The changes for code execution registered the

scope-entry as a variable. This means that
analyse_attribute expects to find a pointer to
a member of the c-object struct.
This is not the case for members, so we need a
special case.

Cython/Compiler/ExprNodes.py

@@ -1684,6 +1684,9 @@ class AttributeNode(ExprNode):
             if entry:
                 if obj_type.is_extension_type and entry.name == "__weakref__":
                     error(self.pos, "Illegal use of special attribute __weakref__")
+                # methods need the normal attribute lookup
+                # because they do not have struct entries
+                if not entry.is_method:
                     if entry.is_variable or entry.is_cmethod:
                         self.type = entry.type
                         self.member = entry.cname