make it work in zope2

product/ZSQLCatalog/SQLCatalog.py

@@ -1451,7 +1451,7 @@ class Catalog(Folder,
     if meta_type in self.HAS_ARGUMENT_SRC_METATYPE_SET:
       return method.arguments_src.split()
     elif meta_type in self.HAS_FUNC_CODE_METATYPE_SET:
-      return method.__code__.co_varnames[:method.__code__.co_argcount]
+      return method.func_code.co_varnames[:method.func_code.co_argcount]
     # Note: Raising here would completely prevent indexation from working.
     # Instead, let the method actually fail when called, so _catalogObjectList
     # can log the error and carry on.