diff options
| -rw-r--r-- | scoped_nodes.py | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/scoped_nodes.py b/scoped_nodes.py index 5f7f39b..eb60298 100644 --- a/scoped_nodes.py +++ b/scoped_nodes.py @@ -756,15 +756,21 @@ def _rec_get_names(args, names=None): # Class ###################################################################### -def _is_metaclass(klass): +def _is_metaclass(klass, seen=None): """ Return if the given class can be used as a metaclass. """ if klass.name == 'type': return True + if seen is None: + seen = set() for base in klass.bases: try: for baseobj in base.infer(): + if baseobj in seen: + continue + else: + seen.add(baseobj) if isinstance(baseobj, Instance): # not abstract return False @@ -776,7 +782,7 @@ def _is_metaclass(klass): continue if baseobj._type == 'metaclass': return True - if _is_metaclass(baseobj): + if _is_metaclass(baseobj, seen): return True except InferenceError: continue |