Merge: null as receiver

[nit.git] / src / semantize / typing.nit

diff --git a/src/semantize/typing.nit b/src/semantize/typing.nit
index 9d24a21..ae697d4 100644 (file)
--- a/src/semantize/typing.nit
+++ b/src/semantize/typing.nit
@@ -266,8 +266,13 @@ private class TypeVisitor
 
                #debug("recv: {recvtype} (aka {unsafe_type})")
                if recvtype isa MNullType then
-                       self.error(node, "Error: Method '{name}' call on 'null'.")
-                       return null
+                       # `null` only accepts some methods of object.
+                       if name == "==" or name == "!=" or name == "is_same_instance" then
+                               unsafe_type = mmodule.object_type.as_nullable
+                       else
+                               self.error(node, "Error: Method '{name}' call on 'null'.")
+                               return null
+                       end
                end
 
                var mproperty = self.try_get_mproperty_by_name2(node, unsafe_type, name)
@@ -756,11 +761,6 @@ redef class AReassignFormExpr
 
                self.read_type = readtype
 
-               if readtype isa MNullType then
-                       v.error(self, "Error: Method '{reassign_name}' call on 'null'.")
-                       return null
-               end
-
                var callsite = v.get_method(self, readtype, reassign_name, false)
                if callsite == null then return null # Skip error
                self.reassign_callsite = callsite
@@ -1407,10 +1407,6 @@ redef class ASendExpr
                var name = self.property_name
 
                if recvtype == null then return # Forward error
-               if recvtype isa MNullType then
-                       v.error(self, "Error: Method '{name}' call on 'null'.")
-                       return
-               end
 
                var callsite = v.get_method(self, recvtype, name, self.n_expr isa ASelfExpr)
                if callsite == null then return
@@ -1554,10 +1550,6 @@ redef class ASendReassignFormExpr
                var name = self.property_name
 
                if recvtype == null then return # Forward error
-               if recvtype isa MNullType then
-                       v.error(self, "Error: Method '{name}' call on 'null'.")
-                       return
-               end
 
                var for_self = self.n_expr isa ASelfExpr
                var callsite = v.get_method(self, recvtype, name, for_self)