syntax: 'meth' -> 'fun', 'attr' -> 'var'
[nit.git] / src / parser / parser.nit
index 3d5face..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,
@@ -904,12 +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
@@ -930,17 +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
@@ -952,15 +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
@@ -972,22 +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
@@ -999,25 +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
@@ -1029,22 +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
@@ -1056,25 +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
@@ -1086,32 +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
@@ -1123,35 +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
@@ -1163,26 +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
@@ -1194,9 +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
@@ -1204,26 +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
@@ -1235,29 +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
@@ -1269,9 +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
@@ -1279,29 +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
@@ -1313,36 +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
@@ -1354,46 +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
@@ -1405,9 +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
@@ -1415,29 +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
@@ -1449,9 +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
@@ -1460,38 +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
@@ -1503,36 +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
@@ -1544,46 +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
@@ -1595,9 +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
@@ -1605,29 +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
@@ -1639,9 +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
@@ -1650,38 +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
@@ -1693,46 +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
@@ -1744,9 +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
@@ -1754,46 +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
@@ -1805,9 +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
@@ -1816,38 +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
@@ -1859,9 +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
@@ -1871,47 +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
@@ -1923,18 +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
@@ -1946,21 +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
@@ -1972,28 +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
@@ -2005,31 +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
@@ -2041,28 +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
@@ -2074,31 +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
@@ -2110,38 +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
@@ -2153,9 +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
@@ -2163,31 +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
@@ -2199,9 +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
@@ -2209,22 +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
@@ -2236,9 +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
@@ -2247,31 +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
@@ -2283,9 +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
@@ -2293,25 +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
@@ -2323,9 +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
@@ -2334,34 +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
@@ -2373,42 +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
@@ -2420,9 +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
@@ -2430,42 +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
@@ -2477,9 +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
@@ -2488,34 +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
@@ -2527,9 +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
@@ -2539,43 +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
@@ -2587,42 +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
@@ -2634,9 +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
@@ -2644,42 +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
@@ -2691,9 +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
@@ -2702,34 +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
@@ -2741,9 +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
@@ -2753,43 +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
@@ -2801,9 +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
@@ -2811,42 +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
@@ -2858,9 +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
@@ -2869,51 +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
@@ -2925,9 +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
@@ -2937,43 +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
@@ -2985,9 +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
@@ -2998,52 +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
@@ -3055,21 +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
@@ -3081,9 +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
@@ -3091,12 +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
@@ -3108,9 +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
@@ -3118,12 +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
@@ -3135,17 +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
@@ -3155,9 +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)
@@ -3166,22 +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
                                        )
@@ -3192,32 +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
                                        )
@@ -3228,9 +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
@@ -3242,14 +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,
@@ -3266,9 +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
@@ -3281,16 +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,
@@ -3307,9 +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
@@ -3322,23 +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,
@@ -3355,9 +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
@@ -3371,25 +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,
@@ -3406,9 +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
@@ -3421,23 +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,
@@ -3454,9 +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
@@ -3470,25 +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,
@@ -3505,9 +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
@@ -3521,32 +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,
@@ -3563,9 +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
@@ -3580,34 +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,
@@ -3624,9 +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
@@ -3640,19 +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,
@@ -3669,9 +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
@@ -3686,28 +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,
@@ -3724,9 +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
@@ -3741,21 +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,
@@ -3772,9 +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
@@ -3790,30 +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,
@@ -3830,9 +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
@@ -3847,28 +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,
@@ -3885,9 +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
@@ -3903,37 +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,
@@ -3950,9 +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
@@ -3968,30 +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,
@@ -4008,9 +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
@@ -4027,39 +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,
@@ -4076,9 +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
@@ -4093,28 +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,
@@ -4131,9 +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
@@ -4149,37 +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,
@@ -4196,9 +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
@@ -4214,30 +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,
@@ -4254,9 +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
@@ -4273,39 +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,
@@ -4322,9 +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
@@ -4340,37 +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,
@@ -4387,9 +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
@@ -4406,46 +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,
@@ -4462,9 +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
@@ -4481,39 +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,
@@ -4530,9 +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
@@ -4550,48 +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,
@@ -4608,13 +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
@@ -4624,16 +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
                                        )
@@ -4644,13 +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
@@ -4660,13 +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
@@ -4676,9 +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
@@ -4686,7 +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
@@ -4697,9 +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
@@ -4708,19 +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
@@ -4728,14 +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
@@ -4743,13 +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
                                        )
@@ -4760,16 +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
                                        )
@@ -4780,18 +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
                                        )
@@ -4802,13 +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
@@ -4816,9 +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
@@ -4827,18 +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,
@@ -4854,9 +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
@@ -4866,20 +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,
@@ -4895,9 +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
@@ -4907,18 +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,
@@ -4934,9 +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
@@ -4947,20 +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,
@@ -4976,9 +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
@@ -4987,16 +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,
@@ -5011,9 +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
@@ -5023,18 +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,
@@ -5049,9 +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
@@ -5060,16 +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,
@@ -5084,9 +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
@@ -5096,18 +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,
@@ -5122,9 +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
@@ -5133,16 +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,
@@ -5158,9 +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
@@ -5170,18 +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,
@@ -5197,9 +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
@@ -5209,18 +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,
@@ -5236,9 +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
@@ -5249,20 +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,
@@ -5278,9 +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
@@ -5288,26 +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,
@@ -5326,9 +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
@@ -5337,28 +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,
@@ -5377,29 +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,
@@ -5418,9 +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
@@ -5429,28 +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,
@@ -5469,9 +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
@@ -5481,30 +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,
@@ -5523,9 +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
@@ -5533,22 +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,
@@ -5567,29 +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,
@@ -5608,9 +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
@@ -5618,22 +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,
@@ -5652,22 +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,
@@ -5686,9 +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
@@ -5697,28 +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,
@@ -5737,9 +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
@@ -5749,30 +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,
@@ -5791,9 +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
@@ -5801,22 +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,
@@ -5835,9 +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
@@ -5847,30 +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,
@@ -5889,9 +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
@@ -5902,32 +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,
@@ -5946,9 +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
@@ -5957,24 +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,
@@ -5993,9 +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
@@ -6003,22 +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,
@@ -6037,9 +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
@@ -6048,24 +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,
@@ -6084,25 +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,
@@ -6121,9 +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
@@ -6132,28 +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,
@@ -6172,9 +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
@@ -6184,30 +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,
@@ -6226,9 +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
@@ -6236,22 +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,
@@ -6270,9 +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
@@ -6282,30 +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,
@@ -6324,9 +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
@@ -6337,32 +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,
@@ -6381,9 +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
@@ -6392,24 +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,
@@ -6428,9 +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
@@ -6438,22 +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,
@@ -6472,9 +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
@@ -6483,24 +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,
@@ -6519,25 +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,
@@ -6556,9 +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
@@ -6568,30 +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,
@@ -6610,9 +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
@@ -6623,32 +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,
@@ -6667,9 +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
@@ -6678,24 +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,
@@ -6714,9 +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
@@ -6727,32 +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,
@@ -6771,9 +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
@@ -6785,34 +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,
@@ -6831,9 +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
@@ -6843,26 +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,
@@ -6881,9 +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
@@ -6892,24 +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,
@@ -6928,9 +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
@@ -6940,26 +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,
@@ -6978,9 +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
@@ -6988,18 +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,
@@ -7018,9 +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
@@ -7031,28 +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,
@@ -7071,9 +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
@@ -7085,30 +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,
@@ -7127,9 +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
@@ -7139,22 +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,
@@ -7173,9 +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
@@ -7187,30 +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,
@@ -7229,9 +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
@@ -7244,32 +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,
@@ -7288,9 +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
@@ -7301,24 +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,
@@ -7337,9 +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
@@ -7349,22 +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,
@@ -7383,9 +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
@@ -7396,24 +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,
@@ -7432,9 +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
@@ -7443,16 +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,
@@ -7471,9 +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
@@ -7485,30 +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,
@@ -7527,9 +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
@@ -7542,32 +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,
@@ -7586,9 +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
@@ -7599,24 +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,
@@ -7635,9 +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
@@ -7650,32 +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,
@@ -7694,9 +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
@@ -7710,34 +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,
@@ -7756,9 +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
@@ -7770,26 +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,
@@ -7808,9 +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
@@ -7821,24 +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,
@@ -7857,9 +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
@@ -7871,26 +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,
@@ -7909,9 +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
@@ -7921,18 +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,
@@ -7951,9 +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
@@ -7965,30 +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,
@@ -8007,9 +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
@@ -8022,32 +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,
@@ -8066,9 +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
@@ -8079,24 +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,
@@ -8115,9 +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
@@ -8130,32 +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,
@@ -8174,9 +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
@@ -8190,34 +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,
@@ -8236,9 +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
@@ -8250,26 +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,
@@ -8288,9 +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
@@ -8301,24 +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,
@@ -8337,9 +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
@@ -8351,26 +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,
@@ -8389,9 +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
@@ -8401,18 +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,
@@ -8431,9 +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
@@ -8446,32 +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,
@@ -8490,9 +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
@@ -8506,34 +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,
@@ -8552,9 +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
@@ -8566,26 +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,
@@ -8604,9 +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
@@ -8620,34 +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,
@@ -8666,9 +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
@@ -8683,36 +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,
@@ -8731,9 +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
@@ -8746,28 +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,
@@ -8786,9 +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
@@ -8800,26 +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,
@@ -8838,9 +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
@@ -8853,28 +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,
@@ -8893,9 +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
@@ -8906,20 +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,
@@ -8938,9 +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
@@ -8948,26 +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,
@@ -8986,9 +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
@@ -8997,28 +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,
@@ -9037,29 +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,
@@ -9078,9 +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
@@ -9089,28 +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,
@@ -9129,9 +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
@@ -9141,30 +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,
@@ -9183,9 +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
@@ -9193,22 +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,
@@ -9227,29 +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,
@@ -9268,9 +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
@@ -9278,22 +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,
@@ -9312,22 +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,
@@ -9346,9 +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
@@ -9357,28 +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,
@@ -9397,9 +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
@@ -9409,30 +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,
@@ -9451,9 +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
@@ -9461,22 +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,
@@ -9495,9 +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
@@ -9507,30 +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,
@@ -9549,9 +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
@@ -9562,32 +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,
@@ -9606,9 +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
@@ -9617,24 +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,
@@ -9653,9 +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
@@ -9663,22 +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,
@@ -9697,9 +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
@@ -9708,24 +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,
@@ -9744,25 +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,
@@ -9781,9 +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
@@ -9792,28 +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,
@@ -9832,9 +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
@@ -9844,30 +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,
@@ -9886,9 +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
@@ -9896,22 +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,
@@ -9930,9 +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
@@ -9942,30 +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,
@@ -9984,9 +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
@@ -9997,32 +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,
@@ -10041,9 +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
@@ -10052,24 +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,
@@ -10088,9 +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
@@ -10098,22 +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,
@@ -10132,9 +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
@@ -10143,24 +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,
@@ -10179,25 +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,
@@ -10216,9 +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
@@ -10228,30 +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,
@@ -10270,9 +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
@@ -10283,32 +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,
@@ -10327,9 +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
@@ -10338,24 +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,
@@ -10374,9 +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
@@ -10387,32 +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,
@@ -10431,9 +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
@@ -10445,34 +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,
@@ -10491,9 +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
@@ -10503,26 +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,
@@ -10541,9 +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
@@ -10552,24 +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,
@@ -10588,9 +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
@@ -10600,26 +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,
@@ -10638,9 +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
@@ -10648,18 +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,
@@ -10678,9 +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
@@ -10691,28 +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,
@@ -10731,9 +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
@@ -10745,30 +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,
@@ -10787,9 +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
@@ -10799,22 +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,
@@ -10833,9 +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
@@ -10847,30 +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,
@@ -10889,9 +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
@@ -10904,32 +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,
@@ -10948,9 +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
@@ -10961,24 +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,
@@ -10997,9 +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
@@ -11009,22 +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,
@@ -11043,9 +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
@@ -11056,24 +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,
@@ -11092,9 +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
@@ -11103,16 +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,
@@ -11131,9 +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
@@ -11145,30 +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,
@@ -11187,9 +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
@@ -11202,32 +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,
@@ -11246,9 +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
@@ -11259,24 +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,
@@ -11295,9 +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
@@ -11310,32 +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,
@@ -11354,9 +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
@@ -11370,34 +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,
@@ -11416,9 +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
@@ -11430,26 +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,
@@ -11468,9 +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
@@ -11481,24 +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,
@@ -11517,9 +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
@@ -11531,26 +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,
@@ -11569,9 +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
@@ -11581,18 +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,
@@ -11611,9 +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
@@ -11625,30 +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,
@@ -11667,9 +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
@@ -11682,32 +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,
@@ -11726,9 +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
@@ -11739,24 +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,
@@ -11775,9 +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
@@ -11790,32 +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,
@@ -11834,9 +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
@@ -11850,34 +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,
@@ -11896,9 +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
@@ -11910,26 +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,
@@ -11948,9 +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
@@ -11961,24 +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,
@@ -11997,9 +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
@@ -12011,26 +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,
@@ -12049,9 +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
@@ -12061,18 +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,
@@ -12091,9 +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
@@ -12106,32 +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,
@@ -12150,9 +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
@@ -12166,34 +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,
@@ -12212,9 +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
@@ -12226,26 +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,
@@ -12264,9 +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
@@ -12280,34 +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,
@@ -12326,9 +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
@@ -12343,36 +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,
@@ -12391,9 +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
@@ -12406,28 +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,
@@ -12446,9 +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
@@ -12460,26 +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,
@@ -12498,9 +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
@@ -12513,28 +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,
@@ -12553,9 +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
@@ -12566,20 +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,
@@ -12598,9 +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
@@ -12608,16 +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,
@@ -12633,9 +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
@@ -12644,18 +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,
@@ -12671,9 +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
@@ -12682,18 +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,
@@ -12709,9 +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
@@ -12721,20 +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,
@@ -12750,9 +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
@@ -12761,16 +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,
@@ -12786,9 +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
@@ -12798,18 +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,
@@ -12825,9 +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
@@ -12837,18 +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,
@@ -12864,9 +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
@@ -12877,20 +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,
@@ -12906,25 +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,
@@ -12939,9 +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
@@ -12949,18 +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,
@@ -12975,10 +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)
@@ -12987,14 +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
@@ -13004,14 +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
@@ -13021,14 +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
@@ -13038,13 +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
@@ -13054,13 +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
@@ -13070,13 +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
@@ -13086,13 +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
@@ -13102,13 +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
@@ -13118,13 +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
@@ -13134,13 +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
@@ -13150,13 +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
@@ -13166,13 +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
@@ -13182,13 +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
@@ -13198,13 +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
@@ -13214,13 +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
@@ -13230,16 +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
                                        )
@@ -13250,13 +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
@@ -13266,16 +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
                                        )
@@ -13286,19 +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
@@ -13310,22 +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
@@ -13337,32 +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
@@ -13374,25 +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
@@ -13404,35 +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
@@ -13444,13 +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
@@ -13462,23 +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
@@ -13490,16 +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
@@ -13511,26 +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
@@ -13542,12 +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
@@ -13559,22 +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
@@ -13586,15 +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
@@ -13606,25 +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
@@ -13636,9 +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
@@ -13646,7 +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
@@ -13657,9 +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
@@ -13668,19 +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
@@ -13688,9 +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
@@ -13702,14 +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
@@ -13717,13 +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
@@ -13735,16 +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
@@ -13756,19 +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
@@ -13780,21 +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
@@ -13802,21 +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,
@@ -13830,9 +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
@@ -13840,14 +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,
@@ -13861,9 +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
@@ -13872,14 +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,
@@ -13893,9 +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
@@ -13905,16 +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,
@@ -13928,14 +13927,14 @@ 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 listnode4 = new Array[Object]
                                        var tclassidnode3 = nodearraylist1
-                                       assert tclassidnode3 isa TClassid
-                                       var ptypenode1 = new AType.init_atype(
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var ptypenode1: nullable AType = new AType.init_atype(
                                                null,
                                                tclassidnode3,
                                                listnode4
@@ -13947,17 +13946,17 @@ init do end
 end
 private class ReduceAction301
 special 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 TKwnullable
+                                       assert tkwnullablenode2 isa nullable TKwnullable
                                        var tclassidnode3 = nodearraylist2
-                                       assert tclassidnode3 isa TClassid
-                                       var ptypenode1 = new AType.init_atype(
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var ptypenode1: nullable AType = new AType.init_atype(
                                                tkwnullablenode2,
                                                tclassidnode3,
                                                listnode4
@@ -13969,9 +13968,9 @@ init do end
 end
 private class ReduceAction302
 special 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
@@ -13980,17 +13979,17 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var tclassidnode3 = nodearraylist1
-                                       assert tclassidnode3 isa TClassid
-                                       var listnode4 = nodearraylist4 
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var listnode4 = nodearraylist4
                                        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 ptypenode1 = new AType.init_atype(
+#                                      end
+                                       var ptypenode1: nullable AType = new AType.init_atype(
                                                null,
                                                tclassidnode3,
                                                listnode5
@@ -14002,9 +14001,9 @@ init do end
 end
 private class ReduceAction303
 special 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
@@ -14014,19 +14013,19 @@ special ReduceAction
                                        var nodearraylist1 = p.pop
                                        var listnode5 = new Array[Object]
                                        var tkwnullablenode2 = nodearraylist1
-                                       assert tkwnullablenode2 isa TKwnullable
+                                       assert tkwnullablenode2 isa nullable TKwnullable
                                        var tclassidnode3 = nodearraylist2
-                                       assert tclassidnode3 isa TClassid
-                                       var listnode4 = nodearraylist5 
+                                       assert tclassidnode3 isa nullable TClassid
+                                       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 ptypenode1 = new AType.init_atype(
+#                                      end
+                                       var ptypenode1: nullable AType = new AType.init_atype(
                                                tkwnullablenode2,
                                                tclassidnode3,
                                                listnode5
@@ -14038,13 +14037,13 @@ 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
@@ -14055,26 +14054,26 @@ init do end
 end
 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
@@ -14082,14 +14081,14 @@ init do end
 end
 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
@@ -14097,14 +14096,14 @@ init do end
 end
 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
@@ -14112,12 +14111,12 @@ init do end
 end
 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
@@ -14125,20 +14124,20 @@ init do end
 end
 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
@@ -14148,9 +14147,9 @@ init do end
 end
 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
@@ -14158,20 +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
@@ -14181,13 +14180,13 @@ init do end
 end
 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
@@ -14197,12 +14196,12 @@ init do end
 end
 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
@@ -14212,13 +14211,13 @@ init do end
 end
 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
@@ -14226,12 +14225,12 @@ init do end
 end
 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
@@ -14239,12 +14238,12 @@ init do end
 end
 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
@@ -14252,13 +14251,13 @@ init do end
 end
 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
                                        )
@@ -14269,16 +14268,16 @@ init do end
 end
 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
                                        )
@@ -14289,13 +14288,13 @@ init do end
 end
 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
                                        )
@@ -14306,16 +14305,16 @@ init do end
 end
 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
                                        )
@@ -14326,13 +14325,13 @@ init do end
 end
 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
@@ -14342,13 +14341,13 @@ init do end
 end
 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
                                        )
@@ -14359,16 +14358,16 @@ init do end
 end
 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
                                        )
@@ -14379,12 +14378,12 @@ init do end
 end
 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
@@ -14392,12 +14391,12 @@ init do end
 end
 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
@@ -14405,12 +14404,12 @@ init do end
 end
 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
@@ -14418,12 +14417,12 @@ init do end
 end
 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
@@ -14431,12 +14430,12 @@ init do end
 end
 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
@@ -14444,9 +14443,9 @@ init do end
 end
 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
@@ -14455,19 +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,
@@ -14480,27 +14479,27 @@ init do end
 end
 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,
@@ -14513,9 +14512,9 @@ init do end
 end
 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
@@ -14525,28 +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,
@@ -14559,37 +14558,37 @@ init do end
 end
 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,
@@ -14602,24 +14601,24 @@ init do end
 end
 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
@@ -14631,27 +14630,27 @@ init do end
 end
 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
@@ -14663,9 +14662,9 @@ init do end
 end
 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
@@ -14673,19 +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
@@ -14697,26 +14696,26 @@ init do end
 end
 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
@@ -14728,13 +14727,13 @@ init do end
 end
 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
@@ -14745,26 +14744,26 @@ init do end
 end
 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
@@ -14772,20 +14771,20 @@ init do end
 end
 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,
@@ -14798,30 +14797,30 @@ init do end
 end
 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,
@@ -14834,9 +14833,9 @@ init do end
 end
 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
@@ -14844,19 +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,
@@ -14869,9 +14868,9 @@ init do end
 end
 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
@@ -14880,28 +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,
@@ -14914,9 +14913,9 @@ init do end
 end
 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
@@ -14925,28 +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,
@@ -14959,9 +14958,9 @@ init do end
 end
 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
@@ -14971,37 +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,
@@ -15014,18 +15013,18 @@ init do end
 end
 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,
@@ -15038,28 +15037,28 @@ init do end
 end
 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,
@@ -15072,16 +15071,16 @@ init do end
 end
 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,
@@ -15095,19 +15094,19 @@ init do end
 end
 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,
@@ -15121,23 +15120,23 @@ init do end
 end
 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,
@@ -15151,9 +15150,9 @@ init do end
 end
 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
@@ -15161,16 +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,
@@ -15184,9 +15183,9 @@ init do end
 end
 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
@@ -15194,14 +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,
@@ -15214,21 +15213,21 @@ init do end
 end
 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,
@@ -15241,9 +15240,9 @@ init do end
 end
 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
@@ -15253,23 +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,
@@ -15283,32 +15282,32 @@ init do end
 end
 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,
@@ -15322,30 +15321,30 @@ init do end
 end
 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,
@@ -15358,9 +15357,9 @@ init do end
 end
 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
@@ -15368,14 +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,
@@ -15388,21 +15387,21 @@ init do end
 end
 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,
@@ -15415,9 +15414,9 @@ init do end
 end
 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
@@ -15427,23 +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,
@@ -15457,32 +15456,32 @@ init do end
 end
 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,
@@ -15496,30 +15495,30 @@ init do end
 end
 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,
@@ -15532,13 +15531,13 @@ init do end
 end
 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
@@ -15548,13 +15547,13 @@ init do end
 end
 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
@@ -15564,16 +15563,16 @@ init do end
 end
 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
                                        )
@@ -15584,9 +15583,9 @@ init do end
 end
 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
@@ -15596,14 +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,
@@ -15616,9 +15615,9 @@ init do end
 end
 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
@@ -15626,12 +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,
@@ -15644,9 +15643,9 @@ init do end
 end
 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
@@ -15657,21 +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,
@@ -15684,9 +15683,9 @@ init do end
 end
 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
@@ -15698,30 +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,
@@ -15734,9 +15733,9 @@ init do end
 end
 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
@@ -15744,12 +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,
@@ -15762,9 +15761,9 @@ init do end
 end
 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
@@ -15773,12 +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,
@@ -15791,13 +15790,13 @@ init do end
 end
 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
@@ -15805,9 +15804,9 @@ init do end
 end
 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)
@@ -15816,9 +15815,9 @@ init do end
 end
 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
@@ -15826,14 +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,
@@ -15846,9 +15845,9 @@ init do end
 end
 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
@@ -15860,16 +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,
@@ -15883,16 +15882,16 @@ init do end
 end
 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
@@ -15904,19 +15903,19 @@ init do end
 end
 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
@@ -15928,13 +15927,13 @@ init do end
 end
 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
@@ -15942,12 +15941,12 @@ init do end
 end
 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
@@ -15955,9 +15954,9 @@ init do end
 end
 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
@@ -15967,28 +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,
@@ -16001,37 +16000,37 @@ init do end
 end
 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,
@@ -16044,35 +16043,35 @@ init do end
 end
 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
@@ -16084,12 +16083,12 @@ init do end
 end
 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
@@ -16097,9 +16096,9 @@ init do end
 end
 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
@@ -16112,18 +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,
@@ -16138,12 +16137,12 @@ init do end
 end
 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
@@ -16151,18 +16150,18 @@ init do end
 end
 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
                                        )
@@ -16173,18 +16172,18 @@ init do end
 end
 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
                                        )
@@ -16195,12 +16194,12 @@ init do end
 end
 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
@@ -16208,17 +16207,17 @@ init do end
 end
 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
                                        )
@@ -16229,12 +16228,12 @@ init do end
 end
 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
@@ -16242,18 +16241,18 @@ init do end
 end
 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
                                        )
@@ -16264,18 +16263,18 @@ init do end
 end
 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
                                        )
@@ -16286,18 +16285,18 @@ init do end
 end
 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
                                        )
@@ -16308,18 +16307,18 @@ init do end
 end
 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
                                        )
@@ -16330,18 +16329,18 @@ init do end
 end
 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
                                        )
@@ -16352,18 +16351,18 @@ init do end
 end
 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
                                        )
@@ -16374,18 +16373,18 @@ init do end
 end
 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
                                        )
@@ -16396,18 +16395,18 @@ init do end
 end
 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
                                        )
@@ -16418,18 +16417,18 @@ init do end
 end
 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
                                        )
@@ -16440,12 +16439,12 @@ init do end
 end
 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
@@ -16453,18 +16452,18 @@ init do end
 end
 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
                                        )
@@ -16475,18 +16474,18 @@ init do end
 end
 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
                                        )
@@ -16497,12 +16496,12 @@ init do end
 end
 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
@@ -16510,18 +16509,18 @@ init do end
 end
 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
                                        )
@@ -16532,18 +16531,18 @@ init do end
 end
 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
                                        )
@@ -16554,18 +16553,18 @@ init do end
 end
 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
                                        )
@@ -16576,12 +16575,12 @@ init do end
 end
 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
@@ -16589,17 +16588,17 @@ init do end
 end
 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
                                        )
@@ -16610,17 +16609,17 @@ init do end
 end
 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
                                        )
@@ -16631,12 +16630,12 @@ init do end
 end
 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
@@ -16644,28 +16643,28 @@ init do end
 end
 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,
@@ -16678,21 +16677,21 @@ init do end
 end
 private class ReduceAction409
 special 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 TKwisset
+                                       assert tkwissetnode2 isa nullable TKwisset
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tattridnode4 = nodearraylist5
-                                       assert tattridnode4 isa TAttrid
-                                       var pexprnode1 = new AIssetAttrExpr.init_aissetattrexpr(
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
                                                tkwissetnode2,
                                                pexprnode3,
                                                tattridnode4
@@ -16704,18 +16703,18 @@ init do end
 end
 private class ReduceAction410
 special 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 tkwissetnode2 = nodearraylist1
-                                       assert tkwissetnode2 isa TKwisset
-                                       var pexprnode3 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode4 = nodearraylist2
-                                       assert tattridnode4 isa TAttrid
-                                       var pexprnode1 = new AIssetAttrExpr.init_aissetattrexpr(
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
                                                tkwissetnode2,
                                                pexprnode3,
                                                tattridnode4
@@ -16727,18 +16726,18 @@ 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
                                        )
@@ -16749,15 +16748,15 @@ init do end
 end
 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
                                        )
@@ -16768,9 +16767,9 @@ init do end
 end
 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
@@ -16779,19 +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,
@@ -16804,27 +16803,27 @@ init do end
 end
 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,
@@ -16837,24 +16836,24 @@ init do end
 end
 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
@@ -16866,27 +16865,27 @@ init do end
 end
 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
@@ -16898,9 +16897,9 @@ init do end
 end
 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
@@ -16908,19 +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
@@ -16932,26 +16931,26 @@ init do end
 end
 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
@@ -16963,25 +16962,25 @@ init do end
 end
 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
@@ -16993,9 +16992,9 @@ init do end
 end
 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
@@ -17005,21 +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,
@@ -17032,9 +17031,9 @@ init do end
 end
 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
@@ -17045,10 +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
                                        )
@@ -17059,9 +17058,9 @@ init do end
 end
 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
@@ -17072,10 +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
                                        )
@@ -17086,21 +17085,21 @@ init do end
 end
 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
@@ -17110,13 +17109,13 @@ init do end
 end
 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
@@ -17126,13 +17125,13 @@ init do end
 end
 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
@@ -17142,13 +17141,13 @@ init do end
 end
 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
@@ -17158,13 +17157,13 @@ init do end
 end
 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
@@ -17174,13 +17173,13 @@ init do end
 end
 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
@@ -17190,13 +17189,13 @@ init do end
 end
 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
@@ -17206,13 +17205,13 @@ init do end
 end
 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
@@ -17222,13 +17221,13 @@ init do end
 end
 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
@@ -17238,12 +17237,12 @@ init do end
 end
 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
@@ -17251,14 +17250,14 @@ init do end
 end
 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
@@ -17266,9 +17265,9 @@ init do end
 end
 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
@@ -17280,12 +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
@@ -17297,9 +17296,9 @@ init do end
 end
 private class ReduceAction435
 special 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
@@ -17313,14 +17312,14 @@ 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 tkwnotnode4 = nodearraylist8
-                                       assert tkwnotnode4 isa TKwnot
+                                       assert tkwnotnode4 isa nullable TKwnot
                                        var tkwnullnode5 = nodearraylist10
-                                       assert tkwnullnode5 isa TKwnull
-                                       var pexprnode1 = new AAsNotnullExpr.init_aasnotnullexpr(
+                                       assert tkwnullnode5 isa nullable TKwnull
+                                       var pexprnode1: nullable AAsNotnullExpr = new AAsNotnullExpr.init_aasnotnullexpr(
                                                pexprnode2,
                                                tkwasnode3,
                                                tkwnotnode4,
@@ -17333,27 +17332,27 @@ init do end
 end
 private class ReduceAction436
 special 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 listnode2 = nodearraylist1 
+                                       var listnode2 = nodearraylist1
                                        assert listnode2 isa Array[Object]
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
-                                       if listnode2 != null then
+                                       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
@@ -17363,37 +17362,37 @@ init do end
 end
 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
@@ -17403,18 +17402,18 @@ init do end
 end
 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
@@ -17428,13 +17427,13 @@ init do end
 end
 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
@@ -17444,18 +17443,18 @@ init do end
 end
 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
@@ -17469,13 +17468,13 @@ init do end
 end
 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
@@ -17485,13 +17484,13 @@ init do end
 end
 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
@@ -17501,9 +17500,9 @@ init do end
 end
 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
@@ -17511,7 +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
@@ -17522,9 +17521,9 @@ init do end
 end
 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
@@ -17533,19 +17532,19 @@ 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
@@ -17553,9 +17552,9 @@ init do end
 end
 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
@@ -17567,9 +17566,9 @@ init do end
 end
 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)
@@ -17578,9 +17577,9 @@ init do end
 end
 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
@@ -17588,7 +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
@@ -17599,9 +17598,9 @@ init do end
 end
 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
@@ -17610,19 +17609,19 @@ 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
@@ -17630,13 +17629,13 @@ init do end
 end
 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
@@ -17647,9 +17646,9 @@ init do end
 end
 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
@@ -17661,9 +17660,9 @@ init do end
 end
 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)
@@ -17672,9 +17671,9 @@ init do end
 end
 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
@@ -17682,7 +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
@@ -17693,9 +17692,9 @@ init do end
 end
 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
@@ -17704,19 +17703,19 @@ 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
@@ -17724,15 +17723,15 @@ init do end
 end
 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
@@ -17740,13 +17739,13 @@ init do end
 end
 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
@@ -17757,26 +17756,26 @@ init do end
 end
 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
@@ -17787,14 +17786,14 @@ init do end
 end
 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
                                        )
@@ -17805,24 +17804,24 @@ init do end
 end
 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
                                        )
@@ -17833,21 +17832,21 @@ init do end
 end
 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
                                        )
@@ -17858,14 +17857,14 @@ init do end
 end
 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
@@ -17873,14 +17872,14 @@ init do end
 end
 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
@@ -17888,9 +17887,9 @@ init do end
 end
 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
@@ -17898,9 +17897,9 @@ init do end
 end
 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
@@ -17908,21 +17907,21 @@ init do end
 end
 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
@@ -17932,22 +17931,22 @@ init do end
 end
 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
@@ -17957,9 +17956,9 @@ init do end
 end
 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)
@@ -17968,9 +17967,9 @@ init do end
 end
 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
@@ -17978,12 +17977,12 @@ init do end
 end
 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
@@ -17991,9 +17990,9 @@ init do end
 end
 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)
@@ -18002,9 +18001,9 @@ init do end
 end
 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
@@ -18014,9 +18013,9 @@ init do end
 end
 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
@@ -18024,13 +18023,13 @@ init do end
 end
 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
@@ -18038,9 +18037,9 @@ init do end
 end
 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
@@ -18049,18 +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,
@@ -18076,9 +18075,9 @@ init do end
 end
 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
@@ -18088,20 +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,
@@ -18117,9 +18116,9 @@ init do end
 end
 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
@@ -18129,18 +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,
@@ -18156,9 +18155,9 @@ init do end
 end
 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
@@ -18169,20 +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,
@@ -18198,9 +18197,9 @@ init do end
 end
 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
@@ -18209,16 +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,
@@ -18234,9 +18233,9 @@ init do end
 end
 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
@@ -18246,18 +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,
@@ -18273,9 +18272,9 @@ init do end
 end
 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
@@ -18285,18 +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,
@@ -18312,9 +18311,9 @@ init do end
 end
 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
@@ -18325,20 +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,
@@ -18354,14 +18353,14 @@ init do end
 end
 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 listnode4 = new Array[Object]
                                        var tclassidnode3 = nodearraylist1
-                                       assert tclassidnode3 isa TClassid
-                                       var ptypenode1 = new AType.init_atype(
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var ptypenode1: nullable AType = new AType.init_atype(
                                                null,
                                                tclassidnode3,
                                                listnode4
@@ -18373,17 +18372,17 @@ init do end
 end
 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 TKwnullable
+                                       assert tkwnullablenode2 isa nullable TKwnullable
                                        var tclassidnode3 = nodearraylist2
-                                       assert tclassidnode3 isa TClassid
-                                       var ptypenode1 = new AType.init_atype(
+                                       assert tclassidnode3 isa nullable TClassid
+                                       var ptypenode1: nullable AType = new AType.init_atype(
                                                tkwnullablenode2,
                                                tclassidnode3,
                                                listnode4
@@ -18395,12 +18394,12 @@ init do end
 end
 private class ReduceAction483
 special 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(73), node_list)
        end
@@ -18408,9 +18407,9 @@ init do end
 end
 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
@@ -18420,28 +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,
@@ -18454,37 +18453,37 @@ init do end
 end
 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,
@@ -18497,12 +18496,12 @@ init do end
 end
 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
@@ -18510,9 +18509,9 @@ init do end
 end
 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
@@ -18525,18 +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,
@@ -18551,12 +18550,12 @@ init do end
 end
 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
@@ -18564,18 +18563,18 @@ init do end
 end
 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
                                        )
@@ -18586,18 +18585,18 @@ init do end
 end
 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
                                        )
@@ -18608,12 +18607,12 @@ init do end
 end
 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
@@ -18621,17 +18620,17 @@ init do end
 end
 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
                                        )
@@ -18642,12 +18641,12 @@ init do end
 end
 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
@@ -18655,18 +18654,18 @@ init do end
 end
 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
                                        )
@@ -18677,18 +18676,18 @@ init do end
 end
 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
                                        )
@@ -18699,18 +18698,18 @@ init do end
 end
 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
                                        )
@@ -18721,18 +18720,18 @@ init do end
 end
 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
                                        )
@@ -18743,18 +18742,18 @@ init do end
 end
 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
                                        )
@@ -18765,18 +18764,18 @@ init do end
 end
 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
                                        )
@@ -18787,18 +18786,18 @@ init do end
 end
 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
                                        )
@@ -18809,18 +18808,18 @@ init do end
 end
 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
                                        )
@@ -18831,18 +18830,18 @@ init do end
 end
 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
                                        )
@@ -18853,12 +18852,12 @@ init do end
 end
 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
@@ -18866,18 +18865,18 @@ init do end
 end
 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
                                        )
@@ -18888,18 +18887,18 @@ init do end
 end
 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
                                        )
@@ -18910,12 +18909,12 @@ init do end
 end
 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
@@ -18923,18 +18922,18 @@ init do end
 end
 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
                                        )
@@ -18945,18 +18944,18 @@ init do end
 end
 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
                                        )
@@ -18967,18 +18966,18 @@ init do end
 end
 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
                                        )
@@ -18989,12 +18988,12 @@ init do end
 end
 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
@@ -19002,17 +19001,17 @@ init do end
 end
 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
                                        )
@@ -19023,17 +19022,17 @@ init do end
 end
 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
                                        )
@@ -19044,12 +19043,12 @@ init do end
 end
 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
@@ -19057,28 +19056,28 @@ init do end
 end
 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,
@@ -19091,21 +19090,21 @@ init do end
 end
 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 TKwisset
+                                       assert tkwissetnode2 isa nullable TKwisset
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tattridnode4 = nodearraylist5
-                                       assert tattridnode4 isa TAttrid
-                                       var pexprnode1 = new AIssetAttrExpr.init_aissetattrexpr(
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
                                                tkwissetnode2,
                                                pexprnode3,
                                                tattridnode4
@@ -19117,18 +19116,18 @@ init do end
 end
 private class ReduceAction516
 special 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 tkwissetnode2 = nodearraylist1
-                                       assert tkwissetnode2 isa TKwisset
-                                       var pexprnode3 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode4 = nodearraylist2
-                                       assert tattridnode4 isa TAttrid
-                                       var pexprnode1 = new AIssetAttrExpr.init_aissetattrexpr(
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
                                                tkwissetnode2,
                                                pexprnode3,
                                                tattridnode4
@@ -19140,18 +19139,18 @@ init do end
 end
 private class ReduceAction517
 special 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
                                        )
@@ -19162,15 +19161,15 @@ init do end
 end
 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
                                        )
@@ -19181,9 +19180,9 @@ init do end
 end
 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
@@ -19192,19 +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,
@@ -19217,27 +19216,27 @@ init do end
 end
 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,
@@ -19250,24 +19249,24 @@ init do end
 end
 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
@@ -19279,27 +19278,27 @@ init do end
 end
 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
@@ -19311,9 +19310,9 @@ init do end
 end
 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
@@ -19321,19 +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
@@ -19345,26 +19344,26 @@ init do end
 end
 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
@@ -19376,9 +19375,9 @@ init do end
 end
 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
@@ -19388,21 +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,
@@ -19415,13 +19414,13 @@ init do end
 end
 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
@@ -19431,13 +19430,13 @@ init do end
 end
 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
@@ -19447,13 +19446,13 @@ init do end
 end
 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
@@ -19463,13 +19462,13 @@ init do end
 end
 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
@@ -19479,13 +19478,13 @@ init do end
 end
 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
@@ -19495,13 +19494,13 @@ init do end
 end
 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
@@ -19511,13 +19510,13 @@ init do end
 end
 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
@@ -19527,13 +19526,13 @@ init do end
 end
 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
@@ -19543,12 +19542,12 @@ init do end
 end
 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
@@ -19556,14 +19555,14 @@ init do end
 end
 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
@@ -19571,9 +19570,9 @@ init do end
 end
 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
@@ -19585,12 +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
@@ -19602,9 +19601,9 @@ init do end
 end
 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
@@ -19618,14 +19617,14 @@ 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 tkwnotnode4 = nodearraylist8
-                                       assert tkwnotnode4 isa TKwnot
+                                       assert tkwnotnode4 isa nullable TKwnot
                                        var tkwnullnode5 = nodearraylist10
-                                       assert tkwnullnode5 isa TKwnull
-                                       var pexprnode1 = new AAsNotnullExpr.init_aasnotnullexpr(
+                                       assert tkwnullnode5 isa nullable TKwnull
+                                       var pexprnode1: nullable AAsNotnullExpr = new AAsNotnullExpr.init_aasnotnullexpr(
                                                pexprnode2,
                                                tkwasnode3,
                                                tkwnotnode4,
@@ -19638,12 +19637,12 @@ init do end
 end
 private class ReduceAction538
 special 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(83), node_list)
        end
@@ -19651,20 +19650,20 @@ init do end
 end
 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
@@ -19674,9 +19673,9 @@ init do end
 end
 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
@@ -19684,20 +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
@@ -19707,13 +19706,13 @@ init do end
 end
 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
@@ -19723,12 +19722,12 @@ init do end
 end
 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
@@ -19738,12 +19737,12 @@ init do end
 end
 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
@@ -19751,12 +19750,12 @@ init do end
 end
 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
@@ -19764,13 +19763,13 @@ init do end
 end
 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
                                        )
@@ -19781,16 +19780,16 @@ init do end
 end
 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
                                        )
@@ -19801,13 +19800,13 @@ init do end
 end
 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
                                        )
@@ -19818,16 +19817,16 @@ init do end
 end
 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
                                        )
@@ -19838,13 +19837,13 @@ init do end
 end
 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
@@ -19854,13 +19853,13 @@ init do end
 end
 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
                                        )
@@ -19871,16 +19870,16 @@ init do end
 end
 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
                                        )
@@ -19891,12 +19890,12 @@ init do end
 end
 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
@@ -19904,12 +19903,12 @@ init do end
 end
 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
@@ -19917,12 +19916,12 @@ init do end
 end
 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
@@ -19930,12 +19929,12 @@ init do end
 end
 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
@@ -19943,12 +19942,12 @@ init do end
 end
 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
@@ -19956,9 +19955,9 @@ init do end
 end
 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
@@ -19967,19 +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,
@@ -19992,27 +19991,27 @@ init do end
 end
 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,
@@ -20025,9 +20024,9 @@ init do end
 end
 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
@@ -20037,28 +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,
@@ -20071,37 +20070,37 @@ init do end
 end
 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,
@@ -20114,24 +20113,24 @@ init do end
 end
 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
@@ -20143,27 +20142,27 @@ init do end
 end
 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
@@ -20175,9 +20174,9 @@ init do end
 end
 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
@@ -20185,19 +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
@@ -20209,26 +20208,26 @@ init do end
 end
 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
@@ -20240,13 +20239,13 @@ init do end
 end
 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
@@ -20257,26 +20256,26 @@ init do end
 end
 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
@@ -20284,20 +20283,20 @@ init do end
 end
 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,
@@ -20310,30 +20309,30 @@ init do end
 end
 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,
@@ -20346,16 +20345,16 @@ init do end
 end
 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,
@@ -20369,19 +20368,19 @@ init do end
 end
 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,
@@ -20395,23 +20394,23 @@ init do end
 end
 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,
@@ -20425,9 +20424,9 @@ init do end
 end
 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
@@ -20435,16 +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,
@@ -20458,9 +20457,9 @@ init do end
 end
 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
@@ -20468,14 +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,
@@ -20488,21 +20487,21 @@ init do end
 end
 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,
@@ -20515,9 +20514,9 @@ init do end
 end
 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
@@ -20527,23 +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,
@@ -20557,32 +20556,32 @@ init do end
 end
 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,
@@ -20596,30 +20595,30 @@ init do end
 end
 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,
@@ -20632,9 +20631,9 @@ init do end
 end
 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
@@ -20642,14 +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,
@@ -20662,21 +20661,21 @@ init do end
 end
 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,
@@ -20689,9 +20688,9 @@ init do end
 end
 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
@@ -20701,23 +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,
@@ -20731,32 +20730,32 @@ init do end
 end
 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,
@@ -20770,30 +20769,30 @@ init do end
 end
 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,
@@ -20806,16 +20805,16 @@ init do end
 end
 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
                                        )
@@ -20826,9 +20825,9 @@ init do end
 end
 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
@@ -20838,14 +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,
@@ -20858,9 +20857,9 @@ init do end
 end
 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
@@ -20868,14 +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,
@@ -20888,9 +20887,9 @@ init do end
 end
 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
@@ -20902,16 +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,
@@ -20925,16 +20924,16 @@ init do end
 end
 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
@@ -20946,19 +20945,19 @@ init do end
 end
 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
@@ -20970,12 +20969,12 @@ init do end
 end
 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
@@ -20983,9 +20982,9 @@ init do end
 end
 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
@@ -20995,28 +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,
@@ -21029,37 +21028,37 @@ init do end
 end
 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,
@@ -21072,35 +21071,35 @@ init do end
 end
 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
@@ -21112,12 +21111,12 @@ init do end
 end
 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
@@ -21125,9 +21124,9 @@ init do end
 end
 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
@@ -21137,28 +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,
@@ -21171,37 +21170,37 @@ init do end
 end
 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,
@@ -21214,12 +21213,12 @@ init do end
 end
 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
@@ -21227,9 +21226,9 @@ init do end
 end
 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
@@ -21239,28 +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,
@@ -21273,37 +21272,37 @@ init do end
 end
 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,
@@ -21316,12 +21315,12 @@ init do end
 end
 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
@@ -21329,9 +21328,9 @@ init do end
 end
 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
@@ -21344,18 +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,
@@ -21370,12 +21369,12 @@ init do end
 end
 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
@@ -21383,18 +21382,18 @@ init do end
 end
 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
                                        )
@@ -21405,18 +21404,18 @@ init do end
 end
 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
                                        )
@@ -21427,12 +21426,12 @@ init do end
 end
 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
@@ -21440,17 +21439,17 @@ init do end
 end
 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
                                        )
@@ -21461,12 +21460,12 @@ init do end
 end
 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
@@ -21474,18 +21473,18 @@ init do end
 end
 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
                                        )
@@ -21496,18 +21495,18 @@ init do end
 end
 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
                                        )
@@ -21518,18 +21517,18 @@ init do end
 end
 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
                                        )
@@ -21540,18 +21539,18 @@ init do end
 end
 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
                                        )
@@ -21562,18 +21561,18 @@ init do end
 end
 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
                                        )
@@ -21584,18 +21583,18 @@ init do end
 end
 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
                                        )
@@ -21606,18 +21605,18 @@ init do end
 end
 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
                                        )
@@ -21628,18 +21627,18 @@ init do end
 end
 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
                                        )
@@ -21650,18 +21649,18 @@ init do end
 end
 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
                                        )
@@ -21672,12 +21671,12 @@ init do end
 end
 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
@@ -21685,18 +21684,18 @@ init do end
 end
 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
                                        )
@@ -21707,18 +21706,18 @@ init do end
 end
 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
                                        )
@@ -21729,12 +21728,12 @@ init do end
 end
 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
@@ -21742,18 +21741,18 @@ init do end
 end
 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
                                        )
@@ -21764,18 +21763,18 @@ init do end
 end
 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
                                        )
@@ -21786,18 +21785,18 @@ init do end
 end
 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
                                        )
@@ -21808,12 +21807,12 @@ init do end
 end
 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
@@ -21821,17 +21820,17 @@ init do end
 end
 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
                                        )
@@ -21842,17 +21841,17 @@ init do end
 end
 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
                                        )
@@ -21863,12 +21862,12 @@ init do end
 end
 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
@@ -21876,28 +21875,28 @@ init do end
 end
 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,
@@ -21910,21 +21909,21 @@ init do end
 end
 private class ReduceAction628
 special 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 TKwisset
+                                       assert tkwissetnode2 isa nullable TKwisset
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tattridnode4 = nodearraylist5
-                                       assert tattridnode4 isa TAttrid
-                                       var pexprnode1 = new AIssetAttrExpr.init_aissetattrexpr(
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
                                                tkwissetnode2,
                                                pexprnode3,
                                                tattridnode4
@@ -21936,18 +21935,18 @@ init do end
 end
 private class ReduceAction629
 special 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 tkwissetnode2 = nodearraylist1
-                                       assert tkwissetnode2 isa TKwisset
-                                       var pexprnode3 = new AImplicitSelfExpr.init_aimplicitselfexpr(
+                                       assert tkwissetnode2 isa nullable TKwisset
+                                       var pexprnode3: nullable AImplicitSelfExpr = new AImplicitSelfExpr.init_aimplicitselfexpr(
                                        )
                                        var tattridnode4 = nodearraylist2
-                                       assert tattridnode4 isa TAttrid
-                                       var pexprnode1 = new AIssetAttrExpr.init_aissetattrexpr(
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
                                                tkwissetnode2,
                                                pexprnode3,
                                                tattridnode4
@@ -21959,18 +21958,18 @@ 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
                                        )
@@ -21981,15 +21980,15 @@ init do end
 end
 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
                                        )
@@ -22000,9 +21999,9 @@ init do end
 end
 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
@@ -22011,19 +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,
@@ -22036,27 +22035,27 @@ init do end
 end
 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,
@@ -22069,24 +22068,24 @@ init do end
 end
 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
@@ -22098,27 +22097,27 @@ init do end
 end
 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
@@ -22130,9 +22129,9 @@ init do end
 end
 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
@@ -22140,19 +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
@@ -22164,26 +22163,26 @@ init do end
 end
 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
@@ -22195,9 +22194,9 @@ init do end
 end
 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
@@ -22207,21 +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,
@@ -22234,13 +22233,13 @@ init do end
 end
 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
@@ -22250,13 +22249,13 @@ init do end
 end
 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
@@ -22266,13 +22265,13 @@ init do end
 end
 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
@@ -22282,13 +22281,13 @@ init do end
 end
 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
@@ -22298,13 +22297,13 @@ init do end
 end
 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
@@ -22314,13 +22313,13 @@ init do end
 end
 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
@@ -22330,13 +22329,13 @@ init do end
 end
 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
@@ -22346,13 +22345,13 @@ init do end
 end
 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
@@ -22362,12 +22361,12 @@ init do end
 end
 private class ReduceAction647
 special 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(105), node_list)
        end
@@ -22375,9 +22374,9 @@ 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
@@ -22389,12 +22388,12 @@ 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
@@ -22406,9 +22405,9 @@ init do end
 end
 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
@@ -22422,14 +22421,14 @@ 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 tkwnotnode4 = nodearraylist8
-                                       assert tkwnotnode4 isa TKwnot
+                                       assert tkwnotnode4 isa nullable TKwnot
                                        var tkwnullnode5 = nodearraylist10
-                                       assert tkwnullnode5 isa TKwnull
-                                       var pexprnode1 = new AAsNotnullExpr.init_aasnotnullexpr(
+                                       assert tkwnullnode5 isa nullable TKwnull
+                                       var pexprnode1: nullable AAsNotnullExpr = new AAsNotnullExpr.init_aasnotnullexpr(
                                                pexprnode2,
                                                tkwasnode3,
                                                tkwnotnode4,
@@ -22442,12 +22441,12 @@ init do end
 end
 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
@@ -22455,9 +22454,9 @@ init do end
 end
 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
@@ -22467,28 +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,
@@ -22501,37 +22500,37 @@ init do end
 end
 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,
@@ -22544,12 +22543,12 @@ init do end
 end
 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
@@ -22557,9 +22556,9 @@ init do end
 end
 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
@@ -22572,18 +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,
@@ -22598,12 +22597,12 @@ init do end
 end
 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
@@ -22611,18 +22610,18 @@ init do end
 end
 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
                                        )
@@ -22633,18 +22632,18 @@ init do end
 end
 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
                                        )
@@ -22655,12 +22654,12 @@ init do end
 end
 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
@@ -22668,17 +22667,17 @@ init do end
 end
 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
                                        )
@@ -22689,12 +22688,12 @@ init do end
 end
 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
@@ -22702,18 +22701,18 @@ init do end
 end
 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
                                        )
@@ -22724,18 +22723,18 @@ init do end
 end
 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
                                        )
@@ -22746,18 +22745,18 @@ init do end
 end
 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
                                        )
@@ -22768,18 +22767,18 @@ init do end
 end
 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
                                        )
@@ -22790,18 +22789,18 @@ init do end
 end
 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
                                        )
@@ -22812,18 +22811,18 @@ init do end
 end
 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
                                        )
@@ -22834,18 +22833,18 @@ init do end
 end
 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
                                        )
@@ -22856,18 +22855,18 @@ init do end
 end
 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
                                        )
@@ -22878,18 +22877,18 @@ init do end
 end
 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
                                        )
@@ -22900,12 +22899,12 @@ init do end
 end
 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
@@ -22913,18 +22912,18 @@ init do end
 end
 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
                                        )
@@ -22935,18 +22934,18 @@ init do end
 end
 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
                                        )
@@ -22957,12 +22956,12 @@ init do end
 end
 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
@@ -22970,18 +22969,18 @@ init do end
 end
 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
                                        )
@@ -22992,18 +22991,18 @@ init do end
 end
 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
                                        )
@@ -23014,18 +23013,18 @@ init do end
 end
 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
                                        )
@@ -23036,12 +23035,12 @@ init do end
 end
 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
@@ -23049,17 +23048,17 @@ init do end
 end
 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
                                        )
@@ -23070,17 +23069,17 @@ init do end
 end
 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
                                        )
@@ -23091,12 +23090,12 @@ init do end
 end
 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
@@ -23104,28 +23103,28 @@ init do end
 end
 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,
@@ -23138,19 +23137,19 @@ init do end
 end
 private class ReduceAction682
 special 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 tkwissetnode2 = nodearraylist1
-                                       assert tkwissetnode2 isa TKwisset
+                                       assert tkwissetnode2 isa nullable TKwisset
                                        var pexprnode3 = nodearraylist2
-                                       assert pexprnode3 isa PExpr
+                                       assert pexprnode3 isa nullable PExpr
                                        var tattridnode4 = nodearraylist3
-                                       assert tattridnode4 isa TAttrid
-                                       var pexprnode1 = new AIssetAttrExpr.init_aissetattrexpr(
+                                       assert tattridnode4 isa nullable TAttrid
+                                       var pexprnode1: nullable AIssetAttrExpr = new AIssetAttrExpr.init_aissetattrexpr(
                                                tkwissetnode2,
                                                pexprnode3,
                                                tattridnode4
@@ -23162,16 +23161,16 @@ 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
                                        )
@@ -23182,28 +23181,28 @@ init do end
 end
 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,
@@ -23216,24 +23215,24 @@ init do end
 end
 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
@@ -23245,27 +23244,27 @@ init do end
 end
 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
@@ -23277,27 +23276,27 @@ init do end
 end
 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
@@ -23309,9 +23308,9 @@ init do end
 end
 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
@@ -23321,21 +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,
@@ -23348,13 +23347,13 @@ init do end
 end
 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
@@ -23364,13 +23363,13 @@ init do end
 end
 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
@@ -23380,13 +23379,13 @@ init do end
 end
 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
@@ -23396,13 +23395,13 @@ init do end
 end
 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
@@ -23412,13 +23411,13 @@ init do end
 end
 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
@@ -23428,13 +23427,13 @@ init do end
 end
 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
@@ -23444,13 +23443,13 @@ init do end
 end
 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
@@ -23460,13 +23459,13 @@ init do end
 end
 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
@@ -23476,12 +23475,12 @@ init do end
 end
 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
@@ -23489,9 +23488,9 @@ init do end
 end
 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
@@ -23503,12 +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
@@ -23520,9 +23519,9 @@ init do end
 end
 private class ReduceAction699
 special 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
@@ -23536,14 +23535,14 @@ 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 tkwnotnode4 = nodearraylist8
-                                       assert tkwnotnode4 isa TKwnot
+                                       assert tkwnotnode4 isa nullable TKwnot
                                        var tkwnullnode5 = nodearraylist10
-                                       assert tkwnullnode5 isa TKwnull
-                                       var pexprnode1 = new AAsNotnullExpr.init_aasnotnullexpr(
+                                       assert tkwnullnode5 isa nullable TKwnull
+                                       var pexprnode1: nullable AAsNotnullExpr = new AAsNotnullExpr.init_aasnotnullexpr(
                                                pexprnode2,
                                                tkwasnode3,
                                                tkwnotnode4,
@@ -23556,14 +23555,14 @@ 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
@@ -23571,10 +23570,10 @@ init do end
 end
 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)
@@ -23583,12 +23582,12 @@ init do end
 end
 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
@@ -23596,9 +23595,9 @@ init do end
 end
 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
@@ -23608,28 +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,
@@ -23642,37 +23641,37 @@ init do end
 end
 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,
@@ -23685,12 +23684,12 @@ init do end
 end
 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
@@ -23698,9 +23697,9 @@ init do end
 end
 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
@@ -23710,28 +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,
@@ -23744,37 +23743,37 @@ init do end
 end
 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,
@@ -23787,13 +23786,13 @@ init do end
 end
 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
@@ -23804,23 +23803,23 @@ init do end
 end
 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
@@ -23831,13 +23830,13 @@ init do end
 end
 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
@@ -23848,23 +23847,23 @@ init do end
 end
 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
@@ -23875,13 +23874,13 @@ init do end
 end
 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
@@ -23892,23 +23891,23 @@ init do end
 end
 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
@@ -23919,13 +23918,13 @@ init do end
 end
 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
@@ -23936,23 +23935,23 @@ init do end
 end
 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
@@ -23963,13 +23962,13 @@ init do end
 end
 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
@@ -23980,23 +23979,23 @@ init do end
 end
 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
@@ -24007,13 +24006,13 @@ init do end
 end
 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
@@ -24024,23 +24023,23 @@ init do end
 end
 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
@@ -24051,13 +24050,13 @@ init do end
 end
 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
@@ -24068,23 +24067,23 @@ init do end
 end
 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
@@ -24095,13 +24094,13 @@ init do end
 end
 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
@@ -24112,23 +24111,23 @@ init do end
 end
 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
@@ -24139,13 +24138,13 @@ init do end
 end
 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
@@ -24156,23 +24155,23 @@ init do end
 end
 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
@@ -24183,20 +24182,20 @@ init do end
 end
 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
@@ -24204,30 +24203,30 @@ init do end
 end
 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
@@ -24235,13 +24234,13 @@ init do end
 end
 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
@@ -24252,23 +24251,23 @@ init do end
 end
 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
@@ -24279,13 +24278,13 @@ init do end
 end
 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
@@ -24296,23 +24295,23 @@ init do end
 end
 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
@@ -24323,13 +24322,13 @@ init do end
 end
 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
@@ -24340,23 +24339,23 @@ init do end
 end
 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
@@ -24367,13 +24366,13 @@ init do end
 end
 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
@@ -24384,23 +24383,23 @@ init do end
 end
 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
@@ -24411,13 +24410,13 @@ init do end
 end
 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
@@ -24428,23 +24427,23 @@ init do end
 end
 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