simplified.diff

diff --git a/mypy/semanal.py b/mypy/semanal.py
index 7bac809..33d798f 100644
--- a/mypy/semanal.py
+++ b/mypy/semanal.py
@@ -2943,21 +2943,9 @@ class SemanticAnalyzer(NodeVisitor):
             if isinstance(base.node, TypeInfo):
                 # C.bar where C is a class
                 type_info = base.node
-            elif isinstance(base.node, Var) and self.function_stack:
-                # check for self.bar or cls.bar in method/classmethod
-                func = self.function_stack[-1].type
-                if isinstance(func, CallableType):
-                    formal_arg = func.argument_by_name(base.node.name())
-                    if formal_arg and formal_arg.pos == 0:
-                        if (
-                                isinstance(formal_arg.typ, CallableType) and
-                                isinstance(formal_arg.typ.ret_type, Instance)
-                        ):
-                            # classmethod
-                            type_info = formal_arg.typ.ret_type.type
-                        elif isinstance(formal_arg.typ, Instance):
-                            # instance method
-                            type_info = formal_arg.typ.type
+            elif isinstance(base.node, Var) and self.type:
+                # self.bar or cls.bar in method/classmethod
+                type_info = self.type
             if type_info:
                 n = type_info.names.get(expr.name)
                 if n is not None and (n.kind == MODULE_REF or isinstance(n.node, TypeInfo)):
diff --git a/test-data/unit/check-modules.test b/test-data/unit/check-modules.test
index a139450..2822364 100644
--- a/test-data/unit/check-modules.test
+++ b/test-data/unit/check-modules.test
@@ -1423,6 +1423,9 @@ class C:
     def foo(self) -> None:
         x = self.m.a
         reveal_type(x)  # E: Revealed type is 'builtins.str'
+        y = 'hello'
+        z = y.m.a  # E: "str" has no attribute "m"
+        reveal_type(z)
     @classmethod
     def cmethod(cls) -> None:
         y = cls.m.a