstringnode8 isa nullable TString
+                                       var ppropdefnode1: nullable AExternMethPropdef = new AExternMethPropdef.init_aexternmethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -5222,9 +5235,9 @@ init do end
 end
 private class ReduceAction101
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -5235,20 +5248,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var tstringnode8 = nodearraylist9
-                                       assert tstringnode8 isa TString
-                                       var ppropdefnode1 = new AExternMethPropdef.init_aexternmethpropdef(
+                                       assert tstringnode8 isa nullable TString
+                                       var ppropdefnode1: nullable AExternMethPropdef = new AExternMethPropdef.init_aexternmethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -5264,9 +5277,9 @@ init do end
 end
 private class ReduceAction102
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -5274,26 +5287,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist4
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist5
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist6
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -5312,9 +5325,9 @@ init do end
 end
 private class ReduceAction103
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -5323,28 +5336,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -5363,29 +5376,29 @@ init do end
 end
 private class ReduceAction104
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist4
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -5404,9 +5417,9 @@ init do end
 end
 private class ReduceAction105
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -5415,28 +5428,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -5455,9 +5468,9 @@ init do end
 end
 private class ReduceAction106
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -5467,30 +5480,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -5509,9 +5522,9 @@ init do end
 end
 private class ReduceAction107
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -5519,22 +5532,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -5553,29 +5566,29 @@ init do end
 end
 private class ReduceAction108
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist4
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -5594,9 +5607,9 @@ init do end
 end
 private class ReduceAction109
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -5604,22 +5617,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -5638,22 +5651,22 @@ init do end
 end
 private class ReduceAction110
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode6 = nodearraylist2
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwattrnode7 = nodearraylist3
-                                       assert tkwattrnode7 isa TKwattr
+                                       assert tkwattrnode7 isa nullable TKwattr
                                        var tattridnode9 = nodearraylist4
-                                       assert tattridnode9 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode9 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -5672,9 +5685,9 @@ init do end
 end
 private class ReduceAction111
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -5683,28 +5696,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist4
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -5723,9 +5736,9 @@ init do end
 end
 private class ReduceAction112
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -5735,30 +5748,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -5777,9 +5790,9 @@ init do end
 end
 private class ReduceAction113
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -5787,22 +5800,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -5821,9 +5834,9 @@ init do end
 end
 private class ReduceAction114
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -5833,30 +5846,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -5875,9 +5888,9 @@ init do end
 end
 private class ReduceAction115
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -5888,32 +5901,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist6
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist7
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist8
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist9
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -5932,9 +5945,9 @@ init do end
 end
 private class ReduceAction116
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -5943,24 +5956,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist6
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -5979,9 +5992,9 @@ init do end
 end
 private class ReduceAction117
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -5989,22 +6002,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -6023,9 +6036,9 @@ init do end
 end
 private class ReduceAction118
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -6034,24 +6047,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist6
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -6070,25 +6083,25 @@ init do end
 end
 private class ReduceAction119
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var pvisibilitynode6 = nodearraylist3
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwattrnode7 = nodearraylist4
-                                       assert tkwattrnode7 isa TKwattr
+                                       assert tkwattrnode7 isa nullable TKwattr
                                        var tattridnode9 = nodearraylist5
-                                       assert tattridnode9 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode9 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -6107,9 +6120,9 @@ init do end
 end
 private class ReduceAction120
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -6118,28 +6131,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist4
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist5
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist6
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist7
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -6158,9 +6171,9 @@ init do end
 end
 private class ReduceAction121
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -6170,30 +6183,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -6212,9 +6225,9 @@ init do end
 end
 private class ReduceAction122
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -6222,22 +6235,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist4
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist6
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -6256,9 +6269,9 @@ init do end
 end
 private class ReduceAction123
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -6268,30 +6281,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -6310,9 +6323,9 @@ init do end
 end
 private class ReduceAction124
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -6323,32 +6336,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -6367,9 +6380,9 @@ init do end
 end
 private class ReduceAction125
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -6378,24 +6391,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -6414,9 +6427,9 @@ init do end
 end
 private class ReduceAction126
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -6424,22 +6437,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist4
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist6
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -6458,9 +6471,9 @@ init do end
 end
 private class ReduceAction127
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -6469,24 +6482,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -6505,25 +6518,25 @@ init do end
 end
 private class ReduceAction128
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode6 = nodearraylist2
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwattrnode7 = nodearraylist3
-                                       assert tkwattrnode7 isa TKwattr
+                                       assert tkwattrnode7 isa nullable TKwattr
                                        var tattridnode9 = nodearraylist4
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var ptypenode10 = nodearraylist5
-                                       assert ptypenode10 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode10 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -6542,9 +6555,9 @@ init do end
 end
 private class ReduceAction129
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -6554,30 +6567,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist4
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -6596,9 +6609,9 @@ init do end
 end
 private class ReduceAction130
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -6609,32 +6622,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -6653,9 +6666,9 @@ init do end
 end
 private class ReduceAction131
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -6664,24 +6677,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -6700,9 +6713,9 @@ init do end
 end
 private class ReduceAction132
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -6713,32 +6726,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -6757,9 +6770,9 @@ init do end
 end
 private class ReduceAction133
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -6771,34 +6784,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist6
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist7
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist8
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist9
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist10
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -6817,9 +6830,9 @@ init do end
 end
 private class ReduceAction134
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -6829,26 +6842,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist6
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist8
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -6867,9 +6880,9 @@ init do end
 end
 private class ReduceAction135
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -6878,24 +6891,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -6914,9 +6927,9 @@ init do end
 end
 private class ReduceAction136
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -6926,26 +6939,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist6
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist8
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -6964,9 +6977,9 @@ init do end
 end
 private class ReduceAction137
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -6974,18 +6987,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var pvisibilitynode6 = nodearraylist3
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwattrnode7 = nodearraylist4
-                                       assert tkwattrnode7 isa TKwattr
+                                       assert tkwattrnode7 isa nullable TKwattr
                                        var tattridnode9 = nodearraylist5
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var ptypenode10 = nodearraylist6
-                                       assert ptypenode10 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode10 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -7004,9 +7017,9 @@ init do end
 end
 private class ReduceAction138
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -7017,28 +7030,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist4
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist5
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist6
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist9
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7057,9 +7070,9 @@ init do end
 end
 private class ReduceAction139
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -7071,30 +7084,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist10
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7113,9 +7126,9 @@ init do end
 end
 private class ReduceAction140
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -7125,22 +7138,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist4
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist8
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -7159,9 +7172,9 @@ init do end
 end
 private class ReduceAction141
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -7173,30 +7186,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist10
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7215,9 +7228,9 @@ init do end
 end
 private class ReduceAction142
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -7230,32 +7243,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7274,9 +7287,9 @@ init do end
 end
 private class ReduceAction143
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -7287,24 +7300,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -7323,9 +7336,9 @@ init do end
 end
 private class ReduceAction144
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -7335,22 +7348,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist4
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist8
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -7369,9 +7382,9 @@ init do end
 end
 private class ReduceAction145
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -7382,24 +7395,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -7418,9 +7431,9 @@ init do end
 end
 private class ReduceAction146
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -7429,16 +7442,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode6 = nodearraylist2
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwattrnode7 = nodearraylist3
-                                       assert tkwattrnode7 isa TKwattr
+                                       assert tkwattrnode7 isa nullable TKwattr
                                        var tattridnode9 = nodearraylist4
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var pexprnode11 = nodearraylist7
-                                       assert pexprnode11 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode11 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -7457,9 +7470,9 @@ init do end
 end
 private class ReduceAction147
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -7471,30 +7484,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist4
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist10
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7513,9 +7526,9 @@ init do end
 end
 private class ReduceAction148
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -7528,32 +7541,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7572,9 +7585,9 @@ init do end
 end
 private class ReduceAction149
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -7585,24 +7598,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -7621,9 +7634,9 @@ init do end
 end
 private class ReduceAction150
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -7636,32 +7649,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7680,9 +7693,9 @@ init do end
 end
 private class ReduceAction151
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -7696,34 +7709,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist6
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist7
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist8
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist9
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist12
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7742,9 +7755,9 @@ init do end
 end
 private class ReduceAction152
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -7756,26 +7769,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist6
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -7794,9 +7807,9 @@ init do end
 end
 private class ReduceAction153
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -7807,24 +7820,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -7843,9 +7856,9 @@ init do end
 end
 private class ReduceAction154
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -7857,26 +7870,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist6
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -7895,9 +7908,9 @@ init do end
 end
 private class ReduceAction155
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -7907,18 +7920,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var pvisibilitynode6 = nodearraylist3
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwattrnode7 = nodearraylist4
-                                       assert tkwattrnode7 isa TKwattr
+                                       assert tkwattrnode7 isa nullable TKwattr
                                        var tattridnode9 = nodearraylist5
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var pexprnode11 = nodearraylist8
-                                       assert pexprnode11 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode11 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -7937,9 +7950,9 @@ init do end
 end
 private class ReduceAction156
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -7951,30 +7964,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist4
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist5
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist6
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist7
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist10
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -7993,9 +8006,9 @@ init do end
 end
 private class ReduceAction157
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -8008,32 +8021,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -8052,9 +8065,9 @@ init do end
 end
 private class ReduceAction158
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -8065,24 +8078,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist4
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist6
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -8101,9 +8114,9 @@ init do end
 end
 private class ReduceAction159
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -8116,32 +8129,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -8160,9 +8173,9 @@ init do end
 end
 private class ReduceAction160
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -8176,34 +8189,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist12
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -8222,9 +8235,9 @@ init do end
 end
 private class ReduceAction161
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -8236,26 +8249,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -8274,9 +8287,9 @@ init do end
 end
 private class ReduceAction162
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -8287,24 +8300,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist4
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist6
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -8323,9 +8336,9 @@ init do end
 end
 private class ReduceAction163
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -8337,26 +8350,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -8375,9 +8388,9 @@ init do end
 end
 private class ReduceAction164
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -8387,18 +8400,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode6 = nodearraylist2
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwattrnode7 = nodearraylist3
-                                       assert tkwattrnode7 isa TKwattr
+                                       assert tkwattrnode7 isa nullable TKwattr
                                        var tattridnode9 = nodearraylist4
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var ptypenode10 = nodearraylist5
-                                       assert ptypenode10 isa PType
+                                       assert ptypenode10 isa nullable PType
                                        var pexprnode11 = nodearraylist8
-                                       assert pexprnode11 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode11 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -8417,9 +8430,9 @@ init do end
 end
 private class ReduceAction165
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -8432,32 +8445,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist4
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist6
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -8476,9 +8489,9 @@ init do end
 end
 private class ReduceAction166
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -8492,34 +8505,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist12
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -8538,9 +8551,9 @@ init do end
 end
 private class ReduceAction167
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -8552,26 +8565,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -8590,9 +8603,9 @@ init do end
 end
 private class ReduceAction168
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -8606,34 +8619,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist7
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist12
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -8652,9 +8665,9 @@ init do end
 end
 private class ReduceAction169
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist13 = p.pop
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
@@ -8669,36 +8682,36 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist6
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist7
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwattrnode11 = nodearraylist8
-                                       assert tkwattrnode11 isa TKwattr
+                                       assert tkwattrnode11 isa nullable TKwattr
                                        var tattridnode13 = nodearraylist9
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist10
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist13
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -8717,9 +8730,9 @@ init do end
 end
 private class ReduceAction170
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -8732,28 +8745,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist6
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist8
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist11
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -8772,9 +8785,9 @@ init do end
 end
 private class ReduceAction171
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -8786,26 +8799,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist5
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -8824,9 +8837,9 @@ init do end
 end
 private class ReduceAction172
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -8839,28 +8852,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwattrnode9 = nodearraylist6
-                                       assert tkwattrnode9 isa TKwattr
+                                       assert tkwattrnode9 isa nullable TKwattr
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist8
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist11
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -8879,9 +8892,9 @@ init do end
 end
 private class ReduceAction173
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -8892,20 +8905,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var pvisibilitynode6 = nodearraylist3
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwattrnode7 = nodearraylist4
-                                       assert tkwattrnode7 isa TKwattr
+                                       assert tkwattrnode7 isa nullable TKwattr
                                        var tattridnode9 = nodearraylist5
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var ptypenode10 = nodearraylist6
-                                       assert ptypenode10 isa PType
+                                       assert ptypenode10 isa nullable PType
                                        var pexprnode11 = nodearraylist9
-                                       assert pexprnode11 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode11 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -8924,9 +8937,9 @@ init do end
 end
 private class ReduceAction174
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -8934,26 +8947,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist4
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist5
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist6
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -8972,9 +8985,9 @@ init do end
 end
 private class ReduceAction175
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -8983,28 +8996,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9023,29 +9036,29 @@ init do end
 end
 private class ReduceAction176
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist4
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -9064,9 +9077,9 @@ init do end
 end
 private class ReduceAction177
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -9075,28 +9088,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9115,9 +9128,9 @@ init do end
 end
 private class ReduceAction178
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -9127,30 +9140,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9169,9 +9182,9 @@ init do end
 end
 private class ReduceAction179
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -9179,22 +9192,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -9213,29 +9226,29 @@ init do end
 end
 private class ReduceAction180
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist4
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -9254,9 +9267,9 @@ init do end
 end
 private class ReduceAction181
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -9264,22 +9277,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -9298,22 +9311,22 @@ init do end
 end
 private class ReduceAction182
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode6 = nodearraylist2
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwvarnode8 = nodearraylist3
-                                       assert tkwvarnode8 isa TKwvar
+                                       assert tkwvarnode8 isa nullable TKwvar
                                        var tattridnode9 = nodearraylist4
-                                       assert tattridnode9 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode9 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -9332,9 +9345,9 @@ init do end
 end
 private class ReduceAction183
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -9343,28 +9356,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist4
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9383,9 +9396,9 @@ init do end
 end
 private class ReduceAction184
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -9395,30 +9408,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9437,9 +9450,9 @@ init do end
 end
 private class ReduceAction185
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -9447,22 +9460,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -9481,9 +9494,9 @@ init do end
 end
 private class ReduceAction186
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -9493,30 +9506,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9535,9 +9548,9 @@ init do end
 end
 private class ReduceAction187
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -9548,32 +9561,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist6
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist7
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist8
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist9
-                                       assert tattridnode13 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode13 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9592,9 +9605,9 @@ init do end
 end
 private class ReduceAction188
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -9603,24 +9616,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist6
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -9639,9 +9652,9 @@ init do end
 end
 private class ReduceAction189
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -9649,22 +9662,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -9683,9 +9696,9 @@ init do end
 end
 private class ReduceAction190
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -9694,24 +9707,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist6
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode11 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -9730,25 +9743,25 @@ init do end
 end
 private class ReduceAction191
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var pvisibilitynode6 = nodearraylist3
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwvarnode8 = nodearraylist4
-                                       assert tkwvarnode8 isa TKwvar
+                                       assert tkwvarnode8 isa nullable TKwvar
                                        var tattridnode9 = nodearraylist5
-                                       assert tattridnode9 isa TAttrid
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert tattridnode9 isa nullable TAttrid
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -9767,9 +9780,9 @@ init do end
 end
 private class ReduceAction192
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -9778,28 +9791,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist4
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist5
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist6
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist7
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9818,9 +9831,9 @@ init do end
 end
 private class ReduceAction193
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -9830,30 +9843,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9872,9 +9885,9 @@ init do end
 end
 private class ReduceAction194
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -9882,22 +9895,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist4
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist6
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -9916,9 +9929,9 @@ init do end
 end
 private class ReduceAction195
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -9928,30 +9941,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -9970,9 +9983,9 @@ init do end
 end
 private class ReduceAction196
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -9983,32 +9996,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10027,9 +10040,9 @@ init do end
 end
 private class ReduceAction197
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -10038,24 +10051,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -10074,9 +10087,9 @@ init do end
 end
 private class ReduceAction198
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -10084,22 +10097,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist4
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist6
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -10118,9 +10131,9 @@ init do end
 end
 private class ReduceAction199
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -10129,24 +10142,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -10165,25 +10178,25 @@ init do end
 end
 private class ReduceAction200
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode6 = nodearraylist2
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwvarnode8 = nodearraylist3
-                                       assert tkwvarnode8 isa TKwvar
+                                       assert tkwvarnode8 isa nullable TKwvar
                                        var tattridnode9 = nodearraylist4
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var ptypenode10 = nodearraylist5
-                                       assert ptypenode10 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode10 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -10202,9 +10215,9 @@ init do end
 end
 private class ReduceAction201
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -10214,30 +10227,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist4
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10256,9 +10269,9 @@ init do end
 end
 private class ReduceAction202
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -10269,32 +10282,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10313,9 +10326,9 @@ init do end
 end
 private class ReduceAction203
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -10324,24 +10337,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -10360,9 +10373,9 @@ init do end
 end
 private class ReduceAction204
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -10373,32 +10386,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10417,9 +10430,9 @@ init do end
 end
 private class ReduceAction205
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -10431,34 +10444,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist6
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist7
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist8
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist9
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist10
-                                       assert ptypenode14 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode14 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10477,9 +10490,9 @@ init do end
 end
 private class ReduceAction206
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -10489,26 +10502,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist6
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist8
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -10527,9 +10540,9 @@ init do end
 end
 private class ReduceAction207
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -10538,24 +10551,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -10574,9 +10587,9 @@ init do end
 end
 private class ReduceAction208
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -10586,26 +10599,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist6
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist8
-                                       assert ptypenode12 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode12 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -10624,9 +10637,9 @@ init do end
 end
 private class ReduceAction209
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -10634,18 +10647,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var pvisibilitynode6 = nodearraylist3
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwvarnode8 = nodearraylist4
-                                       assert tkwvarnode8 isa TKwvar
+                                       assert tkwvarnode8 isa nullable TKwvar
                                        var tattridnode9 = nodearraylist5
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var ptypenode10 = nodearraylist6
-                                       assert ptypenode10 isa PType
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert ptypenode10 isa nullable PType
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -10664,9 +10677,9 @@ init do end
 end
 private class ReduceAction210
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -10677,28 +10690,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist4
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist5
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist6
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist9
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10717,9 +10730,9 @@ init do end
 end
 private class ReduceAction211
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -10731,30 +10744,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist10
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10773,9 +10786,9 @@ init do end
 end
 private class ReduceAction212
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -10785,22 +10798,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist4
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist8
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -10819,9 +10832,9 @@ init do end
 end
 private class ReduceAction213
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -10833,30 +10846,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist10
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10875,9 +10888,9 @@ init do end
 end
 private class ReduceAction214
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -10890,32 +10903,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -10934,9 +10947,9 @@ init do end
 end
 private class ReduceAction215
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -10947,24 +10960,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -10983,9 +10996,9 @@ init do end
 end
 private class ReduceAction216
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -10995,22 +11008,22 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist4
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist8
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -11029,9 +11042,9 @@ init do end
 end
 private class ReduceAction217
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -11042,24 +11055,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -11078,9 +11091,9 @@ init do end
 end
 private class ReduceAction218
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -11089,16 +11102,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode6 = nodearraylist2
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwvarnode8 = nodearraylist3
-                                       assert tkwvarnode8 isa TKwvar
+                                       assert tkwvarnode8 isa nullable TKwvar
                                        var tattridnode9 = nodearraylist4
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var pexprnode11 = nodearraylist7
-                                       assert pexprnode11 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode11 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -11117,9 +11130,9 @@ init do end
 end
 private class ReduceAction219
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -11131,30 +11144,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist4
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist10
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -11173,9 +11186,9 @@ init do end
 end
 private class ReduceAction220
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -11188,32 +11201,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -11232,9 +11245,9 @@ init do end
 end
 private class ReduceAction221
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -11245,24 +11258,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -11281,9 +11294,9 @@ init do end
 end
 private class ReduceAction222
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -11296,32 +11309,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -11340,9 +11353,9 @@ init do end
 end
 private class ReduceAction223
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -11356,34 +11369,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist6
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist7
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist8
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist9
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var pexprnode15 = nodearraylist12
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -11402,9 +11415,9 @@ init do end
 end
 private class ReduceAction224
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -11416,26 +11429,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist6
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -11454,9 +11467,9 @@ init do end
 end
 private class ReduceAction225
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -11467,24 +11480,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -11503,9 +11516,9 @@ init do end
 end
 private class ReduceAction226
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -11517,26 +11530,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist6
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -11555,9 +11568,9 @@ init do end
 end
 private class ReduceAction227
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -11567,18 +11580,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var pvisibilitynode6 = nodearraylist3
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwvarnode8 = nodearraylist4
-                                       assert tkwvarnode8 isa TKwvar
+                                       assert tkwvarnode8 isa nullable TKwvar
                                        var tattridnode9 = nodearraylist5
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var pexprnode11 = nodearraylist8
-                                       assert pexprnode11 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode11 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -11597,9 +11610,9 @@ init do end
 end
 private class ReduceAction228
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -11611,30 +11624,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist4
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist5
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist6
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist7
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist10
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -11653,9 +11666,9 @@ init do end
 end
 private class ReduceAction229
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -11668,32 +11681,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -11712,9 +11725,9 @@ init do end
 end
 private class ReduceAction230
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -11725,24 +11738,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist4
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist6
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -11761,9 +11774,9 @@ init do end
 end
 private class ReduceAction231
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -11776,32 +11789,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -11820,9 +11833,9 @@ init do end
 end
 private class ReduceAction232
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -11836,34 +11849,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist12
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -11882,9 +11895,9 @@ init do end
 end
 private class ReduceAction233
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -11896,26 +11909,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -11934,9 +11947,9 @@ init do end
 end
 private class ReduceAction234
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -11947,24 +11960,24 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist3
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist4
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist5
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist6
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist9
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -11983,9 +11996,9 @@ init do end
 end
 private class ReduceAction235
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -11997,26 +12010,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -12035,9 +12048,9 @@ init do end
 end
 private class ReduceAction236
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -12047,18 +12060,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode6 = nodearraylist2
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwvarnode8 = nodearraylist3
-                                       assert tkwvarnode8 isa TKwvar
+                                       assert tkwvarnode8 isa nullable TKwvar
                                        var tattridnode9 = nodearraylist4
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var ptypenode10 = nodearraylist5
-                                       assert ptypenode10 isa PType
+                                       assert ptypenode10 isa nullable PType
                                        var pexprnode11 = nodearraylist8
-                                       assert pexprnode11 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode11 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -12077,9 +12090,9 @@ init do end
 end
 private class ReduceAction237
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -12092,32 +12105,32 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist3
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist4
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist5
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist6
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist7
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist8
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist11
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -12136,9 +12149,9 @@ init do end
 end
 private class ReduceAction238
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -12152,34 +12165,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist12
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -12198,9 +12211,9 @@ init do end
 end
 private class ReduceAction239
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -12212,26 +12225,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwreadablenode5 = nodearraylist2
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                null,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -12250,9 +12263,9 @@ init do end
 end
 private class ReduceAction240
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
@@ -12266,34 +12279,34 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwwritablenode8 = nodearraylist4
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist5
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist6
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist7
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist8
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist9
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist12
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -12312,9 +12325,9 @@ init do end
 end
 private class ReduceAction241
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist13 = p.pop
                                        var nodearraylist12 = p.pop
                                        var nodearraylist11 = p.pop
@@ -12329,36 +12342,36 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var tkwwritablenode8 = nodearraylist5
-                                       assert tkwwritablenode8 isa TKwwritable
-                                       var pablenode6 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode8 isa nullable TKwwritable
+                                       var pablenode6: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode7,
                                                tkwwritablenode8
                                        )
                                        var tkwredefnode9 = nodearraylist6
-                                       assert tkwredefnode9 isa TKwredef
+                                       assert tkwredefnode9 isa nullable TKwredef
                                        var pvisibilitynode10 = nodearraylist7
-                                       assert pvisibilitynode10 isa PVisibility
+                                       assert pvisibilitynode10 isa nullable PVisibility
                                        var tkwvarnode12 = nodearraylist8
-                                       assert tkwvarnode12 isa TKwvar
+                                       assert tkwvarnode12 isa nullable TKwvar
                                        var tattridnode13 = nodearraylist9
-                                       assert tattridnode13 isa TAttrid
+                                       assert tattridnode13 isa nullable TAttrid
                                        var ptypenode14 = nodearraylist10
-                                       assert ptypenode14 isa PType
+                                       assert ptypenode14 isa nullable PType
                                        var pexprnode15 = nodearraylist13
-                                       assert pexprnode15 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode15 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                pablenode6,
@@ -12377,9 +12390,9 @@ init do end
 end
 private class ReduceAction242
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -12392,28 +12405,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode4 = nodearraylist2
-                                       assert tkwredefnode4 isa TKwredef
+                                       assert tkwredefnode4 isa nullable TKwredef
                                        var tkwreadablenode5 = nodearraylist3
-                                       assert tkwreadablenode5 isa TKwreadable
-                                       var pablenode3 = new AReadAble.init_areadable(
+                                       assert tkwreadablenode5 isa nullable TKwreadable
+                                       var pablenode3: nullable AReadAble = new AReadAble.init_areadable(
                                                tkwredefnode4,
                                                tkwreadablenode5
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist6
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist8
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist11
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                pablenode3,
                                                null,
@@ -12432,9 +12445,9 @@ init do end
 end
 private class ReduceAction243
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -12446,26 +12459,26 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwwritablenode6 = nodearraylist2
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                null,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist3
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist4
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist5
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist6
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist7
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist10
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -12484,9 +12497,9 @@ init do end
 end
 private class ReduceAction244
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -12499,28 +12512,28 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var tkwwritablenode6 = nodearraylist3
-                                       assert tkwwritablenode6 isa TKwwritable
-                                       var pablenode4 = new AWriteAble.init_awriteable(
+                                       assert tkwwritablenode6 isa nullable TKwwritable
+                                       var pablenode4: nullable AWriteAble = new AWriteAble.init_awriteable(
                                                tkwredefnode5,
                                                tkwwritablenode6
                                        )
                                        var tkwredefnode7 = nodearraylist4
-                                       assert tkwredefnode7 isa TKwredef
+                                       assert tkwredefnode7 isa nullable TKwredef
                                        var pvisibilitynode8 = nodearraylist5
-                                       assert pvisibilitynode8 isa PVisibility
+                                       assert pvisibilitynode8 isa nullable PVisibility
                                        var tkwvarnode10 = nodearraylist6
-                                       assert tkwvarnode10 isa TKwvar
+                                       assert tkwvarnode10 isa nullable TKwvar
                                        var tattridnode11 = nodearraylist7
-                                       assert tattridnode11 isa TAttrid
+                                       assert tattridnode11 isa nullable TAttrid
                                        var ptypenode12 = nodearraylist8
-                                       assert ptypenode12 isa PType
+                                       assert ptypenode12 isa nullable PType
                                        var pexprnode13 = nodearraylist11
-                                       assert pexprnode13 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode13 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                pablenode4,
@@ -12539,9 +12552,9 @@ init do end
 end
 private class ReduceAction245
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -12552,20 +12565,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode5 = nodearraylist2
-                                       assert tkwredefnode5 isa TKwredef
+                                       assert tkwredefnode5 isa nullable TKwredef
                                        var pvisibilitynode6 = nodearraylist3
-                                       assert pvisibilitynode6 isa PVisibility
+                                       assert pvisibilitynode6 isa nullable PVisibility
                                        var tkwvarnode8 = nodearraylist4
-                                       assert tkwvarnode8 isa TKwvar
+                                       assert tkwvarnode8 isa nullable TKwvar
                                        var tattridnode9 = nodearraylist5
-                                       assert tattridnode9 isa TAttrid
+                                       assert tattridnode9 isa nullable TAttrid
                                        var ptypenode10 = nodearraylist6
-                                       assert ptypenode10 isa PType
+                                       assert ptypenode10 isa nullable PType
                                        var pexprnode11 = nodearraylist9
-                                       assert pexprnode11 isa PExpr
-                                       var ppropdefnode1 = new AAttrPropdef.init_aattrpropdef(
+                                       assert pexprnode11 isa nullable PExpr
+                                       var ppropdefnode1: nullable AAttrPropdef = new AAttrPropdef.init_aattrpropdef(
                                                pdocnode2,
                                                null,
                                                null,
@@ -12584,9 +12597,9 @@ init do end
 end
 private class ReduceAction246
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -12594,16 +12607,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwinitnode5 = nodearraylist3
-                                       assert tkwinitnode5 isa TKwinit
+                                       assert tkwinitnode5 isa nullable TKwinit
                                        var psignaturenode7 = nodearraylist4
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist6
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteInitPropdef.init_aconcreteinitpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteInitPropdef = new AConcreteInitPropdef.init_aconcreteinitpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -12619,9 +12632,9 @@ init do end
 end
 private class ReduceAction247
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -12630,18 +12643,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwinitnode5 = nodearraylist4
-                                       assert tkwinitnode5 isa TKwinit
+                                       assert tkwinitnode5 isa nullable TKwinit
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist7
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteInitPropdef.init_aconcreteinitpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteInitPropdef = new AConcreteInitPropdef.init_aconcreteinitpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -12657,9 +12670,9 @@ init do end
 end
 private class ReduceAction248
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -12668,18 +12681,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwinitnode5 = nodearraylist3
-                                       assert tkwinitnode5 isa TKwinit
+                                       assert tkwinitnode5 isa nullable TKwinit
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist7
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteInitPropdef.init_aconcreteinitpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteInitPropdef = new AConcreteInitPropdef.init_aconcreteinitpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -12695,9 +12708,9 @@ init do end
 end
 private class ReduceAction249
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -12707,20 +12720,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwinitnode5 = nodearraylist4
-                                       assert tkwinitnode5 isa TKwinit
+                                       assert tkwinitnode5 isa nullable TKwinit
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist8
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteInitPropdef.init_aconcreteinitpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteInitPropdef = new AConcreteInitPropdef.init_aconcreteinitpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -12736,9 +12749,9 @@ init do end
 end
 private class ReduceAction250
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -12747,16 +12760,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwinitnode5 = nodearraylist3
-                                       assert tkwinitnode5 isa TKwinit
+                                       assert tkwinitnode5 isa nullable TKwinit
                                        var psignaturenode7 = nodearraylist4
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist6
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteInitPropdef.init_aconcreteinitpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteInitPropdef = new AConcreteInitPropdef.init_aconcreteinitpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -12772,9 +12785,9 @@ init do end
 end
 private class ReduceAction251
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -12784,18 +12797,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwinitnode5 = nodearraylist4
-                                       assert tkwinitnode5 isa TKwinit
+                                       assert tkwinitnode5 isa nullable TKwinit
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist7
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteInitPropdef.init_aconcreteinitpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteInitPropdef = new AConcreteInitPropdef.init_aconcreteinitpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -12811,9 +12824,9 @@ init do end
 end
 private class ReduceAction252
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -12823,18 +12836,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwinitnode5 = nodearraylist3
-                                       assert tkwinitnode5 isa TKwinit
+                                       assert tkwinitnode5 isa nullable TKwinit
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist7
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteInitPropdef.init_aconcreteinitpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteInitPropdef = new AConcreteInitPropdef.init_aconcreteinitpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -12850,9 +12863,9 @@ init do end
 end
 private class ReduceAction253
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -12863,20 +12876,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwinitnode5 = nodearraylist4
-                                       assert tkwinitnode5 isa TKwinit
+                                       assert tkwinitnode5 isa nullable TKwinit
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist8
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteInitPropdef.init_aconcreteinitpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteInitPropdef = new AConcreteInitPropdef.init_aconcreteinitpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -12892,25 +12905,25 @@ init do end
 end
 private class ReduceAction254
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwtypenode5 = nodearraylist3
-                                       assert tkwtypenode5 isa TKwtype
+                                       assert tkwtypenode5 isa nullable TKwtype
                                        var tclassidnode6 = nodearraylist4
-                                       assert tclassidnode6 isa TClassid
+                                       assert tclassidnode6 isa nullable TClassid
                                        var ptypenode7 = nodearraylist5
-                                       assert ptypenode7 isa PType
-                                       var ppropdefnode1 = new ATypePropdef.init_atypepropdef(
+                                       assert ptypenode7 isa nullable PType
+                                       var ppropdefnode1: nullable ATypePropdef = new ATypePropdef.init_atypepropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -12925,9 +12938,9 @@ init do end
 end
 private class ReduceAction255
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -12935,18 +12948,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwtypenode5 = nodearraylist4
-                                       assert tkwtypenode5 isa TKwtype
+                                       assert tkwtypenode5 isa nullable TKwtype
                                        var tclassidnode6 = nodearraylist5
-                                       assert tclassidnode6 isa TClassid
+                                       assert tclassidnode6 isa nullable TClassid
                                        var ptypenode7 = nodearraylist6
-                                       assert ptypenode7 isa PType
-                                       var ppropdefnode1 = new ATypePropdef.init_atypepropdef(
+                                       assert ptypenode7 isa nullable PType
+                                       var ppropdefnode1: nullable ATypePropdef = new ATypePropdef.init_atypepropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -12961,10 +12974,10 @@ init do end
 end
 private class ReduceAction256
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
-                                       var pvisibilitynode1 = new APublicVisibility.init_apublicvisibility(
+                                       var node_list: nullable Object = null
+                                       var pvisibilitynode1: nullable APublicVisibility = new APublicVisibility.init_apublicvisibility(
                                        )
                                        node_list = pvisibilitynode1
                                        p.push(p.go_to(13), node_list)
@@ -12973,14 +12986,14 @@ init do end
 end
 private class ReduceAction257
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwprivatenode2 = nodearraylist1
-                                       assert tkwprivatenode2 isa TKwprivate
-                                       var pvisibilitynode1 = new APrivateVisibility.init_aprivatevisibility(
+                                       assert tkwprivatenode2 isa nullable TKwprivate
+                                       var pvisibilitynode1: nullable APrivateVisibility = new APrivateVisibility.init_aprivatevisibility(
                                                tkwprivatenode2
                                        )
                                        node_list = pvisibilitynode1
@@ -12990,14 +13003,14 @@ init do end
 end
 private class ReduceAction258
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwprotectednode2 = nodearraylist1
-                                       assert tkwprotectednode2 isa TKwprotected
-                                       var pvisibilitynode1 = new AProtectedVisibility.init_aprotectedvisibility(
+                                       assert tkwprotectednode2 isa nullable TKwprotected
+                                       var pvisibilitynode1: nullable AProtectedVisibility = new AProtectedVisibility.init_aprotectedvisibility(
                                                tkwprotectednode2
                                        )
                                        node_list = pvisibilitynode1
@@ -13007,14 +13020,14 @@ init do end
 end
 private class ReduceAction259
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwintrudenode2 = nodearraylist1
-                                       assert tkwintrudenode2 isa TKwintrude
-                                       var pvisibilitynode1 = new AIntrudeVisibility.init_aintrudevisibility(
+                                       assert tkwintrudenode2 isa nullable TKwintrude
+                                       var pvisibilitynode1: nullable AIntrudeVisibility = new AIntrudeVisibility.init_aintrudevisibility(
                                                tkwintrudenode2
                                        )
                                        node_list = pvisibilitynode1
@@ -13024,13 +13037,13 @@ init do end
 end
 private class ReduceAction260
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tidnode2 = nodearraylist1
-                                       assert tidnode2 isa TId
-                                       var pmethidnode1 = new AIdMethid.init_aidmethid(
+                                       assert tidnode2 isa nullable TId
+                                       var pmethidnode1: nullable AIdMethid = new AIdMethid.init_aidmethid(
                                                tidnode2
                                        )
                                        node_list = pmethidnode1
@@ -13040,13 +13053,13 @@ init do end
 end
 private class ReduceAction261
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tplusnode2 = nodearraylist1
-                                       assert tplusnode2 isa TPlus
-                                       var pmethidnode1 = new APlusMethid.init_aplusmethid(
+                                       assert tplusnode2 isa nullable TPlus
+                                       var pmethidnode1: nullable APlusMethid = new APlusMethid.init_aplusmethid(
                                                tplusnode2
                                        )
                                        node_list = pmethidnode1
@@ -13056,13 +13069,13 @@ init do end
 end
 private class ReduceAction262
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tminusnode2 = nodearraylist1
-                                       assert tminusnode2 isa TMinus
-                                       var pmethidnode1 = new AMinusMethid.init_aminusmethid(
+                                       assert tminusnode2 isa nullable TMinus
+                                       var pmethidnode1: nullable AMinusMethid = new AMinusMethid.init_aminusmethid(
                                                tminusnode2
                                        )
                                        node_list = pmethidnode1
@@ -13072,13 +13085,13 @@ init do end
 end
 private class ReduceAction263
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tstarnode2 = nodearraylist1
-                                       assert tstarnode2 isa TStar
-                                       var pmethidnode1 = new AStarMethid.init_astarmethid(
+                                       assert tstarnode2 isa nullable TStar
+                                       var pmethidnode1: nullable AStarMethid = new AStarMethid.init_astarmethid(
                                                tstarnode2
                                        )
                                        node_list = pmethidnode1
@@ -13088,13 +13101,13 @@ init do end
 end
 private class ReduceAction264
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tslashnode2 = nodearraylist1
-                                       assert tslashnode2 isa TSlash
-                                       var pmethidnode1 = new ASlashMethid.init_aslashmethid(
+                                       assert tslashnode2 isa nullable TSlash
+                                       var pmethidnode1: nullable ASlashMethid = new ASlashMethid.init_aslashmethid(
                                                tslashnode2
                                        )
                                        node_list = pmethidnode1
@@ -13104,13 +13117,13 @@ init do end
 end
 private class ReduceAction265
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tpercentnode2 = nodearraylist1
-                                       assert tpercentnode2 isa TPercent
-                                       var pmethidnode1 = new APercentMethid.init_apercentmethid(
+                                       assert tpercentnode2 isa nullable TPercent
+                                       var pmethidnode1: nullable APercentMethid = new APercentMethid.init_apercentmethid(
                                                tpercentnode2
                                        )
                                        node_list = pmethidnode1
@@ -13120,13 +13133,13 @@ init do end
 end
 private class ReduceAction266
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var teqnode2 = nodearraylist1
-                                       assert teqnode2 isa TEq
-                                       var pmethidnode1 = new AEqMethid.init_aeqmethid(
+                                       assert teqnode2 isa nullable TEq
+                                       var pmethidnode1: nullable AEqMethid = new AEqMethid.init_aeqmethid(
                                                teqnode2
                                        )
                                        node_list = pmethidnode1
@@ -13136,13 +13149,13 @@ init do end
 end
 private class ReduceAction267
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tnenode2 = nodearraylist1
-                                       assert tnenode2 isa TNe
-                                       var pmethidnode1 = new ANeMethid.init_anemethid(
+                                       assert tnenode2 isa nullable TNe
+                                       var pmethidnode1: nullable ANeMethid = new ANeMethid.init_anemethid(
                                                tnenode2
                                        )
                                        node_list = pmethidnode1
@@ -13152,13 +13165,13 @@ init do end
 end
 private class ReduceAction268
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tlenode2 = nodearraylist1
-                                       assert tlenode2 isa TLe
-                                       var pmethidnode1 = new ALeMethid.init_alemethid(
+                                       assert tlenode2 isa nullable TLe
+                                       var pmethidnode1: nullable ALeMethid = new ALeMethid.init_alemethid(
                                                tlenode2
                                        )
                                        node_list = pmethidnode1
@@ -13168,13 +13181,13 @@ init do end
 end
 private class ReduceAction269
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tgenode2 = nodearraylist1
-                                       assert tgenode2 isa TGe
-                                       var pmethidnode1 = new AGeMethid.init_agemethid(
+                                       assert tgenode2 isa nullable TGe
+                                       var pmethidnode1: nullable AGeMethid = new AGeMethid.init_agemethid(
                                                tgenode2
                                        )
                                        node_list = pmethidnode1
@@ -13184,13 +13197,13 @@ init do end
 end
 private class ReduceAction270
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tltnode2 = nodearraylist1
-                                       assert tltnode2 isa TLt
-                                       var pmethidnode1 = new ALtMethid.init_altmethid(
+                                       assert tltnode2 isa nullable TLt
+                                       var pmethidnode1: nullable ALtMethid = new ALtMethid.init_altmethid(
                                                tltnode2
                                        )
                                        node_list = pmethidnode1
@@ -13200,13 +13213,13 @@ init do end
 end
 private class ReduceAction271
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tgtnode2 = nodearraylist1
-                                       assert tgtnode2 isa TGt
-                                       var pmethidnode1 = new AGtMethid.init_agtmethid(
+                                       assert tgtnode2 isa nullable TGt
+                                       var pmethidnode1: nullable AGtMethid = new AGtMethid.init_agtmethid(
                                                tgtnode2
                                        )
                                        node_list = pmethidnode1
@@ -13216,16 +13229,16 @@ init do end
 end
 private class ReduceAction272
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tobranode2 = nodearraylist1
-                                       assert tobranode2 isa TObra
+                                       assert tobranode2 isa nullable TObra
                                        var tcbranode3 = nodearraylist2
-                                       assert tcbranode3 isa TCbra
-                                       var pmethidnode1 = new ABraMethid.init_abramethid(
+                                       assert tcbranode3 isa nullable TCbra
+                                       var pmethidnode1: nullable ABraMethid = new ABraMethid.init_abramethid(
                                                tobranode2,
                                                tcbranode3
                                        )
@@ -13236,13 +13249,13 @@ init do end
 end
 private class ReduceAction273
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tstarshipnode2 = nodearraylist1
-                                       assert tstarshipnode2 isa TStarship
-                                       var pmethidnode1 = new AStarshipMethid.init_astarshipmethid(
+                                       assert tstarshipnode2 isa nullable TStarship
+                                       var pmethidnode1: nullable AStarshipMethid = new AStarshipMethid.init_astarshipmethid(
                                                tstarshipnode2
                                        )
                                        node_list = pmethidnode1
@@ -13252,16 +13265,16 @@ init do end
 end
 private class ReduceAction274
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tidnode2 = nodearraylist1
-                                       assert tidnode2 isa TId
+                                       assert tidnode2 isa nullable TId
                                        var tassignnode3 = nodearraylist2
-                                       assert tassignnode3 isa TAssign
-                                       var pmethidnode1 = new AAssignMethid.init_aassignmethid(
+                                       assert tassignnode3 isa nullable TAssign
+                                       var pmethidnode1: nullable AAssignMethid = new AAssignMethid.init_aassignmethid(
                                                tidnode2,
                                                tassignnode3
                                        )
@@ -13272,19 +13285,19 @@ init do end
 end
 private class ReduceAction275
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tobranode2 = nodearraylist1
-                                       assert tobranode2 isa TObra
+                                       assert tobranode2 isa nullable TObra
                                        var tcbranode3 = nodearraylist2
-                                       assert tcbranode3 isa TCbra
+                                       assert tcbranode3 isa nullable TCbra
                                        var tassignnode4 = nodearraylist3
-                                       assert tassignnode4 isa TAssign
-                                       var pmethidnode1 = new ABraassignMethid.init_abraassignmethid(
+                                       assert tassignnode4 isa nullable TAssign
+                                       var pmethidnode1: nullable ABraassignMethid = new ABraassignMethid.init_abraassignmethid(
                                                tobranode2,
                                                tcbranode3,
                                                tassignnode4
@@ -13296,22 +13309,22 @@ init do end
 end
 private class ReduceAction276
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var listnode5 = new Array[Object]
-                                       var listnode4 = nodearraylist1 
+                                       var listnode4 = nodearraylist1
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var psignaturenode1 = new ASignature.init_asignature(
+#                                      end
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode2,
                                                null,
                                                listnode5
@@ -13323,32 +13336,32 @@ init do end
 end
 private class ReduceAction277
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist2 
+#                                      end
+                                       var listnode5 = nodearraylist2
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var psignaturenode1 = new ASignature.init_asignature(
+#                                      end
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode3,
                                                null,
                                                listnode6
@@ -13360,25 +13373,25 @@ init do end
 end
 private class ReduceAction278
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var listnode5 = new Array[Object]
                                        var ptypenode3 = nodearraylist1
-                                       assert ptypenode3 isa PType
-                                       var listnode4 = nodearraylist2 
+                                       assert ptypenode3 isa nullable PType
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var psignaturenode1 = new ASignature.init_asignature(
+#                                      end
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode2,
                                                ptypenode3,
                                                listnode5
@@ -13390,35 +13403,35 @@ init do end
 end
 private class ReduceAction279
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        var ptypenode4 = nodearraylist2
-                                       assert ptypenode4 isa PType
-                                       var listnode5 = nodearraylist3 
+                                       assert ptypenode4 isa nullable PType
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var psignaturenode1 = new ASignature.init_asignature(
+#                                      end
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode3,
                                                ptypenode4,
                                                listnode6
@@ -13430,13 +13443,13 @@ init do end
 end
 private class ReduceAction280
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var listnode4 = new Array[Object]
-                                       var psignaturenode1 = new ASignature.init_asignature(
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode2,
                                                null,
                                                listnode4
@@ -13448,23 +13461,23 @@ init do end
 end
 private class ReduceAction281
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode5 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
-                                       var psignaturenode1 = new ASignature.init_asignature(
+#                                      end
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode3,
                                                null,
                                                listnode5
@@ -13476,16 +13489,16 @@ init do end
 end
 private class ReduceAction282
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var listnode4 = new Array[Object]
                                        var ptypenode3 = nodearraylist1
-                                       assert ptypenode3 isa PType
-                                       var psignaturenode1 = new ASignature.init_asignature(
+                                       assert ptypenode3 isa nullable PType
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode2,
                                                ptypenode3,
                                                listnode4
@@ -13497,26 +13510,26 @@ init do end
 end
 private class ReduceAction283
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode5 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        var ptypenode4 = nodearraylist2
-                                       assert ptypenode4 isa PType
-                                       var psignaturenode1 = new ASignature.init_asignature(
+                                       assert ptypenode4 isa nullable PType
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode3,
                                                ptypenode4,
                                                listnode5
@@ -13528,12 +13541,12 @@ init do end
 end
 private class ReduceAction284
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var listnode2 = new Array[Object]
                                        var listnode4 = new Array[Object]
-                                       var psignaturenode1 = new ASignature.init_asignature(
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode2,
                                                null,
                                                listnode4
@@ -13545,22 +13558,22 @@ init do end
 end
 private class ReduceAction285
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode5 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
-                                       var psignaturenode1 = new ASignature.init_asignature(
+#                                      end
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode3,
                                                null,
                                                listnode5
@@ -13572,15 +13585,15 @@ init do end
 end
 private class ReduceAction286
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var listnode4 = new Array[Object]
                                        var ptypenode3 = nodearraylist1
-                                       assert ptypenode3 isa PType
-                                       var psignaturenode1 = new ASignature.init_asignature(
+                                       assert ptypenode3 isa nullable PType
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode2,
                                                ptypenode3,
                                                listnode4
@@ -13592,25 +13605,25 @@ init do end
 end
 private class ReduceAction287
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var listnode5 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        var ptypenode4 = nodearraylist2
-                                       assert ptypenode4 isa PType
-                                       var psignaturenode1 = new ASignature.init_asignature(
+                                       assert ptypenode4 isa nullable PType
+                                       var psignaturenode1: nullable ASignature = new ASignature.init_asignature(
                                                listnode3,
                                                ptypenode4,
                                                listnode5
@@ -13622,9 +13635,9 @@ init do end
 end
 private class ReduceAction288
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -13632,7 +13645,7 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pparamnode1 = nodearraylist3
-                                       assert pparamnode1 isa PParam
+                                       assert pparamnode1 isa nullable PParam
                                        if pparamnode1 != null then
                                                listnode2.add(pparamnode1)
                                        end
@@ -13643,9 +13656,9 @@ init do end
 end
 private class ReduceAction289
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -13654,19 +13667,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pparamnode1 = nodearraylist3
-                                       assert pparamnode1 isa PParam
-                                       var listnode2 = nodearraylist4 
+                                       assert pparamnode1 isa nullable PParam
+                                       var listnode2 = nodearraylist4
                                        assert listnode2 isa Array[Object]
                                        if pparamnode1 != null then
                                                listnode3.add(pparamnode1)
                                        end
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(17), node_list)
        end
@@ -13674,9 +13687,9 @@ init do end
 end
 private class ReduceAction290
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
@@ -13688,14 +13701,14 @@ init do end
 end
 private class ReduceAction291
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pparamnode1 = nodearraylist3
-                                       assert pparamnode1 isa PParam
+                                       assert pparamnode1 isa nullable PParam
                                        node_list = pparamnode1
                                        p.push(p.go_to(18), node_list)
        end
@@ -13703,13 +13716,13 @@ init do end
 end
 private class ReduceAction292
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tidnode2 = nodearraylist1
-                                       assert tidnode2 isa TId
-                                       var pparamnode1 = new AParam.init_aparam(
+                                       assert tidnode2 isa nullable TId
+                                       var pparamnode1: nullable AParam = new AParam.init_aparam(
                                                tidnode2,
                                                null,
                                                null
@@ -13721,16 +13734,16 @@ init do end
 end
 private class ReduceAction293
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tidnode2 = nodearraylist1
-                                       assert tidnode2 isa TId
+                                       assert tidnode2 isa nullable TId
                                        var ptypenode3 = nodearraylist2
-                                       assert ptypenode3 isa PType
-                                       var pparamnode1 = new AParam.init_aparam(
+                                       assert ptypenode3 isa nullable PType
+                                       var pparamnode1: nullable AParam = new AParam.init_aparam(
                                                tidnode2,
                                                ptypenode3,
                                                null
@@ -13742,19 +13755,19 @@ init do end
 end
 private class ReduceAction294
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tidnode2 = nodearraylist1
-                                       assert tidnode2 isa TId
+                                       assert tidnode2 isa nullable TId
                                        var ptypenode3 = nodearraylist2
-                                       assert ptypenode3 isa PType
+                                       assert ptypenode3 isa nullable PType
                                        var tdotdotdotnode4 = nodearraylist3
-                                       assert tdotdotdotnode4 isa TDotdotdot
-                                       var pparamnode1 = new AParam.init_aparam(
+                                       assert tdotdotdotnode4 isa nullable TDotdotdot
+                                       var pparamnode1: nullable AParam = new AParam.init_aparam(
                                                tidnode2,
                                                ptypenode3,
                                                tdotdotdotnode4
@@ -13766,21 +13779,21 @@ init do end
 end
 private class ReduceAction295
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
-                                       var listnode1 = nodearraylist2 
+                                       var listnode1 = nodearraylist2
                                        assert listnode1 isa Array[Object]
-                                       if listnode1 != null then
+#                                      if listnode1 != null then
                                                if listnode2.is_empty then
                                                        listnode2 = listnode1
                                                else
                                                        listnode2.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode2
                                        p.push(p.go_to(20), node_list)
        end
@@ -13788,21 +13801,21 @@ init do end
 end
 private class ReduceAction296
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tidnode4 = nodearraylist3
-                                       assert tidnode4 isa TId
+                                       assert tidnode4 isa nullable TId
                                        var psignaturenode5 = nodearraylist4
-                                       assert psignaturenode5 isa PSignature
-                                       var pclosuredeclnode1 = new AClosureDecl.init_aclosuredecl(
+                                       assert psignaturenode5 isa nullable PSignature
+                                       var pclosuredeclnode1: nullable AClosureDecl = new AClosureDecl.init_aclosuredecl(
                                                tkwwithnode2,
                                                null,
                                                tidnode4,
@@ -13816,9 +13829,9 @@ init do end
 end
 private class ReduceAction297
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -13826,14 +13839,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tkwbreaknode3 = nodearraylist2
-                                       assert tkwbreaknode3 isa TKwbreak
+                                       assert tkwbreaknode3 isa nullable TKwbreak
                                        var tidnode4 = nodearraylist4
-                                       assert tidnode4 isa TId
+                                       assert tidnode4 isa nullable TId
                                        var psignaturenode5 = nodearraylist5
-                                       assert psignaturenode5 isa PSignature
-                                       var pclosuredeclnode1 = new AClosureDecl.init_aclosuredecl(
+                                       assert psignaturenode5 isa nullable PSignature
+                                       var pclosuredeclnode1: nullable AClosureDecl = new AClosureDecl.init_aclosuredecl(
                                                tkwwithnode2,
                                                tkwbreaknode3,
                                                tidnode4,
@@ -13847,9 +13860,9 @@ init do end
 end
 private class ReduceAction298
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -13858,14 +13871,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tidnode4 = nodearraylist3
-                                       assert tidnode4 isa TId
+                                       assert tidnode4 isa nullable TId
                                        var psignaturenode5 = nodearraylist4
-                                       assert psignaturenode5 isa PSignature
+                                       assert psignaturenode5 isa nullable PSignature
                                        var pexprnode6 = nodearraylist6
-                                       assert pexprnode6 isa PExpr
-                                       var pclosuredeclnode1 = new AClosureDecl.init_aclosuredecl(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pclosuredeclnode1: nullable AClosureDecl = new AClosureDecl.init_aclosuredecl(
                                                tkwwithnode2,
                                                null,
                                                tidnode4,
@@ -13879,9 +13892,9 @@ init do end
 end
 private class ReduceAction299
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -13891,16 +13904,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tkwbreaknode3 = nodearraylist2
-                                       assert tkwbreaknode3 isa TKwbreak
+                                       assert tkwbreaknode3 isa nullable TKwbreak
                                        var tidnode4 = nodearraylist4
-                                       assert tidnode4 isa TId
+                                       assert tidnode4 isa nullable TId
                                        var psignaturenode5 = nodearraylist5
-                                       assert psignaturenode5 isa PSignature
+                                       assert psignaturenode5 isa nullable PSignature
                                        var pexprnode6 = nodearraylist7
-                                       assert pexprnode6 isa PExpr
-                                       var pclosuredeclnode1 = new AClosureDecl.init_aclosuredecl(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pclosuredeclnode1: nullable AClosureDecl = new AClosureDecl.init_aclosuredecl(
                                                tkwwithnode2,
                                                tkwbreaknode3,
                                                tidnode4,
@@ -13914,16 +13927,17 @@ init do end
 end
 private class ReduceAction300
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
-                                       var listnode3 = new Array[Object]
-                                       var tclassidnode2 = nodearraylist1
-                                       assert tclassidnode2 isa TClassid
-                                       var ptypenode1 = new AType.init_atype(
-                                               tclassidnode2,
-                                               listnode3
+                                       var listnode4 = new Array[Object]
+                                       var tclassidnode3 = nodearraylist1
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var ptypenode1: nullable AType = new AType.init_atype(
+                                               null,
+                                               tclassidnode3,
+                                               listnode4
                                        )
                                        node_list = ptypenode1
                                        p.push(p.go_to(22), node_list)
@@ -13932,45 +13946,104 @@ init do end
 end
 private class ReduceAction301
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var listnode4 = new Array[Object]
+                                       var tkwnullablenode2 = nodearraylist1
+                                       assert tkwnullablenode2 isa nullable TKwnullable
+                                       var tclassidnode3 = nodearraylist2
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var ptypenode1: nullable AType = new AType.init_atype(
+                                               tkwnullablenode2,
+                                               tclassidnode3,
+                                               listnode4
+                                       )
+                                       node_list = ptypenode1
+                                       p.push(p.go_to(22), node_list)
+       end
+init do end
+end
+private class ReduceAction302
+special ReduceAction
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
-                                       var listnode4 = new Array[Object]
-                                       var tclassidnode2 = nodearraylist1
-                                       assert tclassidnode2 isa TClassid
-                                       var listnode3 = nodearraylist4 
-                                       assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
-                                               if listnode4.is_empty then
-                                                       listnode4 = listnode3
+                                       var listnode5 = new Array[Object]
+                                       var tclassidnode3 = nodearraylist1
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var listnode4 = nodearraylist4
+                                       assert listnode4 isa Array[Object]
+#                                      if listnode4 != null then
+                                               if listnode5.is_empty then
+                                                       listnode5 = listnode4
                                                else
-                                                       listnode4.append(listnode3)
+                                                       listnode5.append(listnode4)
                                                end
-                                       end
-                                       var ptypenode1 = new AType.init_atype(
-                                               tclassidnode2,
-                                               listnode4
+#                                      end
+                                       var ptypenode1: nullable AType = new AType.init_atype(
+                                               null,
+                                               tclassidnode3,
+                                               listnode5
                                        )
                                        node_list = ptypenode1
                                        p.push(p.go_to(22), node_list)
        end
 init do end
 end
-private class ReduceAction302
+private class ReduceAction303
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist7 = p.pop
+                                       var nodearraylist6 = p.pop
+                                       var nodearraylist5 = p.pop
+                                       var nodearraylist4 = p.pop
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var listnode5 = new Array[Object]
+                                       var tkwnullablenode2 = nodearraylist1
+                                       assert tkwnullablenode2 isa nullable TKwnullable
+                                       var tclassidnode3 = nodearraylist2
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var listnode4 = nodearraylist5
+                                       assert listnode4 isa Array[Object]
+#                                      if listnode4 != null then
+                                               if listnode5.is_empty then
+                                                       listnode5 = listnode4
+                                               else
+                                                       listnode5.append(listnode4)
+                                               end
+#                                      end
+                                       var ptypenode1: nullable AType = new AType.init_atype(
+                                               tkwnullablenode2,
+                                               tclassidnode3,
+                                               listnode5
+                                       )
+                                       node_list = ptypenode1
+                                       p.push(p.go_to(22), node_list)
+       end
+init do end
+end
+private class ReduceAction304
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var ptypenode1 = nodearraylist1
-                                       assert ptypenode1 isa PType
+                                       assert ptypenode1 isa nullable PType
                                        if ptypenode1 != null then
                                                listnode2.add(ptypenode1)
                                        end
@@ -13979,92 +14052,92 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction303
+private class ReduceAction305
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var ptypenode1 = nodearraylist1
-                                       assert ptypenode1 isa PType
-                                       var listnode2 = nodearraylist2 
+                                       assert ptypenode1 isa nullable PType
+                                       var listnode2 = nodearraylist2
                                        assert listnode2 isa Array[Object]
                                        if ptypenode1 != null then
                                                listnode3.add(ptypenode1)
                                        end
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(23), node_list)
        end
 init do end
 end
-private class ReduceAction304
+private class ReduceAction306
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var ptypenode1 = nodearraylist3
-                                       assert ptypenode1 isa PType
+                                       assert ptypenode1 isa nullable PType
                                        node_list = ptypenode1
                                        p.push(p.go_to(24), node_list)
        end
 init do end
 end
-private class ReduceAction305
+private class ReduceAction307
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var ptypenode1 = nodearraylist3
-                                       assert ptypenode1 isa PType
+                                       assert ptypenode1 isa nullable PType
                                        node_list = ptypenode1
                                        p.push(p.go_to(25), node_list)
        end
 init do end
 end
-private class ReduceAction306
+private class ReduceAction308
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(26), node_list)
        end
 init do end
 end
-private class ReduceAction307
+private class ReduceAction309
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pexprnode2 = nodearraylist2
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        if pexprnode2 != null then
                                                listnode3.add(pexprnode2)
                                        end
-                                       var pexprnode1 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode1: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode3
                                        )
                                        node_list = pexprnode1
@@ -14072,11 +14145,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction308
+private class ReduceAction310
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -14084,20 +14157,20 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var pexprnode2 = nodearraylist2
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist3 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist3
                                        assert listnode3 isa Array[Object]
                                        if pexprnode2 != null then
                                                listnode4.add(pexprnode2)
                                        end
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var pexprnode1 = new ABlockExpr.init_ablockexpr(
+#                                      end
+                                       var pexprnode1: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode4
                                        )
                                        node_list = pexprnode1
@@ -14105,15 +14178,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction309
+private class ReduceAction311
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
-                                       var pexprnode1 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode1: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode2
                                        )
                                        node_list = pexprnode1
@@ -14121,14 +14194,14 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction310
+private class ReduceAction312
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
-                                       var pexprnode1 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode1: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode2
                                        )
                                        node_list = pexprnode1
@@ -14136,55 +14209,55 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction311
+private class ReduceAction313
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist2
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(27), node_list)
        end
 init do end
 end
-private class ReduceAction312
+private class ReduceAction314
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(28), node_list)
        end
 init do end
 end
-private class ReduceAction313
+private class ReduceAction315
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(28), node_list)
        end
 init do end
 end
-private class ReduceAction314
+private class ReduceAction316
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwreturnnode2 = nodearraylist1
-                                       assert tkwreturnnode2 isa TKwreturn
-                                       var pexprnode1 = new AReturnExpr.init_areturnexpr(
+                                       assert tkwreturnnode2 isa nullable TKwreturn
+                                       var pexprnode1: nullable AReturnExpr = new AReturnExpr.init_areturnexpr(
                                                tkwreturnnode2,
                                                null
                                        )
@@ -14193,18 +14266,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction315
+private class ReduceAction317
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwreturnnode2 = nodearraylist1
-                                       assert tkwreturnnode2 isa TKwreturn
+                                       assert tkwreturnnode2 isa nullable TKwreturn
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AReturnExpr.init_areturnexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AReturnExpr = new AReturnExpr.init_areturnexpr(
                                                tkwreturnnode2,
                                                pexprnode3
                                        )
@@ -14213,15 +14286,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction316
+private class ReduceAction318
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwbreaknode2 = nodearraylist1
-                                       assert tkwbreaknode2 isa TKwbreak
-                                       var pexprnode1 = new ABreakExpr.init_abreakexpr(
+                                       assert tkwbreaknode2 isa nullable TKwbreak
+                                       var pexprnode1: nullable ABreakExpr = new ABreakExpr.init_abreakexpr(
                                                tkwbreaknode2,
                                                null
                                        )
@@ -14230,18 +14303,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction317
+private class ReduceAction319
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwbreaknode2 = nodearraylist1
-                                       assert tkwbreaknode2 isa TKwbreak
+                                       assert tkwbreaknode2 isa nullable TKwbreak
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ABreakExpr.init_abreakexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ABreakExpr = new ABreakExpr.init_abreakexpr(
                                                tkwbreaknode2,
                                                pexprnode3
                                        )
@@ -14250,15 +14323,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction318
+private class ReduceAction320
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwabortnode2 = nodearraylist1
-                                       assert tkwabortnode2 isa TKwabort
-                                       var pexprnode1 = new AAbortExpr.init_aabortexpr(
+                                       assert tkwabortnode2 isa nullable TKwabort
+                                       var pexprnode1: nullable AAbortExpr = new AAbortExpr.init_aabortexpr(
                                                tkwabortnode2
                                        )
                                        node_list = pexprnode1
@@ -14266,15 +14339,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction319
+private class ReduceAction321
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwcontinuenode2 = nodearraylist1
-                                       assert tkwcontinuenode2 isa TKwcontinue
-                                       var pexprnode1 = new AContinueExpr.init_acontinueexpr(
+                                       assert tkwcontinuenode2 isa nullable TKwcontinue
+                                       var pexprnode1: nullable AContinueExpr = new AContinueExpr.init_acontinueexpr(
                                                tkwcontinuenode2,
                                                null
                                        )
@@ -14283,18 +14356,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction320
+private class ReduceAction322
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwcontinuenode2 = nodearraylist1
-                                       assert tkwcontinuenode2 isa TKwcontinue
+                                       assert tkwcontinuenode2 isa nullable TKwcontinue
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AContinueExpr.init_acontinueexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AContinueExpr = new AContinueExpr.init_acontinueexpr(
                                                tkwcontinuenode2,
                                                pexprnode3
                                        )
@@ -14303,76 +14376,76 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction321
+private class ReduceAction323
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(28), node_list)
        end
 init do end
 end
-private class ReduceAction322
+private class ReduceAction324
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(28), node_list)
        end
 init do end
 end
-private class ReduceAction323
+private class ReduceAction325
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(28), node_list)
        end
 init do end
 end
-private class ReduceAction324
+private class ReduceAction326
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(28), node_list)
        end
 init do end
 end
-private class ReduceAction325
+private class ReduceAction327
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(28), node_list)
        end
 init do end
 end
-private class ReduceAction326
+private class ReduceAction328
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -14381,19 +14454,19 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -14404,29 +14477,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction327
+private class ReduceAction329
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -14437,11 +14510,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction328
+private class ReduceAction330
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -14451,28 +14524,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -14483,39 +14556,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction329
+private class ReduceAction331
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -14526,26 +14599,26 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction330
+private class ReduceAction332
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var tkwsupernode3 = nodearraylist1
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                null,
                                                tkwsupernode3,
                                                listnode5
@@ -14555,29 +14628,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction331
+private class ReduceAction333
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pqualifiednode2 = nodearraylist1
-                                       assert pqualifiednode2 isa PQualified
+                                       assert pqualifiednode2 isa nullable PQualified
                                        var tkwsupernode3 = nodearraylist2
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist3 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist3
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                pqualifiednode2,
                                                tkwsupernode3,
                                                listnode5
@@ -14587,11 +14660,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction332
+private class ReduceAction334
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -14599,19 +14672,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwinitnode3 = nodearraylist4
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist5 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -14621,28 +14694,28 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction333
+private class ReduceAction335
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tkwinitnode3 = nodearraylist1
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -14652,15 +14725,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction334
+private class ReduceAction336
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pclosuredefnode1 = nodearraylist1
-                                       assert pclosuredefnode1 isa PClosureDef
+                                       assert pclosuredefnode1 isa nullable PClosureDef
                                        if pclosuredefnode1 != null then
                                                listnode2.add(pclosuredefnode1)
                                        end
@@ -14669,49 +14742,49 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction335
+private class ReduceAction337
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pclosuredefnode1 = nodearraylist1
-                                       assert pclosuredefnode1 isa PClosureDef
-                                       var listnode2 = nodearraylist2 
+                                       assert pclosuredefnode1 isa nullable PClosureDef
+                                       var listnode2 = nodearraylist2
                                        assert listnode2 isa Array[Object]
                                        if pclosuredefnode1 != null then
                                                listnode3.add(pclosuredefnode1)
                                        end
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(29), node_list)
        end
 init do end
 end
-private class ReduceAction336
+private class ReduceAction338
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tkwdonode4 = nodearraylist2
-                                       assert tkwdonode4 isa TKwdo
+                                       assert tkwdonode4 isa nullable TKwdo
                                        var pexprnode5 = nodearraylist3
-                                       assert pexprnode5 isa PExpr
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode3,
                                                tkwdonode4,
@@ -14722,32 +14795,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction337
+private class ReduceAction339
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
-                                       var listnode3 = nodearraylist2 
+                                       assert tkwwithnode2 isa nullable TKwwith
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var tkwdonode5 = nodearraylist3
-                                       assert tkwdonode5 isa TKwdo
+                                       assert tkwdonode5 isa nullable TKwdo
                                        var pexprnode6 = nodearraylist4
-                                       assert pexprnode6 isa PExpr
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode4,
                                                tkwdonode5,
@@ -14758,11 +14831,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction338
+private class ReduceAction340
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -14770,19 +14843,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tkwdonode4 = nodearraylist2
-                                       assert tkwdonode4 isa TKwdo
+                                       assert tkwdonode4 isa nullable TKwdo
                                        var listnode7 = new Array[Object]
                                        var pexprnode6 = nodearraylist4
-                                       assert pexprnode6 isa PExpr
+                                       assert pexprnode6 isa nullable PExpr
                                        if pexprnode6 != null then
                                                listnode7.add(pexprnode6)
                                        end
-                                       var pexprnode5 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode5: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode7
                                        )
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode3,
                                                tkwdonode4,
@@ -14793,11 +14866,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction339
+private class ReduceAction341
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -14806,28 +14879,28 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tkwdonode4 = nodearraylist2
-                                       assert tkwdonode4 isa TKwdo
+                                       assert tkwdonode4 isa nullable TKwdo
                                        var listnode8 = new Array[Object]
                                        var pexprnode6 = nodearraylist4
-                                       assert pexprnode6 isa PExpr
-                                       var listnode7 = nodearraylist5 
+                                       assert pexprnode6 isa nullable PExpr
+                                       var listnode7 = nodearraylist5
                                        assert listnode7 isa Array[Object]
                                        if pexprnode6 != null then
                                                listnode8.add(pexprnode6)
                                        end
-                                       if listnode7 != null then
+#                                      if listnode7 != null then
                                                if listnode8.is_empty then
                                                        listnode8 = listnode7
                                                else
                                                        listnode8.append(listnode7)
                                                end
-                                       end
-                                       var pexprnode5 = new ABlockExpr.init_ablockexpr(
+#                                      end
+                                       var pexprnode5: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode8
                                        )
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode3,
                                                tkwdonode4,
@@ -14838,11 +14911,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction340
+private class ReduceAction342
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -14851,28 +14924,28 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
-                                       var listnode3 = nodearraylist2 
+                                       assert tkwwithnode2 isa nullable TKwwith
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var tkwdonode5 = nodearraylist3
-                                       assert tkwdonode5 isa TKwdo
+                                       assert tkwdonode5 isa nullable TKwdo
                                        var listnode8 = new Array[Object]
                                        var pexprnode7 = nodearraylist5
-                                       assert pexprnode7 isa PExpr
+                                       assert pexprnode7 isa nullable PExpr
                                        if pexprnode7 != null then
                                                listnode8.add(pexprnode7)
                                        end
-                                       var pexprnode6 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode6: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode8
                                        )
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode4,
                                                tkwdonode5,
@@ -14883,11 +14956,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction341
+private class ReduceAction343
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -14897,37 +14970,37 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
-                                       var listnode3 = nodearraylist2 
+                                       assert tkwwithnode2 isa nullable TKwwith
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var tkwdonode5 = nodearraylist3
-                                       assert tkwdonode5 isa TKwdo
+                                       assert tkwdonode5 isa nullable TKwdo
                                        var listnode9 = new Array[Object]
                                        var pexprnode7 = nodearraylist5
-                                       assert pexprnode7 isa PExpr
-                                       var listnode8 = nodearraylist6 
+                                       assert pexprnode7 isa nullable PExpr
+                                       var listnode8 = nodearraylist6
                                        assert listnode8 isa Array[Object]
                                        if pexprnode7 != null then
                                                listnode9.add(pexprnode7)
                                        end
-                                       if listnode8 != null then
+#                                      if listnode8 != null then
                                                if listnode9.is_empty then
                                                        listnode9 = listnode8
                                                else
                                                        listnode9.append(listnode8)
                                                end
-                                       end
-                                       var pexprnode6 = new ABlockExpr.init_ablockexpr(
+#                                      end
+                                       var pexprnode6: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode9
                                        )
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode4,
                                                tkwdonode5,
@@ -14938,20 +15011,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction342
+private class ReduceAction344
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tkwdonode4 = nodearraylist2
-                                       assert tkwdonode4 isa TKwdo
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       assert tkwdonode4 isa nullable TKwdo
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode3,
                                                tkwdonode4,
@@ -14962,30 +15035,30 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction343
+private class ReduceAction345
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
-                                       var listnode3 = nodearraylist2 
+                                       assert tkwwithnode2 isa nullable TKwwith
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var tkwdonode5 = nodearraylist3
-                                       assert tkwdonode5 isa TKwdo
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       assert tkwdonode5 isa nullable TKwdo
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode4,
                                                tkwdonode5,
@@ -14996,18 +15069,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction344
+private class ReduceAction346
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwvarnode2 = nodearraylist1
-                                       assert tkwvarnode2 isa TKwvar
+                                       assert tkwvarnode2 isa nullable TKwvar
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
-                                       var pexprnode1 = new AVardeclExpr.init_avardeclexpr(
+                                       assert tidnode3 isa nullable TId
+                                       var pexprnode1: nullable AVardeclExpr = new AVardeclExpr.init_avardeclexpr(
                                                tkwvarnode2,
                                                tidnode3,
                                                null,
@@ -15019,21 +15092,21 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction345
+private class ReduceAction347
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwvarnode2 = nodearraylist1
-                                       assert tkwvarnode2 isa TKwvar
+                                       assert tkwvarnode2 isa nullable TKwvar
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var ptypenode4 = nodearraylist3
-                                       assert ptypenode4 isa PType
-                                       var pexprnode1 = new AVardeclExpr.init_avardeclexpr(
+                                       assert ptypenode4 isa nullable PType
+                                       var pexprnode1: nullable AVardeclExpr = new AVardeclExpr.init_avardeclexpr(
                                                tkwvarnode2,
                                                tidnode3,
                                                ptypenode4,
@@ -15045,25 +15118,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction346
+private class ReduceAction348
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwvarnode2 = nodearraylist1
-                                       assert tkwvarnode2 isa TKwvar
+                                       assert tkwvarnode2 isa nullable TKwvar
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var tassignnode5 = nodearraylist3
-                                       assert tassignnode5 isa TAssign
+                                       assert tassignnode5 isa nullable TAssign
                                        var pexprnode6 = nodearraylist5
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new AVardeclExpr.init_avardeclexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable AVardeclExpr = new AVardeclExpr.init_avardeclexpr(
                                                tkwvarnode2,
                                                tidnode3,
                                                null,
@@ -15075,11 +15148,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction347
+private class ReduceAction349
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -15087,16 +15160,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwvarnode2 = nodearraylist1
-                                       assert tkwvarnode2 isa TKwvar
+                                       assert tkwvarnode2 isa nullable TKwvar
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var ptypenode4 = nodearraylist3
-                                       assert ptypenode4 isa PType
+                                       assert ptypenode4 isa nullable PType
                                        var tassignnode5 = nodearraylist4
-                                       assert tassignnode5 isa TAssign
+                                       assert tassignnode5 isa nullable TAssign
                                        var pexprnode6 = nodearraylist6
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new AVardeclExpr.init_avardeclexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable AVardeclExpr = new AVardeclExpr.init_avardeclexpr(
                                                tkwvarnode2,
                                                tidnode3,
                                                ptypenode4,
@@ -15108,11 +15181,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction348
+private class ReduceAction350
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -15120,14 +15193,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tattridnode3 = nodearraylist4
-                                       assert tattridnode3 isa TAttrid
+                                       assert tattridnode3 isa nullable TAttrid
                                        var tassignnode4 = nodearraylist5
-                                       assert tassignnode4 isa TAssign
+                                       assert tassignnode4 isa nullable TAssign
                                        var pexprnode5 = nodearraylist6
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AAttrAssignExpr.init_aattrassignexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AAttrAssignExpr = new AAttrAssignExpr.init_aattrassignexpr(
                                                pexprnode2,
                                                tattridnode3,
                                                tassignnode4,
@@ -15138,23 +15211,23 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction349
+private class ReduceAction351
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode3 = nodearraylist1
-                                       assert tattridnode3 isa TAttrid
+                                       assert tattridnode3 isa nullable TAttrid
                                        var tassignnode4 = nodearraylist2
-                                       assert tassignnode4 isa TAssign
+                                       assert tassignnode4 isa nullable TAssign
                                        var pexprnode5 = nodearraylist3
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AAttrAssignExpr.init_aattrassignexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AAttrAssignExpr = new AAttrAssignExpr.init_aattrassignexpr(
                                                pexprnode2,
                                                tattridnode3,
                                                tassignnode4,
@@ -15165,11 +15238,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction350
+private class ReduceAction352
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -15179,23 +15252,23 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        var tassignnode6 = nodearraylist6
-                                       assert tassignnode6 isa TAssign
+                                       assert tassignnode6 isa nullable TAssign
                                        var pexprnode7 = nodearraylist7
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new ACallAssignExpr.init_acallassignexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable ACallAssignExpr = new ACallAssignExpr.init_acallassignexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -15207,34 +15280,34 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction351
+private class ReduceAction353
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        var tassignnode6 = nodearraylist3
-                                       assert tassignnode6 isa TAssign
+                                       assert tassignnode6 isa nullable TAssign
                                        var pexprnode7 = nodearraylist4
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new ACallAssignExpr.init_acallassignexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable ACallAssignExpr = new ACallAssignExpr.init_acallassignexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -15246,32 +15319,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction352
+private class ReduceAction354
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist2 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var tassignnode5 = nodearraylist3
-                                       assert tassignnode5 isa TAssign
+                                       assert tassignnode5 isa nullable TAssign
                                        var pexprnode6 = nodearraylist4
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new ABraAssignExpr.init_abraassignexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable ABraAssignExpr = new ABraAssignExpr.init_abraassignexpr(
                                                pexprnode2,
                                                listnode4,
                                                tassignnode5,
@@ -15282,11 +15355,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction353
+private class ReduceAction355
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -15294,14 +15367,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tattridnode3 = nodearraylist4
-                                       assert tattridnode3 isa TAttrid
+                                       assert tattridnode3 isa nullable TAttrid
                                        var passignopnode4 = nodearraylist5
-                                       assert passignopnode4 isa PAssignOp
+                                       assert passignopnode4 isa nullable PAssignOp
                                        var pexprnode5 = nodearraylist6
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AAttrReassignExpr.init_aattrreassignexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AAttrReassignExpr = new AAttrReassignExpr.init_aattrreassignexpr(
                                                pexprnode2,
                                                tattridnode3,
                                                passignopnode4,
@@ -15312,23 +15385,23 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction354
+private class ReduceAction356
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode3 = nodearraylist1
-                                       assert tattridnode3 isa TAttrid
+                                       assert tattridnode3 isa nullable TAttrid
                                        var passignopnode4 = nodearraylist2
-                                       assert passignopnode4 isa PAssignOp
+                                       assert passignopnode4 isa nullable PAssignOp
                                        var pexprnode5 = nodearraylist3
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AAttrReassignExpr.init_aattrreassignexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AAttrReassignExpr = new AAttrReassignExpr.init_aattrreassignexpr(
                                                pexprnode2,
                                                tattridnode3,
                                                passignopnode4,
@@ -15339,11 +15412,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction355
+private class ReduceAction357
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -15353,23 +15426,23 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        var passignopnode6 = nodearraylist6
-                                       assert passignopnode6 isa PAssignOp
+                                       assert passignopnode6 isa nullable PAssignOp
                                        var pexprnode7 = nodearraylist7
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new ACallReassignExpr.init_acallreassignexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable ACallReassignExpr = new ACallReassignExpr.init_acallreassignexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -15381,34 +15454,34 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction356
+private class ReduceAction358
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        var passignopnode6 = nodearraylist3
-                                       assert passignopnode6 isa PAssignOp
+                                       assert passignopnode6 isa nullable PAssignOp
                                        var pexprnode7 = nodearraylist4
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new ACallReassignExpr.init_acallreassignexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable ACallReassignExpr = new ACallReassignExpr.init_acallreassignexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -15420,32 +15493,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction357
+private class ReduceAction359
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist2 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var passignopnode5 = nodearraylist3
-                                       assert passignopnode5 isa PAssignOp
+                                       assert passignopnode5 isa nullable PAssignOp
                                        var pexprnode6 = nodearraylist4
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new ABraReassignExpr.init_abrareassignexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable ABraReassignExpr = new ABraReassignExpr.init_abrareassignexpr(
                                                pexprnode2,
                                                listnode4,
                                                passignopnode5,
@@ -15456,15 +15529,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction358
+private class ReduceAction360
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tpluseqnode2 = nodearraylist1
-                                       assert tpluseqnode2 isa TPluseq
-                                       var passignopnode1 = new APlusAssignOp.init_aplusassignop(
+                                       assert tpluseqnode2 isa nullable TPluseq
+                                       var passignopnode1: nullable APlusAssignOp = new APlusAssignOp.init_aplusassignop(
                                                tpluseqnode2
                                        )
                                        node_list = passignopnode1
@@ -15472,15 +15545,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction359
+private class ReduceAction361
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tminuseqnode2 = nodearraylist1
-                                       assert tminuseqnode2 isa TMinuseq
-                                       var passignopnode1 = new AMinusAssignOp.init_aminusassignop(
+                                       assert tminuseqnode2 isa nullable TMinuseq
+                                       var passignopnode1: nullable AMinusAssignOp = new AMinusAssignOp.init_aminusassignop(
                                                tminuseqnode2
                                        )
                                        node_list = passignopnode1
@@ -15488,18 +15561,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction360
+private class ReduceAction362
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwdonode2 = nodearraylist1
-                                       assert tkwdonode2 isa TKwdo
+                                       assert tkwdonode2 isa nullable TKwdo
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ADoExpr.init_adoexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ADoExpr = new ADoExpr.init_adoexpr(
                                                tkwdonode2,
                                                pexprnode3
                                        )
@@ -15508,11 +15581,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction361
+private class ReduceAction363
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -15522,14 +15595,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var pexprnode4 = nodearraylist6
-                                       assert pexprnode4 isa PExpr
+                                       assert pexprnode4 isa nullable PExpr
                                        var pexprnode5 = nodearraylist8
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AIfExpr.init_aifexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AIfExpr = new AIfExpr.init_aifexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                pexprnode4,
@@ -15540,11 +15613,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction362
+private class ReduceAction364
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -15552,12 +15625,12 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var pexprnode4 = nodearraylist6
-                                       assert pexprnode4 isa PExpr
-                                       var pexprnode1 = new AIfExpr.init_aifexpr(
+                                       assert pexprnode4 isa nullable PExpr
+                                       var pexprnode1: nullable AIfExpr = new AIfExpr.init_aifexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                pexprnode4,
@@ -15568,11 +15641,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction363
+private class ReduceAction365
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -15583,21 +15656,21 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var listnode6 = new Array[Object]
                                        var pexprnode5 = nodearraylist7
-                                       assert pexprnode5 isa PExpr
+                                       assert pexprnode5 isa nullable PExpr
                                        if pexprnode5 != null then
                                                listnode6.add(pexprnode5)
                                        end
-                                       var pexprnode4 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode4: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode6
                                        )
                                        var pexprnode7 = nodearraylist9
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new AIfExpr.init_aifexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable AIfExpr = new AIfExpr.init_aifexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                pexprnode4,
@@ -15608,11 +15681,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction364
+private class ReduceAction366
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -15624,30 +15697,30 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var listnode7 = new Array[Object]
                                        var pexprnode5 = nodearraylist7
-                                       assert pexprnode5 isa PExpr
-                                       var listnode6 = nodearraylist8 
+                                       assert pexprnode5 isa nullable PExpr
+                                       var listnode6 = nodearraylist8
                                        assert listnode6 isa Array[Object]
                                        if pexprnode5 != null then
                                                listnode7.add(pexprnode5)
                                        end
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode4 = new ABlockExpr.init_ablockexpr(
+#                                      end
+                                       var pexprnode4: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode7
                                        )
                                        var pexprnode8 = nodearraylist10
-                                       assert pexprnode8 isa PExpr
-                                       var pexprnode1 = new AIfExpr.init_aifexpr(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var pexprnode1: nullable AIfExpr = new AIfExpr.init_aifexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                pexprnode4,
@@ -15658,11 +15731,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction365
+private class ReduceAction367
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -15670,12 +15743,12 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var pexprnode5 = nodearraylist6
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AIfExpr.init_aifexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AIfExpr = new AIfExpr.init_aifexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                null,
@@ -15686,11 +15759,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction366
+private class ReduceAction368
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -15699,12 +15772,12 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var pexprnode5 = nodearraylist7
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AIfExpr.init_aifexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AIfExpr = new AIfExpr.init_aifexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                null,
@@ -15715,36 +15788,36 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction367
+private class ReduceAction369
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist2
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(37), node_list)
        end
 init do end
 end
-private class ReduceAction368
+private class ReduceAction370
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        node_list = null
                                        p.push(p.go_to(37), node_list)
        end
 init do end
 end
-private class ReduceAction369
+private class ReduceAction371
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -15752,14 +15825,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwwhilenode2 = nodearraylist1
-                                       assert tkwwhilenode2 isa TKwwhile
+                                       assert tkwwhilenode2 isa nullable TKwwhile
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tkwdonode4 = nodearraylist5
-                                       assert tkwdonode4 isa TKwdo
+                                       assert tkwdonode4 isa nullable TKwdo
                                        var pexprnode5 = nodearraylist6
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AWhileExpr.init_awhileexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AWhileExpr = new AWhileExpr.init_awhileexpr(
                                                tkwwhilenode2,
                                                pexprnode3,
                                                tkwdonode4,
@@ -15770,11 +15843,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction370
+private class ReduceAction372
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -15786,16 +15859,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwfornode2 = nodearraylist1
-                                       assert tkwfornode2 isa TKwfor
+                                       assert tkwfornode2 isa nullable TKwfor
                                        var tidnode3 = nodearraylist3
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var pexprnode4 = nodearraylist7
-                                       assert pexprnode4 isa PExpr
+                                       assert pexprnode4 isa nullable PExpr
                                        var tkwdonode5 = nodearraylist9
-                                       assert tkwdonode5 isa TKwdo
+                                       assert tkwdonode5 isa nullable TKwdo
                                        var pexprnode6 = nodearraylist10
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new AForExpr.init_aforexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable AForExpr = new AForExpr.init_aforexpr(
                                                tkwfornode2,
                                                tidnode3,
                                                pexprnode4,
@@ -15807,18 +15880,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction371
+private class ReduceAction373
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwassertnode2 = nodearraylist1
-                                       assert tkwassertnode2 isa TKwassert
+                                       assert tkwassertnode2 isa nullable TKwassert
                                        var pexprnode4 = nodearraylist2
-                                       assert pexprnode4 isa PExpr
-                                       var pexprnode1 = new AAssertExpr.init_aassertexpr(
+                                       assert pexprnode4 isa nullable PExpr
+                                       var pexprnode1: nullable AAssertExpr = new AAssertExpr.init_aassertexpr(
                                                tkwassertnode2,
                                                null,
                                                pexprnode4
@@ -15828,21 +15901,21 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction372
+private class ReduceAction374
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwassertnode2 = nodearraylist1
-                                       assert tkwassertnode2 isa TKwassert
+                                       assert tkwassertnode2 isa nullable TKwassert
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var pexprnode4 = nodearraylist3
-                                       assert pexprnode4 isa PExpr
-                                       var pexprnode1 = new AAssertExpr.init_aassertexpr(
+                                       assert pexprnode4 isa nullable PExpr
+                                       var pexprnode1: nullable AAssertExpr = new AAssertExpr.init_aassertexpr(
                                                tkwassertnode2,
                                                tidnode3,
                                                pexprnode4
@@ -15852,38 +15925,38 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction373
+private class ReduceAction375
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tidnode1 = nodearraylist1
-                                       assert tidnode1 isa TId
+                                       assert tidnode1 isa nullable TId
                                        node_list = tidnode1
                                        p.push(p.go_to(41), node_list)
        end
 init do end
 end
-private class ReduceAction374
+private class ReduceAction376
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(42), node_list)
        end
 init do end
 end
-private class ReduceAction375
+private class ReduceAction377
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -15893,28 +15966,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -15925,39 +15998,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction376
+private class ReduceAction378
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -15968,37 +16041,37 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction377
+private class ReduceAction379
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist2 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist3 
+#                                      end
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ABraExpr.init_abraexpr(
+#                                      end
+                                       var pexprnode1: nullable ABraExpr = new ABraExpr.init_abraexpr(
                                                pexprnode2,
                                                listnode4,
                                                listnode6
@@ -16008,24 +16081,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction378
+private class ReduceAction380
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(43), node_list)
        end
 init do end
 end
-private class ReduceAction379
+private class ReduceAction381
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -16038,18 +16111,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tkwthennode4 = nodearraylist5
-                                       assert tkwthennode4 isa TKwthen
+                                       assert tkwthennode4 isa nullable TKwthen
                                        var pexprnode5 = nodearraylist7
-                                       assert pexprnode5 isa PExpr
+                                       assert pexprnode5 isa nullable PExpr
                                        var tkwelsenode6 = nodearraylist9
-                                       assert tkwelsenode6 isa TKwelse
+                                       assert tkwelsenode6 isa nullable TKwelse
                                        var pexprnode7 = nodearraylist11
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new AIfexprExpr.init_aifexprexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable AIfexprExpr = new AIfexprExpr.init_aifexprexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                tkwthennode4,
@@ -16062,33 +16135,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction380
+private class ReduceAction382
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(44), node_list)
        end
 init do end
 end
-private class ReduceAction381
+private class ReduceAction383
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOrExpr.init_aorexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOrExpr = new AOrExpr.init_aorexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16097,20 +16170,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction382
+private class ReduceAction384
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AAndExpr.init_aandexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AAndExpr = new AAndExpr.init_aandexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16119,32 +16192,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction383
+private class ReduceAction385
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(45), node_list)
        end
 init do end
 end
-private class ReduceAction384
+private class ReduceAction386
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwnotnode2 = nodearraylist1
-                                       assert tkwnotnode2 isa TKwnot
+                                       assert tkwnotnode2 isa nullable TKwnot
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ANotExpr.init_anotexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ANotExpr = new ANotExpr.init_anotexpr(
                                                tkwnotnode2,
                                                pexprnode3
                                        )
@@ -16153,33 +16226,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction385
+private class ReduceAction387
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(46), node_list)
        end
 init do end
 end
-private class ReduceAction386
+private class ReduceAction388
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AEqExpr.init_aeqexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AEqExpr = new AEqExpr.init_aeqexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16188,20 +16261,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction387
+private class ReduceAction389
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AEeExpr.init_aeeexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AEeExpr = new AEeExpr.init_aeeexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16210,20 +16283,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction388
+private class ReduceAction390
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ANeExpr.init_aneexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ANeExpr = new ANeExpr.init_aneexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16232,20 +16305,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction389
+private class ReduceAction391
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ALtExpr.init_altexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ALtExpr = new ALtExpr.init_altexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16254,20 +16327,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction390
+private class ReduceAction392
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ALeExpr.init_aleexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ALeExpr = new ALeExpr.init_aleexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16276,20 +16349,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction391
+private class ReduceAction393
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AGtExpr.init_agtexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AGtExpr = new AGtExpr.init_agtexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16298,20 +16371,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction392
+private class ReduceAction394
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AGeExpr.init_ageexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AGeExpr = new AGeExpr.init_ageexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16320,20 +16393,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction393
+private class ReduceAction395
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AStarshipExpr.init_astarshipexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AStarshipExpr = new AStarshipExpr.init_astarshipexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16342,20 +16415,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction394
+private class ReduceAction396
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var ptypenode3 = nodearraylist4
-                                       assert ptypenode3 isa PType
-                                       var pexprnode1 = new AIsaExpr.init_aisaexpr(
+                                       assert ptypenode3 isa nullable PType
+                                       var pexprnode1: nullable AIsaExpr = new AIsaExpr.init_aisaexpr(
                                                pexprnode2,
                                                ptypenode3
                                        )
@@ -16364,33 +16437,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction395
+private class ReduceAction397
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(47), node_list)
        end
 init do end
 end
-private class ReduceAction396
+private class ReduceAction398
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new APlusExpr.init_aplusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable APlusExpr = new APlusExpr.init_aplusexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16399,20 +16472,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction397
+private class ReduceAction399
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AMinusExpr.init_aminusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AMinusExpr = new AMinusExpr.init_aminusexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16421,33 +16494,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction398
+private class ReduceAction400
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(48), node_list)
        end
 init do end
 end
-private class ReduceAction399
+private class ReduceAction401
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AStarExpr.init_astarexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AStarExpr = new AStarExpr.init_astarexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16456,20 +16529,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction400
+private class ReduceAction402
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ASlashExpr.init_aslashexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ASlashExpr = new ASlashExpr.init_aslashexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16478,20 +16551,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction401
+private class ReduceAction403
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new APercentExpr.init_apercentexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable APercentExpr = new APercentExpr.init_apercentexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16500,32 +16573,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction402
+private class ReduceAction404
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(49), node_list)
        end
 init do end
 end
-private class ReduceAction403
+private class ReduceAction405
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tminusnode2 = nodearraylist1
-                                       assert tminusnode2 isa TMinus
+                                       assert tminusnode2 isa nullable TMinus
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AUminusExpr.init_auminusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AUminusExpr = new AUminusExpr.init_auminusexpr(
                                                tminusnode2,
                                                pexprnode3
                                        )
@@ -16534,19 +16607,19 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction404
+private class ReduceAction406
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwoncenode2 = nodearraylist1
-                                       assert tkwoncenode2 isa TKwonce
+                                       assert tkwoncenode2 isa nullable TKwonce
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOnceExpr.init_aonceexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOnceExpr = new AOnceExpr.init_aonceexpr(
                                                tkwoncenode2,
                                                pexprnode3
                                        )
@@ -16555,43 +16628,43 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction405
+private class ReduceAction407
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(50), node_list)
        end
 init do end
 end
-private class ReduceAction406
+private class ReduceAction408
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var tkwnewnode2 = nodearraylist1
-                                       assert tkwnewnode2 isa TKwnew
+                                       assert tkwnewnode2 isa nullable TKwnew
                                        var ptypenode3 = nodearraylist3
-                                       assert ptypenode3 isa PType
-                                       var listnode5 = nodearraylist4 
+                                       assert ptypenode3 isa nullable PType
+                                       var listnode5 = nodearraylist4
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ANewExpr.init_anewexpr(
+#                                      end
+                                       var pexprnode1: nullable ANewExpr = new ANewExpr.init_anewexpr(
                                                tkwnewnode2,
                                                ptypenode3,
                                                null,
@@ -16602,20 +16675,69 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction407
+private class ReduceAction409
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist5 = p.pop
+                                       var nodearraylist4 = p.pop
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var tkwissetnode2 = nodearraylist1
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3 = nodearraylist2
+                                       assert pexprnode3 isa nullable PExpr
+                                       var tattridnode4 = nodearraylist5
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
+                                               tkwissetnode2,
+                                               pexprnode3,
+                                               tattridnode4
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(50), node_list)
+       end
+init do end
+end
+private class ReduceAction410
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var tkwissetnode2 = nodearraylist1
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       )
+                                       var tattridnode4 = nodearraylist2
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
+                                               tkwissetnode2,
+                                               pexprnode3,
+                                               tattridnode4
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(50), node_list)
+       end
+init do end
+end
+private class ReduceAction411
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tattridnode3 = nodearraylist4
-                                       assert tattridnode3 isa TAttrid
-                                       var pexprnode1 = new AAttrExpr.init_aattrexpr(
+                                       assert tattridnode3 isa nullable TAttrid
+                                       var pexprnode1: nullable AAttrExpr = new AAttrExpr.init_aattrexpr(
                                                pexprnode2,
                                                tattridnode3
                                        )
@@ -16624,17 +16746,17 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction408
+private class ReduceAction412
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode3 = nodearraylist1
-                                       assert tattridnode3 isa TAttrid
-                                       var pexprnode1 = new AAttrExpr.init_aattrexpr(
+                                       assert tattridnode3 isa nullable TAttrid
+                                       var pexprnode1: nullable AAttrExpr = new AAttrExpr.init_aattrexpr(
                                                pexprnode2,
                                                tattridnode3
                                        )
@@ -16643,11 +16765,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction409
+private class ReduceAction413
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -16656,19 +16778,19 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -16679,29 +16801,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction410
+private class ReduceAction414
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -16712,26 +16834,26 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction411
+private class ReduceAction415
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var tkwsupernode3 = nodearraylist1
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                null,
                                                tkwsupernode3,
                                                listnode5
@@ -16741,29 +16863,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction412
+private class ReduceAction416
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pqualifiednode2 = nodearraylist1
-                                       assert pqualifiednode2 isa PQualified
+                                       assert pqualifiednode2 isa nullable PQualified
                                        var tkwsupernode3 = nodearraylist2
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist3 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist3
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                pqualifiednode2,
                                                tkwsupernode3,
                                                listnode5
@@ -16773,11 +16895,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction413
+private class ReduceAction417
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -16785,19 +16907,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwinitnode3 = nodearraylist4
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist5 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -16807,28 +16929,28 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction414
+private class ReduceAction418
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tkwinitnode3 = nodearraylist1
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -16838,27 +16960,27 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction415
+private class ReduceAction419
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist2 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var pexprnode1 = new ABraExpr.init_abraexpr(
+#                                      end
+                                       var pexprnode1: nullable ABraExpr = new ABraExpr.init_abraexpr(
                                                pexprnode2,
                                                listnode4,
                                                listnode5
@@ -16868,11 +16990,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction416
+private class ReduceAction420
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -16882,21 +17004,21 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var tkwnewnode2 = nodearraylist1
-                                       assert tkwnewnode2 isa TKwnew
+                                       assert tkwnewnode2 isa nullable TKwnew
                                        var ptypenode3 = nodearraylist3
-                                       assert ptypenode3 isa PType
+                                       assert ptypenode3 isa nullable PType
                                        var tidnode4 = nodearraylist6
-                                       assert tidnode4 isa TId
-                                       var listnode5 = nodearraylist7 
+                                       assert tidnode4 isa nullable TId
+                                       var listnode5 = nodearraylist7
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ANewExpr.init_anewexpr(
+#                                      end
+                                       var pexprnode1: nullable ANewExpr = new ANewExpr.init_anewexpr(
                                                tkwnewnode2,
                                                ptypenode3,
                                                tidnode4,
@@ -16907,11 +17029,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction417
+private class ReduceAction421
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -16922,10 +17044,10 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist3
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist7
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ACrangeExpr.init_acrangeexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ACrangeExpr = new ACrangeExpr.init_acrangeexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16934,11 +17056,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction418
+private class ReduceAction422
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -16949,10 +17071,10 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist3
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist7
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOrangeExpr.init_aorangeexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOrangeExpr = new AOrangeExpr.init_aorangeexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -16961,23 +17083,23 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction419
+private class ReduceAction423
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
-                                       var pexprnode1 = new AArrayExpr.init_aarrayexpr(
+#                                      end
+                                       var pexprnode1: nullable AArrayExpr = new AArrayExpr.init_aarrayexpr(
                                                listnode3
                                        )
                                        node_list = pexprnode1
@@ -16985,15 +17107,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction420
+private class ReduceAction424
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwselfnode2 = nodearraylist1
-                                       assert tkwselfnode2 isa TKwself
-                                       var pexprnode1 = new ASelfExpr.init_aselfexpr(
+                                       assert tkwselfnode2 isa nullable TKwself
+                                       var pexprnode1: nullable ASelfExpr = new ASelfExpr.init_aselfexpr(
                                                tkwselfnode2
                                        )
                                        node_list = pexprnode1
@@ -17001,15 +17123,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction421
+private class ReduceAction425
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwtruenode2 = nodearraylist1
-                                       assert tkwtruenode2 isa TKwtrue
-                                       var pexprnode1 = new ATrueExpr.init_atrueexpr(
+                                       assert tkwtruenode2 isa nullable TKwtrue
+                                       var pexprnode1: nullable ATrueExpr = new ATrueExpr.init_atrueexpr(
                                                tkwtruenode2
                                        )
                                        node_list = pexprnode1
@@ -17017,15 +17139,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction422
+private class ReduceAction426
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwfalsenode2 = nodearraylist1
-                                       assert tkwfalsenode2 isa TKwfalse
-                                       var pexprnode1 = new AFalseExpr.init_afalseexpr(
+                                       assert tkwfalsenode2 isa nullable TKwfalse
+                                       var pexprnode1: nullable AFalseExpr = new AFalseExpr.init_afalseexpr(
                                                tkwfalsenode2
                                        )
                                        node_list = pexprnode1
@@ -17033,15 +17155,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction423
+private class ReduceAction427
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwnullnode2 = nodearraylist1
-                                       assert tkwnullnode2 isa TKwnull
-                                       var pexprnode1 = new ANullExpr.init_anullexpr(
+                                       assert tkwnullnode2 isa nullable TKwnull
+                                       var pexprnode1: nullable ANullExpr = new ANullExpr.init_anullexpr(
                                                tkwnullnode2
                                        )
                                        node_list = pexprnode1
@@ -17049,15 +17171,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction424
+private class ReduceAction428
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tnumbernode2 = nodearraylist1
-                                       assert tnumbernode2 isa TNumber
-                                       var pexprnode1 = new AIntExpr.init_aintexpr(
+                                       assert tnumbernode2 isa nullable TNumber
+                                       var pexprnode1: nullable AIntExpr = new AIntExpr.init_aintexpr(
                                                tnumbernode2
                                        )
                                        node_list = pexprnode1
@@ -17065,15 +17187,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction425
+private class ReduceAction429
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tfloatnode2 = nodearraylist1
-                                       assert tfloatnode2 isa TFloat
-                                       var pexprnode1 = new AFloatExpr.init_afloatexpr(
+                                       assert tfloatnode2 isa nullable TFloat
+                                       var pexprnode1: nullable AFloatExpr = new AFloatExpr.init_afloatexpr(
                                                tfloatnode2
                                        )
                                        node_list = pexprnode1
@@ -17081,15 +17203,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction426
+private class ReduceAction430
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tcharnode2 = nodearraylist1
-                                       assert tcharnode2 isa TChar
-                                       var pexprnode1 = new ACharExpr.init_acharexpr(
+                                       assert tcharnode2 isa nullable TChar
+                                       var pexprnode1: nullable ACharExpr = new ACharExpr.init_acharexpr(
                                                tcharnode2
                                        )
                                        node_list = pexprnode1
@@ -17097,15 +17219,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction427
+private class ReduceAction431
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tstringnode2 = nodearraylist1
-                                       assert tstringnode2 isa TString
-                                       var pexprnode1 = new AStringExpr.init_astringexpr(
+                                       assert tstringnode2 isa nullable TString
+                                       var pexprnode1: nullable AStringExpr = new AStringExpr.init_astringexpr(
                                                tstringnode2
                                        )
                                        node_list = pexprnode1
@@ -17113,39 +17235,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction428
+private class ReduceAction432
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(51), node_list)
        end
 init do end
 end
-private class ReduceAction429
+private class ReduceAction433
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist2
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(51), node_list)
        end
 init do end
 end
-private class ReduceAction430
+private class ReduceAction434
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -17157,12 +17279,12 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwasnode3 = nodearraylist4
-                                       assert tkwasnode3 isa TKwas
+                                       assert tkwasnode3 isa nullable TKwas
                                        var ptypenode4 = nodearraylist8
-                                       assert ptypenode4 isa PType
-                                       var pexprnode1 = new AAsCastExpr.init_aascastexpr(
+                                       assert ptypenode4 isa nullable PType
+                                       var pexprnode1: nullable AAsCastExpr = new AAsCastExpr.init_aascastexpr(
                                                pexprnode2,
                                                tkwasnode3,
                                                ptypenode4
@@ -17172,29 +17294,65 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction431
+private class ReduceAction435
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
-                                       var nodearraylist2 = p.pop
-                                       var nodearraylist1 = p.pop
-                                       var listnode4 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
-                                       assert listnode2 isa Array[Object]
-                                       var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       if listnode2 != null then
-                                               if listnode4.is_empty then
-                                                       listnode4 = listnode2
-                                               else
-                                                       listnode4.append(listnode2)
+                                       var node_list: nullable Object = null
+                                       var nodearraylist12 = p.pop
+                                       var nodearraylist11 = p.pop
+                                       var nodearraylist10 = p.pop
+                                       var nodearraylist9 = p.pop
+                                       var nodearraylist8 = p.pop
+                                       var nodearraylist7 = p.pop
+                                       var nodearraylist6 = p.pop
+                                       var nodearraylist5 = p.pop
+                                       var nodearraylist4 = p.pop
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var pexprnode2 = nodearraylist1
+                                       assert pexprnode2 isa nullable PExpr
+                                       var tkwasnode3 = nodearraylist4
+                                       assert tkwasnode3 isa nullable TKwas
+                                       var tkwnotnode4 = nodearraylist8
+                                       assert tkwnotnode4 isa nullable TKwnot
+                                       var tkwnullnode5 = nodearraylist10
+                                       assert tkwnullnode5 isa nullable TKwnull
+                                       var pexprnode1: nullable AAsNotnullExpr = new AAsNotnullExpr.init_aasnotnullexpr(
+                                               pexprnode2,
+                                               tkwasnode3,
+                                               tkwnotnode4,
+                                               tkwnullnode5
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(51), node_list)
+       end
+init do end
+end
+private class ReduceAction436
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var listnode4 = new Array[Object]
+                                       var listnode2 = nodearraylist1
+                                       assert listnode2 isa Array[Object]
+                                       var pexprnode3 = nodearraylist2
+                                       assert pexprnode3 isa nullable PExpr
+#                                      if listnode2 != null then
+                                               if listnode4.is_empty then
+                                                       listnode4 = listnode2
+                                               else
+                                                       listnode4.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        if pexprnode3 != null then
                                                listnode4.add(pexprnode3)
                                        end
-                                       var pexprnode1 = new ASuperstringExpr.init_asuperstringexpr(
+                                       var pexprnode1: nullable ASuperstringExpr = new ASuperstringExpr.init_asuperstringexpr(
                                                listnode4
                                        )
                                        node_list = pexprnode1
@@ -17202,39 +17360,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction432
+private class ReduceAction437
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       var listnode3 = nodearraylist2 
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
                                        var pexprnode4 = nodearraylist3
-                                       assert pexprnode4 isa PExpr
-                                       if listnode2 != null then
+                                       assert pexprnode4 isa nullable PExpr
+#                                      if listnode2 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode2
                                                else
                                                        listnode5.append(listnode2)
                                                end
-                                       end
-                                       if listnode3 != null then
+#                                      end
+#                                      if listnode3 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode3
                                                else
                                                        listnode5.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        if pexprnode4 != null then
                                                listnode5.add(pexprnode4)
                                        end
-                                       var pexprnode1 = new ASuperstringExpr.init_asuperstringexpr(
+                                       var pexprnode1: nullable ASuperstringExpr = new ASuperstringExpr.init_asuperstringexpr(
                                                listnode5
                                        )
                                        node_list = pexprnode1
@@ -17242,20 +17400,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction433
+private class ReduceAction438
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        var pexprnode2 = nodearraylist3
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        if pexprnode1 != null then
                                                listnode3.add(pexprnode1)
                                        end
@@ -17267,15 +17425,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction434
+private class ReduceAction439
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tstartstringnode2 = nodearraylist1
-                                       assert tstartstringnode2 isa TStartString
-                                       var pexprnode1 = new AStartStringExpr.init_astartstringexpr(
+                                       assert tstartstringnode2 isa nullable TStartString
+                                       var pexprnode1: nullable AStartStringExpr = new AStartStringExpr.init_astartstringexpr(
                                                tstartstringnode2
                                        )
                                        node_list = pexprnode1
@@ -17283,20 +17441,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction435
+private class ReduceAction440
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        var pexprnode2 = nodearraylist3
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        if pexprnode1 != null then
                                                listnode3.add(pexprnode1)
                                        end
@@ -17308,15 +17466,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction436
+private class ReduceAction441
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tmidstringnode2 = nodearraylist1
-                                       assert tmidstringnode2 isa TMidString
-                                       var pexprnode1 = new AMidStringExpr.init_amidstringexpr(
+                                       assert tmidstringnode2 isa nullable TMidString
+                                       var pexprnode1: nullable AMidStringExpr = new AMidStringExpr.init_amidstringexpr(
                                                tmidstringnode2
                                        )
                                        node_list = pexprnode1
@@ -17324,15 +17482,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction437
+private class ReduceAction442
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tendstringnode2 = nodearraylist1
-                                       assert tendstringnode2 isa TEndString
-                                       var pexprnode1 = new AEndStringExpr.init_aendstringexpr(
+                                       assert tendstringnode2 isa nullable TEndString
+                                       var pexprnode1: nullable AEndStringExpr = new AEndStringExpr.init_aendstringexpr(
                                                tendstringnode2
                                        )
                                        node_list = pexprnode1
@@ -17340,11 +17498,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction438
+private class ReduceAction443
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -17352,7 +17510,7 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pexprnode1 = nodearraylist3
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        if pexprnode1 != null then
                                                listnode2.add(pexprnode1)
                                        end
@@ -17361,11 +17519,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction439
+private class ReduceAction444
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -17374,29 +17532,29 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pexprnode1 = nodearraylist3
-                                       assert pexprnode1 isa PExpr
-                                       var listnode2 = nodearraylist5 
+                                       assert pexprnode1 isa nullable PExpr
+                                       var listnode2 = nodearraylist5
                                        assert listnode2 isa Array[Object]
                                        if pexprnode1 != null then
                                                listnode3.add(pexprnode1)
                                        end
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(58), node_list)
        end
 init do end
 end
-private class ReduceAction440
+private class ReduceAction445
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
@@ -17406,22 +17564,22 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction441
+private class ReduceAction446
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var listnode1 = new Array[Object]
                                        node_list = listnode1
                                        p.push(p.go_to(58), node_list)
        end
 init do end
 end
-private class ReduceAction442
+private class ReduceAction447
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -17429,7 +17587,7 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pexprnode1 = nodearraylist3
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        if pexprnode1 != null then
                                                listnode2.add(pexprnode1)
                                        end
@@ -17438,11 +17596,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction443
+private class ReduceAction448
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -17451,33 +17609,33 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pexprnode1 = nodearraylist3
-                                       assert pexprnode1 isa PExpr
-                                       var listnode2 = nodearraylist5 
+                                       assert pexprnode1 isa nullable PExpr
+                                       var listnode2 = nodearraylist5
                                        assert listnode2 isa Array[Object]
                                        if pexprnode1 != null then
                                                listnode3.add(pexprnode1)
                                        end
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(59), node_list)
        end
 init do end
 end
-private class ReduceAction444
+private class ReduceAction449
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        if pexprnode1 != null then
                                                listnode2.add(pexprnode1)
                                        end
@@ -17486,11 +17644,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction445
+private class ReduceAction450
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
@@ -17500,22 +17658,22 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction446
+private class ReduceAction451
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var listnode1 = new Array[Object]
                                        node_list = listnode1
                                        p.push(p.go_to(59), node_list)
        end
 init do end
 end
-private class ReduceAction447
+private class ReduceAction452
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -17523,7 +17681,7 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pexprnode1 = nodearraylist3
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        if pexprnode1 != null then
                                                listnode2.add(pexprnode1)
                                        end
@@ -17532,11 +17690,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction448
+private class ReduceAction453
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -17545,49 +17703,49 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pexprnode1 = nodearraylist3
-                                       assert pexprnode1 isa PExpr
-                                       var listnode2 = nodearraylist5 
+                                       assert pexprnode1 isa nullable PExpr
+                                       var listnode2 = nodearraylist5
                                        assert listnode2 isa Array[Object]
                                        if pexprnode1 != null then
                                                listnode3.add(pexprnode1)
                                        end
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(60), node_list)
        end
 init do end
 end
-private class ReduceAction449
+private class ReduceAction454
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist3
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(61), node_list)
        end
 init do end
 end
-private class ReduceAction450
+private class ReduceAction455
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var tidnode1 = nodearraylist1
-                                       assert tidnode1 isa TId
+                                       assert tidnode1 isa nullable TId
                                        if tidnode1 != null then
                                                listnode2.add(tidnode1)
                                        end
@@ -17596,28 +17754,28 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction451
+private class ReduceAction456
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var tidnode2 = nodearraylist5
-                                       assert tidnode2 isa TId
-                                       if listnode1 != null then
+                                       assert tidnode2 isa nullable TId
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if tidnode2 != null then
                                                listnode3.add(tidnode2)
                                        end
@@ -17626,16 +17784,16 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction452
+private class ReduceAction457
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var tclassidnode3 = nodearraylist1
-                                       assert tclassidnode3 isa TClassid
-                                       var pqualifiednode1 = new AQualified.init_aqualified(
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var pqualifiednode1: nullable AQualified = new AQualified.init_aqualified(
                                                listnode2,
                                                tclassidnode3
                                        )
@@ -17644,26 +17802,26 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction453
+private class ReduceAction458
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        var tclassidnode4 = nodearraylist2
-                                       assert tclassidnode4 isa TClassid
-                                       var pqualifiednode1 = new AQualified.init_aqualified(
+                                       assert tclassidnode4 isa nullable TClassid
+                                       var pqualifiednode1: nullable AQualified = new AQualified.init_aqualified(
                                                listnode3,
                                                tclassidnode4
                                        )
@@ -17672,23 +17830,23 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction454
+private class ReduceAction459
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
-                                       var pqualifiednode1 = new AQualified.init_aqualified(
+#                                      end
+                                       var pqualifiednode1: nullable AQualified = new AQualified.init_aqualified(
                                                listnode3,
                                                null
                                        )
@@ -17697,73 +17855,73 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction455
+private class ReduceAction460
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tidnode1 = nodearraylist1
-                                       assert tidnode1 isa TId
+                                       assert tidnode1 isa nullable TId
                                        node_list = tidnode1
                                        p.push(p.go_to(64), node_list)
        end
 init do end
 end
-private class ReduceAction456
+private class ReduceAction461
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tclassidnode1 = nodearraylist1
-                                       assert tclassidnode1 isa TClassid
+                                       assert tclassidnode1 isa nullable TClassid
                                        node_list = tclassidnode1
                                        p.push(p.go_to(65), node_list)
        end
 init do end
 end
-private class ReduceAction457
+private class ReduceAction462
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        p.push(p.go_to(66), node_list)
        end
 init do end
 end
-private class ReduceAction458
+private class ReduceAction463
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        p.push(p.go_to(66), node_list)
        end
 init do end
 end
-private class ReduceAction459
+private class ReduceAction464
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
-                                       var pdocnode1 = new ADoc.init_adoc(
+#                                      end
+                                       var pdocnode1: nullable ADoc = new ADoc.init_adoc(
                                                listnode3
                                        )
                                        node_list = pdocnode1
@@ -17771,24 +17929,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction460
+private class ReduceAction465
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode2 = nodearraylist2 
+                                       var listnode2 = nodearraylist2
                                        assert listnode2 isa Array[Object]
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
-                                       var pdocnode1 = new ADoc.init_adoc(
+#                                      end
+                                       var pdocnode1: nullable ADoc = new ADoc.init_adoc(
                                                listnode3
                                        )
                                        node_list = pdocnode1
@@ -17796,56 +17954,56 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction461
+private class ReduceAction466
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        node_list = null
                                        p.push(p.go_to(67), node_list)
        end
 init do end
 end
-private class ReduceAction462
+private class ReduceAction467
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        node_list = null
                                        p.push(p.go_to(68), node_list)
        end
 init do end
 end
-private class ReduceAction463
+private class ReduceAction468
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pdocnode1 = nodearraylist1
-                                       assert pdocnode1 isa PDoc
+                                       assert pdocnode1 isa nullable PDoc
                                        node_list = pdocnode1
                                        p.push(p.go_to(68), node_list)
        end
 init do end
 end
-private class ReduceAction464
+private class ReduceAction469
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        p.push(p.go_to(69), node_list)
        end
 init do end
 end
-private class ReduceAction465
+private class ReduceAction470
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
@@ -17853,35 +18011,35 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction466
+private class ReduceAction471
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        p.push(p.go_to(69), node_list)
        end
 init do end
 end
-private class ReduceAction467
+private class ReduceAction472
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var ppropdefnode1 = nodearraylist1
-                                       assert ppropdefnode1 isa PPropdef
+                                       assert ppropdefnode1 isa nullable PPropdef
                                        node_list = ppropdefnode1
                                        p.push(p.go_to(70), node_list)
        end
 init do end
 end
-private class ReduceAction468
+private class ReduceAction473
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -17890,18 +18048,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist7
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteMethPropdef.init_aconcretemethpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteMethPropdef = new AConcreteMethPropdef.init_aconcretemethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -17915,11 +18073,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction469
+private class ReduceAction474
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -17929,20 +18087,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist8
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteMethPropdef.init_aconcretemethpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteMethPropdef = new AConcreteMethPropdef.init_aconcretemethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -17956,11 +18114,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction470
+private class ReduceAction475
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -17970,18 +18128,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist7
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteMethPropdef.init_aconcretemethpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteMethPropdef = new AConcreteMethPropdef.init_aconcretemethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -17995,11 +18153,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction471
+private class ReduceAction476
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -18010,20 +18168,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var pexprnode8 = nodearraylist8
-                                       assert pexprnode8 isa PExpr
-                                       var ppropdefnode1 = new AConcreteMethPropdef.init_aconcretemethpropdef(
+                                       assert pexprnode8 isa nullable PExpr
+                                       var ppropdefnode1: nullable AConcreteMethPropdef = new AConcreteMethPropdef.init_aconcretemethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -18037,11 +18195,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction472
+private class ReduceAction477
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -18050,16 +18208,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
-                                       var ppropdefnode1 = new AExternMethPropdef.init_aexternmethpropdef(
+                                       assert psignaturenode7 isa nullable PSignature
+                                       var ppropdefnode1: nullable AExternMethPropdef = new AExternMethPropdef.init_aexternmethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -18073,11 +18231,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction473
+private class ReduceAction478
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -18087,18 +18245,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
-                                       var ppropdefnode1 = new AExternMethPropdef.init_aexternmethpropdef(
+                                       assert psignaturenode7 isa nullable PSignature
+                                       var ppropdefnode1: nullable AExternMethPropdef = new AExternMethPropdef.init_aexternmethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -18112,11 +18270,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction474
+private class ReduceAction479
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -18126,18 +18284,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var pvisibilitynode4 = nodearraylist2
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist3
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist4
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist5
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var tstringnode8 = nodearraylist8
-                                       assert tstringnode8 isa TString
-                                       var ppropdefnode1 = new AExternMethPropdef.init_aexternmethpropdef(
+                                       assert tstringnode8 isa nullable TString
+                                       var ppropdefnode1: nullable AExternMethPropdef = new AExternMethPropdef.init_aexternmethpropdef(
                                                pdocnode2,
                                                null,
                                                pvisibilitynode4,
@@ -18151,11 +18309,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction475
+private class ReduceAction480
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
@@ -18166,20 +18324,20 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pdocnode2 = nodearraylist1
-                                       assert pdocnode2 isa PDoc
+                                       assert pdocnode2 isa nullable PDoc
                                        var tkwredefnode3 = nodearraylist2
-                                       assert tkwredefnode3 isa TKwredef
+                                       assert tkwredefnode3 isa nullable TKwredef
                                        var pvisibilitynode4 = nodearraylist3
-                                       assert pvisibilitynode4 isa PVisibility
+                                       assert pvisibilitynode4 isa nullable PVisibility
                                        var tkwmethnode5 = nodearraylist4
-                                       assert tkwmethnode5 isa TKwmeth
+                                       assert tkwmethnode5 isa nullable TKwmeth
                                        var pmethidnode6 = nodearraylist5
-                                       assert pmethidnode6 isa PMethid
+                                       assert pmethidnode6 isa nullable PMethid
                                        var psignaturenode7 = nodearraylist6
-                                       assert psignaturenode7 isa PSignature
+                                       assert psignaturenode7 isa nullable PSignature
                                        var tstringnode8 = nodearraylist9
-                                       assert tstringnode8 isa TString
-                                       var ppropdefnode1 = new AExternMethPropdef.init_aexternmethpropdef(
+                                       assert tstringnode8 isa nullable TString
+                                       var ppropdefnode1: nullable AExternMethPropdef = new AExternMethPropdef.init_aexternmethpropdef(
                                                pdocnode2,
                                                tkwredefnode3,
                                                pvisibilitynode4,
@@ -18193,42 +18351,65 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction476
+private class ReduceAction481
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
-                                       var listnode3 = new Array[Object]
-                                       var tclassidnode2 = nodearraylist1
-                                       assert tclassidnode2 isa TClassid
-                                       var ptypenode1 = new AType.init_atype(
-                                               tclassidnode2,
-                                               listnode3
+                                       var listnode4 = new Array[Object]
+                                       var tclassidnode3 = nodearraylist1
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var ptypenode1: nullable AType = new AType.init_atype(
+                                               null,
+                                               tclassidnode3,
+                                               listnode4
                                        )
                                        node_list = ptypenode1
                                        p.push(p.go_to(72), node_list)
        end
 init do end
 end
-private class ReduceAction477
+private class ReduceAction482
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var listnode4 = new Array[Object]
+                                       var tkwnullablenode2 = nodearraylist1
+                                       assert tkwnullablenode2 isa nullable TKwnullable
+                                       var tclassidnode3 = nodearraylist2
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var ptypenode1: nullable AType = new AType.init_atype(
+                                               tkwnullablenode2,
+                                               tclassidnode3,
+                                               listnode4
+                                       )
+                                       node_list = ptypenode1
+                                       p.push(p.go_to(72), node_list)
+       end
+init do end
+end
+private class ReduceAction483
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(73), node_list)
        end
 init do end
 end
-private class ReduceAction478
+private class ReduceAction484
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -18238,28 +18419,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -18270,39 +18451,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction479
+private class ReduceAction485
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -18313,24 +18494,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction480
+private class ReduceAction486
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(74), node_list)
        end
 init do end
 end
-private class ReduceAction481
+private class ReduceAction487
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -18343,18 +18524,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tkwthennode4 = nodearraylist5
-                                       assert tkwthennode4 isa TKwthen
+                                       assert tkwthennode4 isa nullable TKwthen
                                        var pexprnode5 = nodearraylist7
-                                       assert pexprnode5 isa PExpr
+                                       assert pexprnode5 isa nullable PExpr
                                        var tkwelsenode6 = nodearraylist9
-                                       assert tkwelsenode6 isa TKwelse
+                                       assert tkwelsenode6 isa nullable TKwelse
                                        var pexprnode7 = nodearraylist11
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new AIfexprExpr.init_aifexprexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable AIfexprExpr = new AIfexprExpr.init_aifexprexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                tkwthennode4,
@@ -18367,33 +18548,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction482
+private class ReduceAction488
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(75), node_list)
        end
 init do end
 end
-private class ReduceAction483
+private class ReduceAction489
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOrExpr.init_aorexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOrExpr = new AOrExpr.init_aorexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18402,20 +18583,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction484
+private class ReduceAction490
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AAndExpr.init_aandexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AAndExpr = new AAndExpr.init_aandexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18424,32 +18605,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction485
+private class ReduceAction491
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(76), node_list)
        end
 init do end
 end
-private class ReduceAction486
+private class ReduceAction492
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwnotnode2 = nodearraylist1
-                                       assert tkwnotnode2 isa TKwnot
+                                       assert tkwnotnode2 isa nullable TKwnot
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ANotExpr.init_anotexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ANotExpr = new ANotExpr.init_anotexpr(
                                                tkwnotnode2,
                                                pexprnode3
                                        )
@@ -18458,33 +18639,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction487
+private class ReduceAction493
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(77), node_list)
        end
 init do end
 end
-private class ReduceAction488
+private class ReduceAction494
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AEqExpr.init_aeqexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AEqExpr = new AEqExpr.init_aeqexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18493,20 +18674,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction489
+private class ReduceAction495
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AEeExpr.init_aeeexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AEeExpr = new AEeExpr.init_aeeexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18515,20 +18696,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction490
+private class ReduceAction496
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ANeExpr.init_aneexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ANeExpr = new ANeExpr.init_aneexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18537,20 +18718,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction491
+private class ReduceAction497
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ALtExpr.init_altexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ALtExpr = new ALtExpr.init_altexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18559,20 +18740,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction492
+private class ReduceAction498
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ALeExpr.init_aleexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ALeExpr = new ALeExpr.init_aleexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18581,20 +18762,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction493
+private class ReduceAction499
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AGtExpr.init_agtexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AGtExpr = new AGtExpr.init_agtexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18603,20 +18784,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction494
+private class ReduceAction500
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AGeExpr.init_ageexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AGeExpr = new AGeExpr.init_ageexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18625,20 +18806,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction495
+private class ReduceAction501
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AStarshipExpr.init_astarshipexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AStarshipExpr = new AStarshipExpr.init_astarshipexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18647,20 +18828,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction496
+private class ReduceAction502
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var ptypenode3 = nodearraylist4
-                                       assert ptypenode3 isa PType
-                                       var pexprnode1 = new AIsaExpr.init_aisaexpr(
+                                       assert ptypenode3 isa nullable PType
+                                       var pexprnode1: nullable AIsaExpr = new AIsaExpr.init_aisaexpr(
                                                pexprnode2,
                                                ptypenode3
                                        )
@@ -18669,33 +18850,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction497
+private class ReduceAction503
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(78), node_list)
        end
 init do end
 end
-private class ReduceAction498
+private class ReduceAction504
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new APlusExpr.init_aplusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable APlusExpr = new APlusExpr.init_aplusexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18704,20 +18885,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction499
+private class ReduceAction505
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AMinusExpr.init_aminusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AMinusExpr = new AMinusExpr.init_aminusexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18726,33 +18907,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction500
+private class ReduceAction506
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(79), node_list)
        end
 init do end
 end
-private class ReduceAction501
+private class ReduceAction507
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AStarExpr.init_astarexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AStarExpr = new AStarExpr.init_astarexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18761,20 +18942,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction502
+private class ReduceAction508
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ASlashExpr.init_aslashexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ASlashExpr = new ASlashExpr.init_aslashexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18783,20 +18964,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction503
+private class ReduceAction509
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new APercentExpr.init_apercentexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable APercentExpr = new APercentExpr.init_apercentexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -18805,32 +18986,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction504
+private class ReduceAction510
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(80), node_list)
        end
 init do end
 end
-private class ReduceAction505
+private class ReduceAction511
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tminusnode2 = nodearraylist1
-                                       assert tminusnode2 isa TMinus
+                                       assert tminusnode2 isa nullable TMinus
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AUminusExpr.init_auminusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AUminusExpr = new AUminusExpr.init_auminusexpr(
                                                tminusnode2,
                                                pexprnode3
                                        )
@@ -18839,19 +19020,19 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction506
+private class ReduceAction512
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwoncenode2 = nodearraylist1
-                                       assert tkwoncenode2 isa TKwonce
+                                       assert tkwoncenode2 isa nullable TKwonce
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOnceExpr.init_aonceexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOnceExpr = new AOnceExpr.init_aonceexpr(
                                                tkwoncenode2,
                                                pexprnode3
                                        )
@@ -18860,43 +19041,43 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction507
+private class ReduceAction513
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(81), node_list)
        end
 init do end
 end
-private class ReduceAction508
+private class ReduceAction514
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var tkwnewnode2 = nodearraylist1
-                                       assert tkwnewnode2 isa TKwnew
+                                       assert tkwnewnode2 isa nullable TKwnew
                                        var ptypenode3 = nodearraylist3
-                                       assert ptypenode3 isa PType
-                                       var listnode5 = nodearraylist4 
+                                       assert ptypenode3 isa nullable PType
+                                       var listnode5 = nodearraylist4
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ANewExpr.init_anewexpr(
+#                                      end
+                                       var pexprnode1: nullable ANewExpr = new ANewExpr.init_anewexpr(
                                                tkwnewnode2,
                                                ptypenode3,
                                                null,
@@ -18907,20 +19088,69 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction509
+private class ReduceAction515
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
+                                       var nodearraylist5 = p.pop
+                                       var nodearraylist4 = p.pop
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var tkwissetnode2 = nodearraylist1
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3 = nodearraylist2
+                                       assert pexprnode3 isa nullable PExpr
+                                       var tattridnode4 = nodearraylist5
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
+                                               tkwissetnode2,
+                                               pexprnode3,
+                                               tattridnode4
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(81), node_list)
+       end
+init do end
+end
+private class ReduceAction516
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var tkwissetnode2 = nodearraylist1
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       )
+                                       var tattridnode4 = nodearraylist2
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
+                                               tkwissetnode2,
+                                               pexprnode3,
+                                               tattridnode4
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(81), node_list)
+       end
+init do end
+end
+private class ReduceAction517
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tattridnode3 = nodearraylist4
-                                       assert tattridnode3 isa TAttrid
-                                       var pexprnode1 = new AAttrExpr.init_aattrexpr(
+                                       assert tattridnode3 isa nullable TAttrid
+                                       var pexprnode1: nullable AAttrExpr = new AAttrExpr.init_aattrexpr(
                                                pexprnode2,
                                                tattridnode3
                                        )
@@ -18929,17 +19159,17 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction510
+private class ReduceAction518
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode3 = nodearraylist1
-                                       assert tattridnode3 isa TAttrid
-                                       var pexprnode1 = new AAttrExpr.init_aattrexpr(
+                                       assert tattridnode3 isa nullable TAttrid
+                                       var pexprnode1: nullable AAttrExpr = new AAttrExpr.init_aattrexpr(
                                                pexprnode2,
                                                tattridnode3
                                        )
@@ -18948,11 +19178,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction511
+private class ReduceAction519
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -18961,19 +19191,19 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -18984,29 +19214,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction512
+private class ReduceAction520
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -19017,26 +19247,26 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction513
+private class ReduceAction521
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var tkwsupernode3 = nodearraylist1
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                null,
                                                tkwsupernode3,
                                                listnode5
@@ -19046,29 +19276,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction514
+private class ReduceAction522
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pqualifiednode2 = nodearraylist1
-                                       assert pqualifiednode2 isa PQualified
+                                       assert pqualifiednode2 isa nullable PQualified
                                        var tkwsupernode3 = nodearraylist2
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist3 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist3
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                pqualifiednode2,
                                                tkwsupernode3,
                                                listnode5
@@ -19078,11 +19308,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction515
+private class ReduceAction523
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -19090,19 +19320,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwinitnode3 = nodearraylist4
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist5 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -19112,28 +19342,28 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction516
+private class ReduceAction524
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tkwinitnode3 = nodearraylist1
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -19143,11 +19373,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction517
+private class ReduceAction525
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -19157,21 +19387,21 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var tkwnewnode2 = nodearraylist1
-                                       assert tkwnewnode2 isa TKwnew
+                                       assert tkwnewnode2 isa nullable TKwnew
                                        var ptypenode3 = nodearraylist3
-                                       assert ptypenode3 isa PType
+                                       assert ptypenode3 isa nullable PType
                                        var tidnode4 = nodearraylist6
-                                       assert tidnode4 isa TId
-                                       var listnode5 = nodearraylist7 
+                                       assert tidnode4 isa nullable TId
+                                       var listnode5 = nodearraylist7
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ANewExpr.init_anewexpr(
+#                                      end
+                                       var pexprnode1: nullable ANewExpr = new ANewExpr.init_anewexpr(
                                                tkwnewnode2,
                                                ptypenode3,
                                                tidnode4,
@@ -19182,15 +19412,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction518
+private class ReduceAction526
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwselfnode2 = nodearraylist1
-                                       assert tkwselfnode2 isa TKwself
-                                       var pexprnode1 = new ASelfExpr.init_aselfexpr(
+                                       assert tkwselfnode2 isa nullable TKwself
+                                       var pexprnode1: nullable ASelfExpr = new ASelfExpr.init_aselfexpr(
                                                tkwselfnode2
                                        )
                                        node_list = pexprnode1
@@ -19198,15 +19428,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction519
+private class ReduceAction527
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwtruenode2 = nodearraylist1
-                                       assert tkwtruenode2 isa TKwtrue
-                                       var pexprnode1 = new ATrueExpr.init_atrueexpr(
+                                       assert tkwtruenode2 isa nullable TKwtrue
+                                       var pexprnode1: nullable ATrueExpr = new ATrueExpr.init_atrueexpr(
                                                tkwtruenode2
                                        )
                                        node_list = pexprnode1
@@ -19214,15 +19444,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction520
+private class ReduceAction528
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwfalsenode2 = nodearraylist1
-                                       assert tkwfalsenode2 isa TKwfalse
-                                       var pexprnode1 = new AFalseExpr.init_afalseexpr(
+                                       assert tkwfalsenode2 isa nullable TKwfalse
+                                       var pexprnode1: nullable AFalseExpr = new AFalseExpr.init_afalseexpr(
                                                tkwfalsenode2
                                        )
                                        node_list = pexprnode1
@@ -19230,15 +19460,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction521
+private class ReduceAction529
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwnullnode2 = nodearraylist1
-                                       assert tkwnullnode2 isa TKwnull
-                                       var pexprnode1 = new ANullExpr.init_anullexpr(
+                                       assert tkwnullnode2 isa nullable TKwnull
+                                       var pexprnode1: nullable ANullExpr = new ANullExpr.init_anullexpr(
                                                tkwnullnode2
                                        )
                                        node_list = pexprnode1
@@ -19246,15 +19476,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction522
+private class ReduceAction530
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tnumbernode2 = nodearraylist1
-                                       assert tnumbernode2 isa TNumber
-                                       var pexprnode1 = new AIntExpr.init_aintexpr(
+                                       assert tnumbernode2 isa nullable TNumber
+                                       var pexprnode1: nullable AIntExpr = new AIntExpr.init_aintexpr(
                                                tnumbernode2
                                        )
                                        node_list = pexprnode1
@@ -19262,15 +19492,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction523
+private class ReduceAction531
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tfloatnode2 = nodearraylist1
-                                       assert tfloatnode2 isa TFloat
-                                       var pexprnode1 = new AFloatExpr.init_afloatexpr(
+                                       assert tfloatnode2 isa nullable TFloat
+                                       var pexprnode1: nullable AFloatExpr = new AFloatExpr.init_afloatexpr(
                                                tfloatnode2
                                        )
                                        node_list = pexprnode1
@@ -19278,15 +19508,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction524
+private class ReduceAction532
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tcharnode2 = nodearraylist1
-                                       assert tcharnode2 isa TChar
-                                       var pexprnode1 = new ACharExpr.init_acharexpr(
+                                       assert tcharnode2 isa nullable TChar
+                                       var pexprnode1: nullable ACharExpr = new ACharExpr.init_acharexpr(
                                                tcharnode2
                                        )
                                        node_list = pexprnode1
@@ -19294,15 +19524,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction525
+private class ReduceAction533
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tstringnode2 = nodearraylist1
-                                       assert tstringnode2 isa TString
-                                       var pexprnode1 = new AStringExpr.init_astringexpr(
+                                       assert tstringnode2 isa nullable TString
+                                       var pexprnode1: nullable AStringExpr = new AStringExpr.init_astringexpr(
                                                tstringnode2
                                        )
                                        node_list = pexprnode1
@@ -19310,39 +19540,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction526
+private class ReduceAction534
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(82), node_list)
        end
 init do end
 end
-private class ReduceAction527
+private class ReduceAction535
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist2
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(82), node_list)
        end
 init do end
 end
-private class ReduceAction528
+private class ReduceAction536
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -19354,12 +19584,12 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwasnode3 = nodearraylist4
-                                       assert tkwasnode3 isa TKwas
+                                       assert tkwasnode3 isa nullable TKwas
                                        var ptypenode4 = nodearraylist8
-                                       assert ptypenode4 isa PType
-                                       var pexprnode1 = new AAsCastExpr.init_aascastexpr(
+                                       assert ptypenode4 isa nullable PType
+                                       var pexprnode1: nullable AAsCastExpr = new AAsCastExpr.init_aascastexpr(
                                                pexprnode2,
                                                tkwasnode3,
                                                ptypenode4
@@ -19369,35 +19599,71 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction529
+private class ReduceAction537
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
+                                       var nodearraylist12 = p.pop
+                                       var nodearraylist11 = p.pop
+                                       var nodearraylist10 = p.pop
+                                       var nodearraylist9 = p.pop
+                                       var nodearraylist8 = p.pop
+                                       var nodearraylist7 = p.pop
+                                       var nodearraylist6 = p.pop
+                                       var nodearraylist5 = p.pop
+                                       var nodearraylist4 = p.pop
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var pexprnode2 = nodearraylist1
+                                       assert pexprnode2 isa nullable PExpr
+                                       var tkwasnode3 = nodearraylist4
+                                       assert tkwasnode3 isa nullable TKwas
+                                       var tkwnotnode4 = nodearraylist8
+                                       assert tkwnotnode4 isa nullable TKwnot
+                                       var tkwnullnode5 = nodearraylist10
+                                       assert tkwnullnode5 isa nullable TKwnull
+                                       var pexprnode1: nullable AAsNotnullExpr = new AAsNotnullExpr.init_aasnotnullexpr(
+                                               pexprnode2,
+                                               tkwasnode3,
+                                               tkwnotnode4,
+                                               tkwnullnode5
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(82), node_list)
+       end
+init do end
+end
+private class ReduceAction538
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(83), node_list)
        end
 init do end
 end
-private class ReduceAction530
+private class ReduceAction539
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pexprnode2 = nodearraylist2
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        if pexprnode2 != null then
                                                listnode3.add(pexprnode2)
                                        end
-                                       var pexprnode1 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode1: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode3
                                        )
                                        node_list = pexprnode1
@@ -19405,11 +19671,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction531
+private class ReduceAction540
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -19417,20 +19683,20 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var pexprnode2 = nodearraylist2
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist3 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist3
                                        assert listnode3 isa Array[Object]
                                        if pexprnode2 != null then
                                                listnode4.add(pexprnode2)
                                        end
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var pexprnode1 = new ABlockExpr.init_ablockexpr(
+#                                      end
+                                       var pexprnode1: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode4
                                        )
                                        node_list = pexprnode1
@@ -19438,15 +19704,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction532
+private class ReduceAction541
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
-                                       var pexprnode1 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode1: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode2
                                        )
                                        node_list = pexprnode1
@@ -19454,14 +19720,14 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction533
+private class ReduceAction542
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
-                                       var pexprnode1 = new ABlockExpr.init_ablockexpr(
+                                       var pexprnode1: nullable ABlockExpr = new ABlockExpr.init_ablockexpr(
                                                listnode2
                                        )
                                        node_list = pexprnode1
@@ -19469,41 +19735,41 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction534
+private class ReduceAction543
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(84), node_list)
        end
 init do end
 end
-private class ReduceAction535
+private class ReduceAction544
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(84), node_list)
        end
 init do end
 end
-private class ReduceAction536
+private class ReduceAction545
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwreturnnode2 = nodearraylist1
-                                       assert tkwreturnnode2 isa TKwreturn
-                                       var pexprnode1 = new AReturnExpr.init_areturnexpr(
+                                       assert tkwreturnnode2 isa nullable TKwreturn
+                                       var pexprnode1: nullable AReturnExpr = new AReturnExpr.init_areturnexpr(
                                                tkwreturnnode2,
                                                null
                                        )
@@ -19512,18 +19778,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction537
+private class ReduceAction546
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwreturnnode2 = nodearraylist1
-                                       assert tkwreturnnode2 isa TKwreturn
+                                       assert tkwreturnnode2 isa nullable TKwreturn
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AReturnExpr.init_areturnexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AReturnExpr = new AReturnExpr.init_areturnexpr(
                                                tkwreturnnode2,
                                                pexprnode3
                                        )
@@ -19532,15 +19798,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction538
+private class ReduceAction547
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwbreaknode2 = nodearraylist1
-                                       assert tkwbreaknode2 isa TKwbreak
-                                       var pexprnode1 = new ABreakExpr.init_abreakexpr(
+                                       assert tkwbreaknode2 isa nullable TKwbreak
+                                       var pexprnode1: nullable ABreakExpr = new ABreakExpr.init_abreakexpr(
                                                tkwbreaknode2,
                                                null
                                        )
@@ -19549,18 +19815,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction539
+private class ReduceAction548
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwbreaknode2 = nodearraylist1
-                                       assert tkwbreaknode2 isa TKwbreak
+                                       assert tkwbreaknode2 isa nullable TKwbreak
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ABreakExpr.init_abreakexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ABreakExpr = new ABreakExpr.init_abreakexpr(
                                                tkwbreaknode2,
                                                pexprnode3
                                        )
@@ -19569,15 +19835,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction540
+private class ReduceAction549
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwabortnode2 = nodearraylist1
-                                       assert tkwabortnode2 isa TKwabort
-                                       var pexprnode1 = new AAbortExpr.init_aabortexpr(
+                                       assert tkwabortnode2 isa nullable TKwabort
+                                       var pexprnode1: nullable AAbortExpr = new AAbortExpr.init_aabortexpr(
                                                tkwabortnode2
                                        )
                                        node_list = pexprnode1
@@ -19585,15 +19851,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction541
+private class ReduceAction550
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwcontinuenode2 = nodearraylist1
-                                       assert tkwcontinuenode2 isa TKwcontinue
-                                       var pexprnode1 = new AContinueExpr.init_acontinueexpr(
+                                       assert tkwcontinuenode2 isa nullable TKwcontinue
+                                       var pexprnode1: nullable AContinueExpr = new AContinueExpr.init_acontinueexpr(
                                                tkwcontinuenode2,
                                                null
                                        )
@@ -19602,18 +19868,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction542
+private class ReduceAction551
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwcontinuenode2 = nodearraylist1
-                                       assert tkwcontinuenode2 isa TKwcontinue
+                                       assert tkwcontinuenode2 isa nullable TKwcontinue
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AContinueExpr.init_acontinueexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AContinueExpr = new AContinueExpr.init_acontinueexpr(
                                                tkwcontinuenode2,
                                                pexprnode3
                                        )
@@ -19622,76 +19888,76 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction543
+private class ReduceAction552
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(84), node_list)
        end
 init do end
 end
-private class ReduceAction544
+private class ReduceAction553
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(84), node_list)
        end
 init do end
 end
-private class ReduceAction545
+private class ReduceAction554
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(84), node_list)
        end
 init do end
 end
-private class ReduceAction546
+private class ReduceAction555
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(84), node_list)
        end
 init do end
 end
-private class ReduceAction547
+private class ReduceAction556
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(84), node_list)
        end
 init do end
 end
-private class ReduceAction548
+private class ReduceAction557
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -19700,19 +19966,19 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -19723,29 +19989,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction549
+private class ReduceAction558
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -19756,11 +20022,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction550
+private class ReduceAction559
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -19770,28 +20036,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -19802,39 +20068,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction551
+private class ReduceAction560
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -19845,26 +20111,26 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction552
+private class ReduceAction561
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var tkwsupernode3 = nodearraylist1
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                null,
                                                tkwsupernode3,
                                                listnode5
@@ -19874,29 +20140,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction553
+private class ReduceAction562
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pqualifiednode2 = nodearraylist1
-                                       assert pqualifiednode2 isa PQualified
+                                       assert pqualifiednode2 isa nullable PQualified
                                        var tkwsupernode3 = nodearraylist2
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist3 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist3
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                pqualifiednode2,
                                                tkwsupernode3,
                                                listnode5
@@ -19906,11 +20172,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction554
+private class ReduceAction563
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -19918,19 +20184,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwinitnode3 = nodearraylist4
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist5 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -19940,28 +20206,28 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction555
+private class ReduceAction564
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tkwinitnode3 = nodearraylist1
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -19971,15 +20237,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction556
+private class ReduceAction565
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pclosuredefnode1 = nodearraylist1
-                                       assert pclosuredefnode1 isa PClosureDef
+                                       assert pclosuredefnode1 isa nullable PClosureDef
                                        if pclosuredefnode1 != null then
                                                listnode2.add(pclosuredefnode1)
                                        end
@@ -19988,49 +20254,49 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction557
+private class ReduceAction566
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var pclosuredefnode1 = nodearraylist1
-                                       assert pclosuredefnode1 isa PClosureDef
-                                       var listnode2 = nodearraylist2 
+                                       assert pclosuredefnode1 isa nullable PClosureDef
+                                       var listnode2 = nodearraylist2
                                        assert listnode2 isa Array[Object]
                                        if pclosuredefnode1 != null then
                                                listnode3.add(pclosuredefnode1)
                                        end
-                                       if listnode2 != null then
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(85), node_list)
        end
 init do end
 end
-private class ReduceAction558
+private class ReduceAction567
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
+                                       assert tkwwithnode2 isa nullable TKwwith
                                        var tkwdonode4 = nodearraylist2
-                                       assert tkwdonode4 isa TKwdo
+                                       assert tkwdonode4 isa nullable TKwdo
                                        var pexprnode5 = nodearraylist3
-                                       assert pexprnode5 isa PExpr
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode3,
                                                tkwdonode4,
@@ -20041,32 +20307,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction559
+private class ReduceAction568
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var tkwwithnode2 = nodearraylist1
-                                       assert tkwwithnode2 isa TKwwith
-                                       var listnode3 = nodearraylist2 
+                                       assert tkwwithnode2 isa nullable TKwwith
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var tkwdonode5 = nodearraylist3
-                                       assert tkwdonode5 isa TKwdo
+                                       assert tkwdonode5 isa nullable TKwdo
                                        var pexprnode6 = nodearraylist4
-                                       assert pexprnode6 isa PExpr
-                                       var pclosuredefnode1 = new AClosureDef.init_aclosuredef(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pclosuredefnode1: nullable AClosureDef = new AClosureDef.init_aclosuredef(
                                                tkwwithnode2,
                                                listnode4,
                                                tkwdonode5,
@@ -20077,18 +20343,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction560
+private class ReduceAction569
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwvarnode2 = nodearraylist1
-                                       assert tkwvarnode2 isa TKwvar
+                                       assert tkwvarnode2 isa nullable TKwvar
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
-                                       var pexprnode1 = new AVardeclExpr.init_avardeclexpr(
+                                       assert tidnode3 isa nullable TId
+                                       var pexprnode1: nullable AVardeclExpr = new AVardeclExpr.init_avardeclexpr(
                                                tkwvarnode2,
                                                tidnode3,
                                                null,
@@ -20100,21 +20366,21 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction561
+private class ReduceAction570
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwvarnode2 = nodearraylist1
-                                       assert tkwvarnode2 isa TKwvar
+                                       assert tkwvarnode2 isa nullable TKwvar
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var ptypenode4 = nodearraylist3
-                                       assert ptypenode4 isa PType
-                                       var pexprnode1 = new AVardeclExpr.init_avardeclexpr(
+                                       assert ptypenode4 isa nullable PType
+                                       var pexprnode1: nullable AVardeclExpr = new AVardeclExpr.init_avardeclexpr(
                                                tkwvarnode2,
                                                tidnode3,
                                                ptypenode4,
@@ -20126,25 +20392,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction562
+private class ReduceAction571
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwvarnode2 = nodearraylist1
-                                       assert tkwvarnode2 isa TKwvar
+                                       assert tkwvarnode2 isa nullable TKwvar
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var tassignnode5 = nodearraylist3
-                                       assert tassignnode5 isa TAssign
+                                       assert tassignnode5 isa nullable TAssign
                                        var pexprnode6 = nodearraylist5
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new AVardeclExpr.init_avardeclexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable AVardeclExpr = new AVardeclExpr.init_avardeclexpr(
                                                tkwvarnode2,
                                                tidnode3,
                                                null,
@@ -20156,11 +20422,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction563
+private class ReduceAction572
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -20168,16 +20434,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwvarnode2 = nodearraylist1
-                                       assert tkwvarnode2 isa TKwvar
+                                       assert tkwvarnode2 isa nullable TKwvar
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var ptypenode4 = nodearraylist3
-                                       assert ptypenode4 isa PType
+                                       assert ptypenode4 isa nullable PType
                                        var tassignnode5 = nodearraylist4
-                                       assert tassignnode5 isa TAssign
+                                       assert tassignnode5 isa nullable TAssign
                                        var pexprnode6 = nodearraylist6
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new AVardeclExpr.init_avardeclexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable AVardeclExpr = new AVardeclExpr.init_avardeclexpr(
                                                tkwvarnode2,
                                                tidnode3,
                                                ptypenode4,
@@ -20189,11 +20455,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction564
+private class ReduceAction573
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -20201,14 +20467,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tattridnode3 = nodearraylist4
-                                       assert tattridnode3 isa TAttrid
+                                       assert tattridnode3 isa nullable TAttrid
                                        var tassignnode4 = nodearraylist5
-                                       assert tassignnode4 isa TAssign
+                                       assert tassignnode4 isa nullable TAssign
                                        var pexprnode5 = nodearraylist6
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AAttrAssignExpr.init_aattrassignexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AAttrAssignExpr = new AAttrAssignExpr.init_aattrassignexpr(
                                                pexprnode2,
                                                tattridnode3,
                                                tassignnode4,
@@ -20219,23 +20485,23 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction565
+private class ReduceAction574
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode3 = nodearraylist1
-                                       assert tattridnode3 isa TAttrid
+                                       assert tattridnode3 isa nullable TAttrid
                                        var tassignnode4 = nodearraylist2
-                                       assert tassignnode4 isa TAssign
+                                       assert tassignnode4 isa nullable TAssign
                                        var pexprnode5 = nodearraylist3
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AAttrAssignExpr.init_aattrassignexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AAttrAssignExpr = new AAttrAssignExpr.init_aattrassignexpr(
                                                pexprnode2,
                                                tattridnode3,
                                                tassignnode4,
@@ -20246,11 +20512,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction566
+private class ReduceAction575
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -20260,23 +20526,23 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        var tassignnode6 = nodearraylist6
-                                       assert tassignnode6 isa TAssign
+                                       assert tassignnode6 isa nullable TAssign
                                        var pexprnode7 = nodearraylist7
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new ACallAssignExpr.init_acallassignexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable ACallAssignExpr = new ACallAssignExpr.init_acallassignexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -20288,34 +20554,34 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction567
+private class ReduceAction576
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        var tassignnode6 = nodearraylist3
-                                       assert tassignnode6 isa TAssign
+                                       assert tassignnode6 isa nullable TAssign
                                        var pexprnode7 = nodearraylist4
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new ACallAssignExpr.init_acallassignexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable ACallAssignExpr = new ACallAssignExpr.init_acallassignexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -20327,32 +20593,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction568
+private class ReduceAction577
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist2 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var tassignnode5 = nodearraylist3
-                                       assert tassignnode5 isa TAssign
+                                       assert tassignnode5 isa nullable TAssign
                                        var pexprnode6 = nodearraylist4
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new ABraAssignExpr.init_abraassignexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable ABraAssignExpr = new ABraAssignExpr.init_abraassignexpr(
                                                pexprnode2,
                                                listnode4,
                                                tassignnode5,
@@ -20363,11 +20629,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction569
+private class ReduceAction578
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -20375,14 +20641,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tattridnode3 = nodearraylist4
-                                       assert tattridnode3 isa TAttrid
+                                       assert tattridnode3 isa nullable TAttrid
                                        var passignopnode4 = nodearraylist5
-                                       assert passignopnode4 isa PAssignOp
+                                       assert passignopnode4 isa nullable PAssignOp
                                        var pexprnode5 = nodearraylist6
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AAttrReassignExpr.init_aattrreassignexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AAttrReassignExpr = new AAttrReassignExpr.init_aattrreassignexpr(
                                                pexprnode2,
                                                tattridnode3,
                                                passignopnode4,
@@ -20393,23 +20659,23 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction570
+private class ReduceAction579
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode3 = nodearraylist1
-                                       assert tattridnode3 isa TAttrid
+                                       assert tattridnode3 isa nullable TAttrid
                                        var passignopnode4 = nodearraylist2
-                                       assert passignopnode4 isa PAssignOp
+                                       assert passignopnode4 isa nullable PAssignOp
                                        var pexprnode5 = nodearraylist3
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AAttrReassignExpr.init_aattrreassignexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AAttrReassignExpr = new AAttrReassignExpr.init_aattrreassignexpr(
                                                pexprnode2,
                                                tattridnode3,
                                                passignopnode4,
@@ -20420,11 +20686,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction571
+private class ReduceAction580
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -20434,23 +20700,23 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        var passignopnode6 = nodearraylist6
-                                       assert passignopnode6 isa PAssignOp
+                                       assert passignopnode6 isa nullable PAssignOp
                                        var pexprnode7 = nodearraylist7
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new ACallReassignExpr.init_acallreassignexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable ACallReassignExpr = new ACallReassignExpr.init_acallreassignexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -20462,34 +20728,34 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction572
+private class ReduceAction581
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
+#                                      end
                                        var passignopnode6 = nodearraylist3
-                                       assert passignopnode6 isa PAssignOp
+                                       assert passignopnode6 isa nullable PAssignOp
                                        var pexprnode7 = nodearraylist4
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new ACallReassignExpr.init_acallreassignexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable ACallReassignExpr = new ACallReassignExpr.init_acallreassignexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -20501,32 +20767,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction573
+private class ReduceAction582
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist2 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
+#                                      end
                                        var passignopnode5 = nodearraylist3
-                                       assert passignopnode5 isa PAssignOp
+                                       assert passignopnode5 isa nullable PAssignOp
                                        var pexprnode6 = nodearraylist4
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new ABraReassignExpr.init_abrareassignexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable ABraReassignExpr = new ABraReassignExpr.init_abrareassignexpr(
                                                pexprnode2,
                                                listnode4,
                                                passignopnode5,
@@ -20537,18 +20803,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction574
+private class ReduceAction583
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwdonode2 = nodearraylist1
-                                       assert tkwdonode2 isa TKwdo
+                                       assert tkwdonode2 isa nullable TKwdo
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ADoExpr.init_adoexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ADoExpr = new ADoExpr.init_adoexpr(
                                                tkwdonode2,
                                                pexprnode3
                                        )
@@ -20557,11 +20823,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction575
+private class ReduceAction584
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist8 = p.pop
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
@@ -20571,14 +20837,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var pexprnode4 = nodearraylist6
-                                       assert pexprnode4 isa PExpr
+                                       assert pexprnode4 isa nullable PExpr
                                        var pexprnode5 = nodearraylist8
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AIfExpr.init_aifexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AIfExpr = new AIfExpr.init_aifexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                pexprnode4,
@@ -20589,11 +20855,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction576
+private class ReduceAction585
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -20601,14 +20867,14 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwwhilenode2 = nodearraylist1
-                                       assert tkwwhilenode2 isa TKwwhile
+                                       assert tkwwhilenode2 isa nullable TKwwhile
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tkwdonode4 = nodearraylist5
-                                       assert tkwdonode4 isa TKwdo
+                                       assert tkwdonode4 isa nullable TKwdo
                                        var pexprnode5 = nodearraylist6
-                                       assert pexprnode5 isa PExpr
-                                       var pexprnode1 = new AWhileExpr.init_awhileexpr(
+                                       assert pexprnode5 isa nullable PExpr
+                                       var pexprnode1: nullable AWhileExpr = new AWhileExpr.init_awhileexpr(
                                                tkwwhilenode2,
                                                pexprnode3,
                                                tkwdonode4,
@@ -20619,11 +20885,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction577
+private class ReduceAction586
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -20635,16 +20901,16 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwfornode2 = nodearraylist1
-                                       assert tkwfornode2 isa TKwfor
+                                       assert tkwfornode2 isa nullable TKwfor
                                        var tidnode3 = nodearraylist3
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var pexprnode4 = nodearraylist7
-                                       assert pexprnode4 isa PExpr
+                                       assert pexprnode4 isa nullable PExpr
                                        var tkwdonode5 = nodearraylist9
-                                       assert tkwdonode5 isa TKwdo
+                                       assert tkwdonode5 isa nullable TKwdo
                                        var pexprnode6 = nodearraylist10
-                                       assert pexprnode6 isa PExpr
-                                       var pexprnode1 = new AForExpr.init_aforexpr(
+                                       assert pexprnode6 isa nullable PExpr
+                                       var pexprnode1: nullable AForExpr = new AForExpr.init_aforexpr(
                                                tkwfornode2,
                                                tidnode3,
                                                pexprnode4,
@@ -20656,18 +20922,18 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction578
+private class ReduceAction587
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwassertnode2 = nodearraylist1
-                                       assert tkwassertnode2 isa TKwassert
+                                       assert tkwassertnode2 isa nullable TKwassert
                                        var pexprnode4 = nodearraylist2
-                                       assert pexprnode4 isa PExpr
-                                       var pexprnode1 = new AAssertExpr.init_aassertexpr(
+                                       assert pexprnode4 isa nullable PExpr
+                                       var pexprnode1: nullable AAssertExpr = new AAssertExpr.init_aassertexpr(
                                                tkwassertnode2,
                                                null,
                                                pexprnode4
@@ -20677,21 +20943,21 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction579
+private class ReduceAction588
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwassertnode2 = nodearraylist1
-                                       assert tkwassertnode2 isa TKwassert
+                                       assert tkwassertnode2 isa nullable TKwassert
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
+                                       assert tidnode3 isa nullable TId
                                        var pexprnode4 = nodearraylist3
-                                       assert pexprnode4 isa PExpr
-                                       var pexprnode1 = new AAssertExpr.init_aassertexpr(
+                                       assert pexprnode4 isa nullable PExpr
+                                       var pexprnode1: nullable AAssertExpr = new AAssertExpr.init_aassertexpr(
                                                tkwassertnode2,
                                                tidnode3,
                                                pexprnode4
@@ -20701,24 +20967,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction580
+private class ReduceAction589
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(94), node_list)
        end
 init do end
 end
-private class ReduceAction581
+private class ReduceAction590
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -20728,28 +20994,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -20760,39 +21026,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction582
+private class ReduceAction591
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -20803,37 +21069,37 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction583
+private class ReduceAction592
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode4 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
-                                       var listnode3 = nodearraylist2 
+                                       assert pexprnode2 isa nullable PExpr
+                                       var listnode3 = nodearraylist2
                                        assert listnode3 isa Array[Object]
-                                       if listnode3 != null then
+#                                      if listnode3 != null then
                                                if listnode4.is_empty then
                                                        listnode4 = listnode3
                                                else
                                                        listnode4.append(listnode3)
                                                end
-                                       end
-                                       var listnode5 = nodearraylist3 
+#                                      end
+                                       var listnode5 = nodearraylist3
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ABraExpr.init_abraexpr(
+#                                      end
+                                       var pexprnode1: nullable ABraExpr = new ABraExpr.init_abraexpr(
                                                pexprnode2,
                                                listnode4,
                                                listnode6
@@ -20843,24 +21109,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction584
+private class ReduceAction593
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(95), node_list)
        end
 init do end
 end
-private class ReduceAction585
+private class ReduceAction594
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -20870,28 +21136,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -20902,39 +21168,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction586
+private class ReduceAction595
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -20945,24 +21211,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction587
+private class ReduceAction596
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(96), node_list)
        end
 init do end
 end
-private class ReduceAction588
+private class ReduceAction597
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -20972,28 +21238,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -21004,39 +21270,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction589
+private class ReduceAction598
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -21047,24 +21313,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction590
+private class ReduceAction599
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(97), node_list)
        end
 init do end
 end
-private class ReduceAction591
+private class ReduceAction600
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -21077,18 +21343,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tkwthennode4 = nodearraylist5
-                                       assert tkwthennode4 isa TKwthen
+                                       assert tkwthennode4 isa nullable TKwthen
                                        var pexprnode5 = nodearraylist7
-                                       assert pexprnode5 isa PExpr
+                                       assert pexprnode5 isa nullable PExpr
                                        var tkwelsenode6 = nodearraylist9
-                                       assert tkwelsenode6 isa TKwelse
+                                       assert tkwelsenode6 isa nullable TKwelse
                                        var pexprnode7 = nodearraylist11
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new AIfexprExpr.init_aifexprexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable AIfexprExpr = new AIfexprExpr.init_aifexprexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                tkwthennode4,
@@ -21101,33 +21367,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction592
+private class ReduceAction601
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(98), node_list)
        end
 init do end
 end
-private class ReduceAction593
+private class ReduceAction602
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOrExpr.init_aorexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOrExpr = new AOrExpr.init_aorexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21136,20 +21402,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction594
+private class ReduceAction603
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AAndExpr.init_aandexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AAndExpr = new AAndExpr.init_aandexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21158,32 +21424,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction595
+private class ReduceAction604
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(99), node_list)
        end
 init do end
 end
-private class ReduceAction596
+private class ReduceAction605
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwnotnode2 = nodearraylist1
-                                       assert tkwnotnode2 isa TKwnot
+                                       assert tkwnotnode2 isa nullable TKwnot
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ANotExpr.init_anotexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ANotExpr = new ANotExpr.init_anotexpr(
                                                tkwnotnode2,
                                                pexprnode3
                                        )
@@ -21192,33 +21458,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction597
+private class ReduceAction606
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(100), node_list)
        end
 init do end
 end
-private class ReduceAction598
+private class ReduceAction607
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AEqExpr.init_aeqexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AEqExpr = new AEqExpr.init_aeqexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21227,20 +21493,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction599
+private class ReduceAction608
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AEeExpr.init_aeeexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AEeExpr = new AEeExpr.init_aeeexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21249,20 +21515,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction600
+private class ReduceAction609
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ANeExpr.init_aneexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ANeExpr = new ANeExpr.init_aneexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21271,20 +21537,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction601
+private class ReduceAction610
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ALtExpr.init_altexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ALtExpr = new ALtExpr.init_altexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21293,20 +21559,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction602
+private class ReduceAction611
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ALeExpr.init_aleexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ALeExpr = new ALeExpr.init_aleexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21315,20 +21581,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction603
+private class ReduceAction612
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AGtExpr.init_agtexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AGtExpr = new AGtExpr.init_agtexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21337,20 +21603,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction604
+private class ReduceAction613
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AGeExpr.init_ageexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AGeExpr = new AGeExpr.init_ageexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21359,20 +21625,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction605
+private class ReduceAction614
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AStarshipExpr.init_astarshipexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AStarshipExpr = new AStarshipExpr.init_astarshipexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21381,20 +21647,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction606
+private class ReduceAction615
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var ptypenode3 = nodearraylist4
-                                       assert ptypenode3 isa PType
-                                       var pexprnode1 = new AIsaExpr.init_aisaexpr(
+                                       assert ptypenode3 isa nullable PType
+                                       var pexprnode1: nullable AIsaExpr = new AIsaExpr.init_aisaexpr(
                                                pexprnode2,
                                                ptypenode3
                                        )
@@ -21403,33 +21669,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction607
+private class ReduceAction616
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(101), node_list)
        end
 init do end
 end
-private class ReduceAction608
+private class ReduceAction617
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new APlusExpr.init_aplusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable APlusExpr = new APlusExpr.init_aplusexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21438,20 +21704,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction609
+private class ReduceAction618
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AMinusExpr.init_aminusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AMinusExpr = new AMinusExpr.init_aminusexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21460,33 +21726,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction610
+private class ReduceAction619
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(102), node_list)
        end
 init do end
 end
-private class ReduceAction611
+private class ReduceAction620
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AStarExpr.init_astarexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AStarExpr = new AStarExpr.init_astarexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21495,20 +21761,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction612
+private class ReduceAction621
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ASlashExpr.init_aslashexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ASlashExpr = new ASlashExpr.init_aslashexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21517,20 +21783,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction613
+private class ReduceAction622
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new APercentExpr.init_apercentexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable APercentExpr = new APercentExpr.init_apercentexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -21539,32 +21805,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction614
+private class ReduceAction623
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(103), node_list)
        end
 init do end
 end
-private class ReduceAction615
+private class ReduceAction624
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tminusnode2 = nodearraylist1
-                                       assert tminusnode2 isa TMinus
+                                       assert tminusnode2 isa nullable TMinus
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AUminusExpr.init_auminusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AUminusExpr = new AUminusExpr.init_auminusexpr(
                                                tminusnode2,
                                                pexprnode3
                                        )
@@ -21573,19 +21839,19 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction616
+private class ReduceAction625
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwoncenode2 = nodearraylist1
-                                       assert tkwoncenode2 isa TKwonce
+                                       assert tkwoncenode2 isa nullable TKwonce
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOnceExpr.init_aonceexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOnceExpr = new AOnceExpr.init_aonceexpr(
                                                tkwoncenode2,
                                                pexprnode3
                                        )
@@ -21594,43 +21860,43 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction617
+private class ReduceAction626
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(104), node_list)
        end
 init do end
 end
-private class ReduceAction618
+private class ReduceAction627
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var tkwnewnode2 = nodearraylist1
-                                       assert tkwnewnode2 isa TKwnew
+                                       assert tkwnewnode2 isa nullable TKwnew
                                        var ptypenode3 = nodearraylist3
-                                       assert ptypenode3 isa PType
-                                       var listnode5 = nodearraylist4 
+                                       assert ptypenode3 isa nullable PType
+                                       var listnode5 = nodearraylist4
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ANewExpr.init_anewexpr(
+#                                      end
+                                       var pexprnode1: nullable ANewExpr = new ANewExpr.init_anewexpr(
                                                tkwnewnode2,
                                                ptypenode3,
                                                null,
@@ -21641,20 +21907,69 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction619
+private class ReduceAction628
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist5 = p.pop
+                                       var nodearraylist4 = p.pop
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var tkwissetnode2 = nodearraylist1
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3 = nodearraylist2
+                                       assert pexprnode3 isa nullable PExpr
+                                       var tattridnode4 = nodearraylist5
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
+                                               tkwissetnode2,
+                                               pexprnode3,
+                                               tattridnode4
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(104), node_list)
+       end
+init do end
+end
+private class ReduceAction629
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var tkwissetnode2 = nodearraylist1
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       )
+                                       var tattridnode4 = nodearraylist2
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
+                                               tkwissetnode2,
+                                               pexprnode3,
+                                               tattridnode4
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(104), node_list)
+       end
+init do end
+end
+private class ReduceAction630
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tattridnode3 = nodearraylist4
-                                       assert tattridnode3 isa TAttrid
-                                       var pexprnode1 = new AAttrExpr.init_aattrexpr(
+                                       assert tattridnode3 isa nullable TAttrid
+                                       var pexprnode1: nullable AAttrExpr = new AAttrExpr.init_aattrexpr(
                                                pexprnode2,
                                                tattridnode3
                                        )
@@ -21663,17 +21978,17 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction620
+private class ReduceAction631
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode3 = nodearraylist1
-                                       assert tattridnode3 isa TAttrid
-                                       var pexprnode1 = new AAttrExpr.init_aattrexpr(
+                                       assert tattridnode3 isa nullable TAttrid
+                                       var pexprnode1: nullable AAttrExpr = new AAttrExpr.init_aattrexpr(
                                                pexprnode2,
                                                tattridnode3
                                        )
@@ -21682,11 +21997,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction621
+private class ReduceAction632
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -21695,19 +22010,19 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -21718,29 +22033,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction622
+private class ReduceAction633
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -21751,26 +22066,26 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction623
+private class ReduceAction634
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var tkwsupernode3 = nodearraylist1
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                null,
                                                tkwsupernode3,
                                                listnode5
@@ -21780,29 +22095,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction624
+private class ReduceAction635
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pqualifiednode2 = nodearraylist1
-                                       assert pqualifiednode2 isa PQualified
+                                       assert pqualifiednode2 isa nullable PQualified
                                        var tkwsupernode3 = nodearraylist2
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist3 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist3
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                pqualifiednode2,
                                                tkwsupernode3,
                                                listnode5
@@ -21812,11 +22127,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction625
+private class ReduceAction636
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
@@ -21824,19 +22139,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwinitnode3 = nodearraylist4
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist5 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -21846,28 +22161,28 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction626
+private class ReduceAction637
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tkwinitnode3 = nodearraylist1
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -21877,11 +22192,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction627
+private class ReduceAction638
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -21891,21 +22206,21 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var tkwnewnode2 = nodearraylist1
-                                       assert tkwnewnode2 isa TKwnew
+                                       assert tkwnewnode2 isa nullable TKwnew
                                        var ptypenode3 = nodearraylist3
-                                       assert ptypenode3 isa PType
+                                       assert ptypenode3 isa nullable PType
                                        var tidnode4 = nodearraylist6
-                                       assert tidnode4 isa TId
-                                       var listnode5 = nodearraylist7 
+                                       assert tidnode4 isa nullable TId
+                                       var listnode5 = nodearraylist7
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ANewExpr.init_anewexpr(
+#                                      end
+                                       var pexprnode1: nullable ANewExpr = new ANewExpr.init_anewexpr(
                                                tkwnewnode2,
                                                ptypenode3,
                                                tidnode4,
@@ -21916,15 +22231,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction628
+private class ReduceAction639
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwselfnode2 = nodearraylist1
-                                       assert tkwselfnode2 isa TKwself
-                                       var pexprnode1 = new ASelfExpr.init_aselfexpr(
+                                       assert tkwselfnode2 isa nullable TKwself
+                                       var pexprnode1: nullable ASelfExpr = new ASelfExpr.init_aselfexpr(
                                                tkwselfnode2
                                        )
                                        node_list = pexprnode1
@@ -21932,15 +22247,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction629
+private class ReduceAction640
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwtruenode2 = nodearraylist1
-                                       assert tkwtruenode2 isa TKwtrue
-                                       var pexprnode1 = new ATrueExpr.init_atrueexpr(
+                                       assert tkwtruenode2 isa nullable TKwtrue
+                                       var pexprnode1: nullable ATrueExpr = new ATrueExpr.init_atrueexpr(
                                                tkwtruenode2
                                        )
                                        node_list = pexprnode1
@@ -21948,15 +22263,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction630
+private class ReduceAction641
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwfalsenode2 = nodearraylist1
-                                       assert tkwfalsenode2 isa TKwfalse
-                                       var pexprnode1 = new AFalseExpr.init_afalseexpr(
+                                       assert tkwfalsenode2 isa nullable TKwfalse
+                                       var pexprnode1: nullable AFalseExpr = new AFalseExpr.init_afalseexpr(
                                                tkwfalsenode2
                                        )
                                        node_list = pexprnode1
@@ -21964,15 +22279,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction631
+private class ReduceAction642
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwnullnode2 = nodearraylist1
-                                       assert tkwnullnode2 isa TKwnull
-                                       var pexprnode1 = new ANullExpr.init_anullexpr(
+                                       assert tkwnullnode2 isa nullable TKwnull
+                                       var pexprnode1: nullable ANullExpr = new ANullExpr.init_anullexpr(
                                                tkwnullnode2
                                        )
                                        node_list = pexprnode1
@@ -21980,15 +22295,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction632
+private class ReduceAction643
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tnumbernode2 = nodearraylist1
-                                       assert tnumbernode2 isa TNumber
-                                       var pexprnode1 = new AIntExpr.init_aintexpr(
+                                       assert tnumbernode2 isa nullable TNumber
+                                       var pexprnode1: nullable AIntExpr = new AIntExpr.init_aintexpr(
                                                tnumbernode2
                                        )
                                        node_list = pexprnode1
@@ -21996,15 +22311,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction633
+private class ReduceAction644
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tfloatnode2 = nodearraylist1
-                                       assert tfloatnode2 isa TFloat
-                                       var pexprnode1 = new AFloatExpr.init_afloatexpr(
+                                       assert tfloatnode2 isa nullable TFloat
+                                       var pexprnode1: nullable AFloatExpr = new AFloatExpr.init_afloatexpr(
                                                tfloatnode2
                                        )
                                        node_list = pexprnode1
@@ -22012,15 +22327,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction634
+private class ReduceAction645
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tcharnode2 = nodearraylist1
-                                       assert tcharnode2 isa TChar
-                                       var pexprnode1 = new ACharExpr.init_acharexpr(
+                                       assert tcharnode2 isa nullable TChar
+                                       var pexprnode1: nullable ACharExpr = new ACharExpr.init_acharexpr(
                                                tcharnode2
                                        )
                                        node_list = pexprnode1
@@ -22028,15 +22343,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction635
+private class ReduceAction646
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tstringnode2 = nodearraylist1
-                                       assert tstringnode2 isa TString
-                                       var pexprnode1 = new AStringExpr.init_astringexpr(
+                                       assert tstringnode2 isa nullable TString
+                                       var pexprnode1: nullable AStringExpr = new AStringExpr.init_astringexpr(
                                                tstringnode2
                                        )
                                        node_list = pexprnode1
@@ -22044,24 +22359,57 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction636
+private class ReduceAction647
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist1 = p.pop
+                                       var pexprnode1 = nodearraylist1
+                                       assert pexprnode1 isa nullable PExpr
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(105), node_list)
+       end
+init do end
+end
+private class ReduceAction648
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
+                                       var nodearraylist10 = p.pop
+                                       var nodearraylist9 = p.pop
+                                       var nodearraylist8 = p.pop
+                                       var nodearraylist7 = p.pop
+                                       var nodearraylist6 = p.pop
+                                       var nodearraylist5 = p.pop
+                                       var nodearraylist4 = p.pop
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
-                                       var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       var pexprnode2 = nodearraylist1
+                                       assert pexprnode2 isa nullable PExpr
+                                       var tkwasnode3 = nodearraylist4
+                                       assert tkwasnode3 isa nullable TKwas
+                                       var ptypenode4 = nodearraylist8
+                                       assert ptypenode4 isa nullable PType
+                                       var pexprnode1: nullable AAsCastExpr = new AAsCastExpr.init_aascastexpr(
+                                               pexprnode2,
+                                               tkwasnode3,
+                                               ptypenode4
+                                       )
                                        node_list = pexprnode1
                                        p.push(p.go_to(105), node_list)
        end
 init do end
 end
-private class ReduceAction637
+private class ReduceAction649
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
+                                       var nodearraylist12 = p.pop
+                                       var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -22073,39 +22421,42 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwasnode3 = nodearraylist4
-                                       assert tkwasnode3 isa TKwas
-                                       var ptypenode4 = nodearraylist8
-                                       assert ptypenode4 isa PType
-                                       var pexprnode1 = new AAsCastExpr.init_aascastexpr(
+                                       assert tkwasnode3 isa nullable TKwas
+                                       var tkwnotnode4 = nodearraylist8
+                                       assert tkwnotnode4 isa nullable TKwnot
+                                       var tkwnullnode5 = nodearraylist10
+                                       assert tkwnullnode5 isa nullable TKwnull
+                                       var pexprnode1: nullable AAsNotnullExpr = new AAsNotnullExpr.init_aasnotnullexpr(
                                                pexprnode2,
                                                tkwasnode3,
-                                               ptypenode4
+                                               tkwnotnode4,
+                                               tkwnullnode5
                                        )
                                        node_list = pexprnode1
                                        p.push(p.go_to(105), node_list)
        end
 init do end
 end
-private class ReduceAction638
+private class ReduceAction650
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(106), node_list)
        end
 init do end
 end
-private class ReduceAction639
+private class ReduceAction651
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -22115,28 +22466,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -22147,39 +22498,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction640
+private class ReduceAction652
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -22190,24 +22541,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction641
+private class ReduceAction653
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(107), node_list)
        end
 init do end
 end
-private class ReduceAction642
+private class ReduceAction654
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist11 = p.pop
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
@@ -22220,18 +22571,18 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwifnode2 = nodearraylist1
-                                       assert tkwifnode2 isa TKwif
+                                       assert tkwifnode2 isa nullable TKwif
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tkwthennode4 = nodearraylist5
-                                       assert tkwthennode4 isa TKwthen
+                                       assert tkwthennode4 isa nullable TKwthen
                                        var pexprnode5 = nodearraylist7
-                                       assert pexprnode5 isa PExpr
+                                       assert pexprnode5 isa nullable PExpr
                                        var tkwelsenode6 = nodearraylist9
-                                       assert tkwelsenode6 isa TKwelse
+                                       assert tkwelsenode6 isa nullable TKwelse
                                        var pexprnode7 = nodearraylist11
-                                       assert pexprnode7 isa PExpr
-                                       var pexprnode1 = new AIfexprExpr.init_aifexprexpr(
+                                       assert pexprnode7 isa nullable PExpr
+                                       var pexprnode1: nullable AIfexprExpr = new AIfexprExpr.init_aifexprexpr(
                                                tkwifnode2,
                                                pexprnode3,
                                                tkwthennode4,
@@ -22244,33 +22595,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction643
+private class ReduceAction655
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(108), node_list)
        end
 init do end
 end
-private class ReduceAction644
+private class ReduceAction656
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOrExpr.init_aorexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOrExpr = new AOrExpr.init_aorexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22279,20 +22630,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction645
+private class ReduceAction657
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AAndExpr.init_aandexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AAndExpr = new AAndExpr.init_aandexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22301,32 +22652,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction646
+private class ReduceAction658
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(109), node_list)
        end
 init do end
 end
-private class ReduceAction647
+private class ReduceAction659
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwnotnode2 = nodearraylist1
-                                       assert tkwnotnode2 isa TKwnot
+                                       assert tkwnotnode2 isa nullable TKwnot
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ANotExpr.init_anotexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ANotExpr = new ANotExpr.init_anotexpr(
                                                tkwnotnode2,
                                                pexprnode3
                                        )
@@ -22335,33 +22686,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction648
+private class ReduceAction660
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(110), node_list)
        end
 init do end
 end
-private class ReduceAction649
+private class ReduceAction661
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AEqExpr.init_aeqexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AEqExpr = new AEqExpr.init_aeqexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22370,20 +22721,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction650
+private class ReduceAction662
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AEeExpr.init_aeeexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AEeExpr = new AEeExpr.init_aeeexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22392,20 +22743,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction651
+private class ReduceAction663
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ANeExpr.init_aneexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ANeExpr = new ANeExpr.init_aneexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22414,20 +22765,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction652
+private class ReduceAction664
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ALtExpr.init_altexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ALtExpr = new ALtExpr.init_altexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22436,20 +22787,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction653
+private class ReduceAction665
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ALeExpr.init_aleexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ALeExpr = new ALeExpr.init_aleexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22458,20 +22809,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction654
+private class ReduceAction666
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AGtExpr.init_agtexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AGtExpr = new AGtExpr.init_agtexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22480,20 +22831,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction655
+private class ReduceAction667
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AGeExpr.init_ageexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AGeExpr = new AGeExpr.init_ageexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22502,20 +22853,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction656
+private class ReduceAction668
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AStarshipExpr.init_astarshipexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AStarshipExpr = new AStarshipExpr.init_astarshipexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22524,20 +22875,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction657
+private class ReduceAction669
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var ptypenode3 = nodearraylist4
-                                       assert ptypenode3 isa PType
-                                       var pexprnode1 = new AIsaExpr.init_aisaexpr(
+                                       assert ptypenode3 isa nullable PType
+                                       var pexprnode1: nullable AIsaExpr = new AIsaExpr.init_aisaexpr(
                                                pexprnode2,
                                                ptypenode3
                                        )
@@ -22546,33 +22897,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction658
+private class ReduceAction670
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(111), node_list)
        end
 init do end
 end
-private class ReduceAction659
+private class ReduceAction671
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new APlusExpr.init_aplusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable APlusExpr = new APlusExpr.init_aplusexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22581,20 +22932,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction660
+private class ReduceAction672
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AMinusExpr.init_aminusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AMinusExpr = new AMinusExpr.init_aminusexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22603,33 +22954,33 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction661
+private class ReduceAction673
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(112), node_list)
        end
 init do end
 end
-private class ReduceAction662
+private class ReduceAction674
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AStarExpr.init_astarexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AStarExpr = new AStarExpr.init_astarexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22638,20 +22989,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction663
+private class ReduceAction675
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new ASlashExpr.init_aslashexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable ASlashExpr = new ASlashExpr.init_aslashexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22660,20 +23011,20 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction664
+private class ReduceAction676
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var pexprnode3 = nodearraylist4
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new APercentExpr.init_apercentexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable APercentExpr = new APercentExpr.init_apercentexpr(
                                                pexprnode2,
                                                pexprnode3
                                        )
@@ -22682,32 +23033,32 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction665
+private class ReduceAction677
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(113), node_list)
        end
 init do end
 end
-private class ReduceAction666
+private class ReduceAction678
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tminusnode2 = nodearraylist1
-                                       assert tminusnode2 isa TMinus
+                                       assert tminusnode2 isa nullable TMinus
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AUminusExpr.init_auminusexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AUminusExpr = new AUminusExpr.init_auminusexpr(
                                                tminusnode2,
                                                pexprnode3
                                        )
@@ -22716,19 +23067,19 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction667
+private class ReduceAction679
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var tkwoncenode2 = nodearraylist1
-                                       assert tkwoncenode2 isa TKwonce
+                                       assert tkwoncenode2 isa nullable TKwonce
                                        var pexprnode3 = nodearraylist3
-                                       assert pexprnode3 isa PExpr
-                                       var pexprnode1 = new AOnceExpr.init_aonceexpr(
+                                       assert pexprnode3 isa nullable PExpr
+                                       var pexprnode1: nullable AOnceExpr = new AOnceExpr.init_aonceexpr(
                                                tkwoncenode2,
                                                pexprnode3
                                        )
@@ -22737,43 +23088,43 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction668
+private class ReduceAction680
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(114), node_list)
        end
 init do end
 end
-private class ReduceAction669
+private class ReduceAction681
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist4 = p.pop
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var tkwnewnode2 = nodearraylist1
-                                       assert tkwnewnode2 isa TKwnew
+                                       assert tkwnewnode2 isa nullable TKwnew
                                        var ptypenode3 = nodearraylist3
-                                       assert ptypenode3 isa PType
-                                       var listnode5 = nodearraylist4 
+                                       assert ptypenode3 isa nullable PType
+                                       var listnode5 = nodearraylist4
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ANewExpr.init_anewexpr(
+#                                      end
+                                       var pexprnode1: nullable ANewExpr = new ANewExpr.init_anewexpr(
                                                tkwnewnode2,
                                                ptypenode3,
                                                null,
@@ -22784,18 +23135,42 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction670
+private class ReduceAction682
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var tkwissetnode2 = nodearraylist1
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3 = nodearraylist2
+                                       assert pexprnode3 isa nullable PExpr
+                                       var tattridnode4 = nodearraylist3
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
+                                               tkwissetnode2,
+                                               pexprnode3,
+                                               tattridnode4
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(114), node_list)
+       end
+init do end
+end
+private class ReduceAction683
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tattridnode3 = nodearraylist2
-                                       assert tattridnode3 isa TAttrid
-                                       var pexprnode1 = new AAttrExpr.init_aattrexpr(
+                                       assert tattridnode3 isa nullable TAttrid
+                                       var pexprnode1: nullable AAttrExpr = new AAttrExpr.init_aattrexpr(
                                                pexprnode2,
                                                tattridnode3
                                        )
@@ -22804,30 +23179,30 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction671
+private class ReduceAction684
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode6 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist2
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist3 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist3
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -22838,26 +23213,26 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction672
+private class ReduceAction685
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var tkwsupernode3 = nodearraylist1
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist2 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                null,
                                                tkwsupernode3,
                                                listnode5
@@ -22867,29 +23242,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction673
+private class ReduceAction686
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pqualifiednode2 = nodearraylist1
-                                       assert pqualifiednode2 isa PQualified
+                                       assert pqualifiednode2 isa nullable PQualified
                                        var tkwsupernode3 = nodearraylist2
-                                       assert tkwsupernode3 isa TKwsuper
-                                       var listnode4 = nodearraylist3 
+                                       assert tkwsupernode3 isa nullable TKwsuper
+                                       var listnode4 = nodearraylist3
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new ASuperExpr.init_asuperexpr(
+#                                      end
+                                       var pexprnode1: nullable ASuperExpr = new ASuperExpr.init_asuperexpr(
                                                pqualifiednode2,
                                                tkwsupernode3,
                                                listnode5
@@ -22899,29 +23274,29 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction674
+private class ReduceAction687
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwinitnode3 = nodearraylist2
-                                       assert tkwinitnode3 isa TKwinit
-                                       var listnode4 = nodearraylist3 
+                                       assert tkwinitnode3 isa nullable TKwinit
+                                       var listnode4 = nodearraylist3
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var pexprnode1 = new AInitExpr.init_ainitexpr(
+#                                      end
+                                       var pexprnode1: nullable AInitExpr = new AInitExpr.init_ainitexpr(
                                                pexprnode2,
                                                tkwinitnode3,
                                                listnode5
@@ -22931,11 +23306,11 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction675
+private class ReduceAction688
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist7 = p.pop
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
@@ -22945,21 +23320,21 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode6 = new Array[Object]
                                        var tkwnewnode2 = nodearraylist1
-                                       assert tkwnewnode2 isa TKwnew
+                                       assert tkwnewnode2 isa nullable TKwnew
                                        var ptypenode3 = nodearraylist3
-                                       assert ptypenode3 isa PType
+                                       assert ptypenode3 isa nullable PType
                                        var tidnode4 = nodearraylist6
-                                       assert tidnode4 isa TId
-                                       var listnode5 = nodearraylist7 
+                                       assert tidnode4 isa nullable TId
+                                       var listnode5 = nodearraylist7
                                        assert listnode5 isa Array[Object]
-                                       if listnode5 != null then
+#                                      if listnode5 != null then
                                                if listnode6.is_empty then
                                                        listnode6 = listnode5
                                                else
                                                        listnode6.append(listnode5)
                                                end
-                                       end
-                                       var pexprnode1 = new ANewExpr.init_anewexpr(
+#                                      end
+                                       var pexprnode1: nullable ANewExpr = new ANewExpr.init_anewexpr(
                                                tkwnewnode2,
                                                ptypenode3,
                                                tidnode4,
@@ -22970,15 +23345,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction676
+private class ReduceAction689
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwselfnode2 = nodearraylist1
-                                       assert tkwselfnode2 isa TKwself
-                                       var pexprnode1 = new ASelfExpr.init_aselfexpr(
+                                       assert tkwselfnode2 isa nullable TKwself
+                                       var pexprnode1: nullable ASelfExpr = new ASelfExpr.init_aselfexpr(
                                                tkwselfnode2
                                        )
                                        node_list = pexprnode1
@@ -22986,15 +23361,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction677
+private class ReduceAction690
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwtruenode2 = nodearraylist1
-                                       assert tkwtruenode2 isa TKwtrue
-                                       var pexprnode1 = new ATrueExpr.init_atrueexpr(
+                                       assert tkwtruenode2 isa nullable TKwtrue
+                                       var pexprnode1: nullable ATrueExpr = new ATrueExpr.init_atrueexpr(
                                                tkwtruenode2
                                        )
                                        node_list = pexprnode1
@@ -23002,15 +23377,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction678
+private class ReduceAction691
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwfalsenode2 = nodearraylist1
-                                       assert tkwfalsenode2 isa TKwfalse
-                                       var pexprnode1 = new AFalseExpr.init_afalseexpr(
+                                       assert tkwfalsenode2 isa nullable TKwfalse
+                                       var pexprnode1: nullable AFalseExpr = new AFalseExpr.init_afalseexpr(
                                                tkwfalsenode2
                                        )
                                        node_list = pexprnode1
@@ -23018,15 +23393,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction679
+private class ReduceAction692
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tkwnullnode2 = nodearraylist1
-                                       assert tkwnullnode2 isa TKwnull
-                                       var pexprnode1 = new ANullExpr.init_anullexpr(
+                                       assert tkwnullnode2 isa nullable TKwnull
+                                       var pexprnode1: nullable ANullExpr = new ANullExpr.init_anullexpr(
                                                tkwnullnode2
                                        )
                                        node_list = pexprnode1
@@ -23034,15 +23409,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction680
+private class ReduceAction693
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tnumbernode2 = nodearraylist1
-                                       assert tnumbernode2 isa TNumber
-                                       var pexprnode1 = new AIntExpr.init_aintexpr(
+                                       assert tnumbernode2 isa nullable TNumber
+                                       var pexprnode1: nullable AIntExpr = new AIntExpr.init_aintexpr(
                                                tnumbernode2
                                        )
                                        node_list = pexprnode1
@@ -23050,15 +23425,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction681
+private class ReduceAction694
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tfloatnode2 = nodearraylist1
-                                       assert tfloatnode2 isa TFloat
-                                       var pexprnode1 = new AFloatExpr.init_afloatexpr(
+                                       assert tfloatnode2 isa nullable TFloat
+                                       var pexprnode1: nullable AFloatExpr = new AFloatExpr.init_afloatexpr(
                                                tfloatnode2
                                        )
                                        node_list = pexprnode1
@@ -23066,15 +23441,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction682
+private class ReduceAction695
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tcharnode2 = nodearraylist1
-                                       assert tcharnode2 isa TChar
-                                       var pexprnode1 = new ACharExpr.init_acharexpr(
+                                       assert tcharnode2 isa nullable TChar
+                                       var pexprnode1: nullable ACharExpr = new ACharExpr.init_acharexpr(
                                                tcharnode2
                                        )
                                        node_list = pexprnode1
@@ -23082,15 +23457,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction683
+private class ReduceAction696
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var tstringnode2 = nodearraylist1
-                                       assert tstringnode2 isa TString
-                                       var pexprnode1 = new AStringExpr.init_astringexpr(
+                                       assert tstringnode2 isa nullable TString
+                                       var pexprnode1: nullable AStringExpr = new AStringExpr.init_astringexpr(
                                                tstringnode2
                                        )
                                        node_list = pexprnode1
@@ -23098,24 +23473,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction684
+private class ReduceAction697
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(115), node_list)
        end
 init do end
 end
-private class ReduceAction685
+private class ReduceAction698
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist10 = p.pop
                                        var nodearraylist9 = p.pop
                                        var nodearraylist8 = p.pop
@@ -23127,12 +23502,12 @@ special ReduceAction
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tkwasnode3 = nodearraylist4
-                                       assert tkwasnode3 isa TKwas
+                                       assert tkwasnode3 isa nullable TKwas
                                        var ptypenode4 = nodearraylist8
-                                       assert ptypenode4 isa PType
-                                       var pexprnode1 = new AAsCastExpr.init_aascastexpr(
+                                       assert ptypenode4 isa nullable PType
+                                       var pexprnode1: nullable AAsCastExpr = new AAsCastExpr.init_aascastexpr(
                                                pexprnode2,
                                                tkwasnode3,
                                                ptypenode4
@@ -23142,51 +23517,87 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction686
+private class ReduceAction699
+special ReduceAction
+       redef fun action(p: Parser)
+       do
+                                       var node_list: nullable Object = null
+                                       var nodearraylist12 = p.pop
+                                       var nodearraylist11 = p.pop
+                                       var nodearraylist10 = p.pop
+                                       var nodearraylist9 = p.pop
+                                       var nodearraylist8 = p.pop
+                                       var nodearraylist7 = p.pop
+                                       var nodearraylist6 = p.pop
+                                       var nodearraylist5 = p.pop
+                                       var nodearraylist4 = p.pop
+                                       var nodearraylist3 = p.pop
+                                       var nodearraylist2 = p.pop
+                                       var nodearraylist1 = p.pop
+                                       var pexprnode2 = nodearraylist1
+                                       assert pexprnode2 isa nullable PExpr
+                                       var tkwasnode3 = nodearraylist4
+                                       assert tkwasnode3 isa nullable TKwas
+                                       var tkwnotnode4 = nodearraylist8
+                                       assert tkwnotnode4 isa nullable TKwnot
+                                       var tkwnullnode5 = nodearraylist10
+                                       assert tkwnullnode5 isa nullable TKwnull
+                                       var pexprnode1: nullable AAsNotnullExpr = new AAsNotnullExpr.init_aasnotnullexpr(
+                                               pexprnode2,
+                                               tkwasnode3,
+                                               tkwnotnode4,
+                                               tkwnullnode5
+                                       )
+                                       node_list = pexprnode1
+                                       p.push(p.go_to(115), node_list)
+       end
+init do end
+end
+private class ReduceAction700
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(116), node_list)
        end
 init do end
 end
-private class ReduceAction687
+private class ReduceAction701
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
-                                       var pexprnode1 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var node_list: nullable Object = null
+                                       var pexprnode1: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        node_list = pexprnode1
                                        p.push(p.go_to(116), node_list)
        end
 init do end
 end
-private class ReduceAction688
+private class ReduceAction702
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(117), node_list)
        end
 init do end
 end
-private class ReduceAction689
+private class ReduceAction703
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -23196,28 +23607,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -23228,39 +23639,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction690
+private class ReduceAction704
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -23271,24 +23682,24 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction691
+private class ReduceAction705
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        node_list = pexprnode1
                                        p.push(p.go_to(118), node_list)
        end
 init do end
 end
-private class ReduceAction692
+private class ReduceAction706
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist6 = p.pop
                                        var nodearraylist5 = p.pop
                                        var nodearraylist4 = p.pop
@@ -23298,28 +23709,28 @@ special ReduceAction
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
                                        var pexprnode2 = nodearraylist1
-                                       assert pexprnode2 isa PExpr
+                                       assert pexprnode2 isa nullable PExpr
                                        var tidnode3 = nodearraylist4
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist5 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist5
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist6 
+#                                      end
+                                       var listnode6 = nodearraylist6
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -23330,39 +23741,39 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction693
+private class ReduceAction707
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist3 = p.pop
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var listnode7 = new Array[Object]
-                                       var pexprnode2 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       var pexprnode2: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tidnode3 = nodearraylist1
-                                       assert tidnode3 isa TId
-                                       var listnode4 = nodearraylist2 
+                                       assert tidnode3 isa nullable TId
+                                       var listnode4 = nodearraylist2
                                        assert listnode4 isa Array[Object]
-                                       if listnode4 != null then
+#                                      if listnode4 != null then
                                                if listnode5.is_empty then
                                                        listnode5 = listnode4
                                                else
                                                        listnode5.append(listnode4)
                                                end
-                                       end
-                                       var listnode6 = nodearraylist3 
+#                                      end
+                                       var listnode6 = nodearraylist3
                                        assert listnode6 isa Array[Object]
-                                       if listnode6 != null then
+#                                      if listnode6 != null then
                                                if listnode7.is_empty then
                                                        listnode7 = listnode6
                                                else
                                                        listnode7.append(listnode6)
                                                end
-                                       end
-                                       var pexprnode1 = new ACallExpr.init_acallexpr(
+#                                      end
+                                       var pexprnode1: nullable ACallExpr = new ACallExpr.init_acallexpr(
                                                pexprnode2,
                                                tidnode3,
                                                listnode5,
@@ -23373,15 +23784,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction694
+private class ReduceAction708
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pimportnode1 = nodearraylist1
-                                       assert pimportnode1 isa PImport
+                                       assert pimportnode1 isa nullable PImport
                                        if pimportnode1 != null then
                                                listnode2.add(pimportnode1)
                                        end
@@ -23390,25 +23801,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction695
+private class ReduceAction709
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var pimportnode2 = nodearraylist2
-                                       assert pimportnode2 isa PImport
-                                       if listnode1 != null then
+                                       assert pimportnode2 isa nullable PImport
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if pimportnode2 != null then
                                                listnode3.add(pimportnode2)
                                        end
@@ -23417,15 +23828,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction696
+private class ReduceAction710
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pclassdefnode1 = nodearraylist1
-                                       assert pclassdefnode1 isa PClassdef
+                                       assert pclassdefnode1 isa nullable PClassdef
                                        if pclassdefnode1 != null then
                                                listnode2.add(pclassdefnode1)
                                        end
@@ -23434,25 +23845,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction697
+private class ReduceAction711
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var pclassdefnode2 = nodearraylist2
-                                       assert pclassdefnode2 isa PClassdef
-                                       if listnode1 != null then
+                                       assert pclassdefnode2 isa nullable PClassdef
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if pclassdefnode2 != null then
                                                listnode3.add(pclassdefnode2)
                                        end
@@ -23461,15 +23872,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction698
+private class ReduceAction712
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var psuperclassnode1 = nodearraylist1
-                                       assert psuperclassnode1 isa PSuperclass
+                                       assert psuperclassnode1 isa nullable PSuperclass
                                        if psuperclassnode1 != null then
                                                listnode2.add(psuperclassnode1)
                                        end
@@ -23478,25 +23889,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction699
+private class ReduceAction713
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var psuperclassnode2 = nodearraylist2
-                                       assert psuperclassnode2 isa PSuperclass
-                                       if listnode1 != null then
+                                       assert psuperclassnode2 isa nullable PSuperclass
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if psuperclassnode2 != null then
                                                listnode3.add(psuperclassnode2)
                                        end
@@ -23505,15 +23916,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction700
+private class ReduceAction714
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pformaldefnode1 = nodearraylist1
-                                       assert pformaldefnode1 isa PFormaldef
+                                       assert pformaldefnode1 isa nullable PFormaldef
                                        if pformaldefnode1 != null then
                                                listnode2.add(pformaldefnode1)
                                        end
@@ -23522,25 +23933,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction701
+private class ReduceAction715
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var pformaldefnode2 = nodearraylist2
-                                       assert pformaldefnode2 isa PFormaldef
-                                       if listnode1 != null then
+                                       assert pformaldefnode2 isa nullable PFormaldef
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if pformaldefnode2 != null then
                                                listnode3.add(pformaldefnode2)
                                        end
@@ -23549,15 +23960,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction702
+private class ReduceAction716
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var ppropdefnode1 = nodearraylist1
-                                       assert ppropdefnode1 isa PPropdef
+                                       assert ppropdefnode1 isa nullable PPropdef
                                        if ppropdefnode1 != null then
                                                listnode2.add(ppropdefnode1)
                                        end
@@ -23566,25 +23977,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction703
+private class ReduceAction717
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var ppropdefnode2 = nodearraylist2
-                                       assert ppropdefnode2 isa PPropdef
-                                       if listnode1 != null then
+                                       assert ppropdefnode2 isa nullable PPropdef
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if ppropdefnode2 != null then
                                                listnode3.add(ppropdefnode2)
                                        end
@@ -23593,15 +24004,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction704
+private class ReduceAction718
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pparamnode1 = nodearraylist1
-                                       assert pparamnode1 isa PParam
+                                       assert pparamnode1 isa nullable PParam
                                        if pparamnode1 != null then
                                                listnode2.add(pparamnode1)
                                        end
@@ -23610,25 +24021,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction705
+private class ReduceAction719
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var pparamnode2 = nodearraylist2
-                                       assert pparamnode2 isa PParam
-                                       if listnode1 != null then
+                                       assert pparamnode2 isa nullable PParam
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if pparamnode2 != null then
                                                listnode3.add(pparamnode2)
                                        end
@@ -23637,15 +24048,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction706
+private class ReduceAction720
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pclosuredeclnode1 = nodearraylist1
-                                       assert pclosuredeclnode1 isa PClosureDecl
+                                       assert pclosuredeclnode1 isa nullable PClosureDecl
                                        if pclosuredeclnode1 != null then
                                                listnode2.add(pclosuredeclnode1)
                                        end
@@ -23654,25 +24065,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction707
+private class ReduceAction721
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var pclosuredeclnode2 = nodearraylist2
-                                       assert pclosuredeclnode2 isa PClosureDecl
-                                       if listnode1 != null then
+                                       assert pclosuredeclnode2 isa nullable PClosureDecl
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if pclosuredeclnode2 != null then
                                                listnode3.add(pclosuredeclnode2)
                                        end
@@ -23681,15 +24092,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction708
+private class ReduceAction722
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var ptypenode1 = nodearraylist1
-                                       assert ptypenode1 isa PType
+                                       assert ptypenode1 isa nullable PType
                                        if ptypenode1 != null then
                                                listnode2.add(ptypenode1)
                                        end
@@ -23698,25 +24109,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction709
+private class ReduceAction723
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var ptypenode2 = nodearraylist2
-                                       assert ptypenode2 isa PType
-                                       if listnode1 != null then
+                                       assert ptypenode2 isa nullable PType
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if ptypenode2 != null then
                                                listnode3.add(ptypenode2)
                                        end
@@ -23725,15 +24136,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction710
+private class ReduceAction724
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        if pexprnode1 != null then
                                                listnode2.add(pexprnode1)
                                        end
@@ -23742,25 +24153,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction711
+private class ReduceAction725
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var pexprnode2 = nodearraylist2
-                                       assert pexprnode2 isa PExpr
-                                       if listnode1 != null then
+                                       assert pexprnode2 isa nullable PExpr
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if pexprnode2 != null then
                                                listnode3.add(pexprnode2)
                                        end
@@ -23769,67 +24180,67 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction712
+private class ReduceAction726
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
-                                       if listnode1 != null then
+#                                      if listnode1 != null then
                                                if listnode2.is_empty then
                                                        listnode2 = listnode1
                                                else
                                                        listnode2.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode2
                                        p.push(p.go_to(128), node_list)
        end
 init do end
 end
-private class ReduceAction713
+private class ReduceAction727
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
-                                       var listnode2 = nodearraylist2 
+                                       var listnode2 = nodearraylist2
                                        assert listnode2 isa Array[Object]
-                                       if listnode1 != null then
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
-                                       if listnode2 != null then
+#                                      end
+#                                      if listnode2 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode2
                                                else
                                                        listnode3.append(listnode2)
                                                end
-                                       end
+#                                      end
                                        node_list = listnode3
                                        p.push(p.go_to(128), node_list)
        end
 init do end
 end
-private class ReduceAction714
+private class ReduceAction728
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var pexprnode1 = nodearraylist1
-                                       assert pexprnode1 isa PExpr
+                                       assert pexprnode1 isa nullable PExpr
                                        if pexprnode1 != null then
                                                listnode2.add(pexprnode1)
                                        end
@@ -23838,25 +24249,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction715
+private class ReduceAction729
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var pexprnode2 = nodearraylist2
-                                       assert pexprnode2 isa PExpr
-                                       if listnode1 != null then
+                                       assert pexprnode2 isa nullable PExpr
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if pexprnode2 != null then
                                                listnode3.add(pexprnode2)
                                        end
@@ -23865,15 +24276,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction716
+private class ReduceAction730
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var tidnode1 = nodearraylist1
-                                       assert tidnode1 isa TId
+                                       assert tidnode1 isa nullable TId
                                        if tidnode1 != null then
                                                listnode2.add(tidnode1)
                                        end
@@ -23882,25 +24293,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction717
+private class ReduceAction731
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var tidnode2 = nodearraylist2
-                                       assert tidnode2 isa TId
-                                       if listnode1 != null then
+                                       assert tidnode2 isa nullable TId
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if tidnode2 != null then
                                                listnode3.add(tidnode2)
                                        end
@@ -23909,15 +24320,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction718
+private class ReduceAction732
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var tcommentnode1 = nodearraylist1
-                                       assert tcommentnode1 isa TComment
+                                       assert tcommentnode1 isa nullable TComment
                                        if tcommentnode1 != null then
                                                listnode2.add(tcommentnode1)
                                        end
@@ -23926,25 +24337,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction719
+private class ReduceAction733
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var tcommentnode2 = nodearraylist2
-                                       assert tcommentnode2 isa TComment
-                                       if listnode1 != null then
+                                       assert tcommentnode2 isa nullable TComment
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if tcommentnode2 != null then
                                                listnode3.add(tcommentnode2)
                                        end
@@ -23953,15 +24364,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction720
+private class ReduceAction734
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var teolnode1 = nodearraylist1
-                                       assert teolnode1 isa TEol
+                                       assert teolnode1 isa nullable TEol
                                        if teolnode1 != null then
                                                listnode2.add(teolnode1)
                                        end
@@ -23970,25 +24381,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction721
+private class ReduceAction735
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var teolnode2 = nodearraylist2
-                                       assert teolnode2 isa TEol
-                                       if listnode1 != null then
+                                       assert teolnode2 isa nullable TEol
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if teolnode2 != null then
                                                listnode3.add(teolnode2)
                                        end
@@ -23997,15 +24408,15 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction722
+private class ReduceAction736
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist1 = p.pop
                                        var listnode2 = new Array[Object]
                                        var ppropdefnode1 = nodearraylist1
-                                       assert ppropdefnode1 isa PPropdef
+                                       assert ppropdefnode1 isa nullable PPropdef
                                        if ppropdefnode1 != null then
                                                listnode2.add(ppropdefnode1)
                                        end
@@ -24014,25 +24425,25 @@ special ReduceAction
        end
 init do end
 end
-private class ReduceAction723
+private class ReduceAction737
 special ReduceAction
-       redef meth action(p: Parser)
+       redef fun action(p: Parser)
        do
-                                       var node_list: Object = null
+                                       var node_list: nullable Object = null
                                        var nodearraylist2 = p.pop
                                        var nodearraylist1 = p.pop
                                        var listnode3 = new Array[Object]
-                                       var listnode1 = nodearraylist1 
+                                       var listnode1 = nodearraylist1
                                        assert listnode1 isa Array[Object]
                                        var ppropdefnode2 = nodearraylist2
-                                       assert ppropdefnode2 isa PPropdef
-                                       if listnode1 != null then
+                                       assert ppropdefnode2 isa nullable PPropdef
+#                                      if listnode1 != null then
                                                if listnode3.is_empty then
                                                        listnode3 = listnode1
                                                else
                                                        listnode3.append(listnode1)
                                                end
-                                       end
+#                                      end
                                        if ppropdefnode2 != null then
                                                listnode3.add(ppropdefnode2)
                                        end