[issue41295] CPython 3.8.4 regression on __setattr__ in multiinheritance with metaclasses

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

The error message is coming from hackcheck function in Objects/typeobject.c, https://github.com/python/cpython/blob/b4cd77de05e5bbaa6a4be90f710b787e0790c36f/Objects/typeobject.c#L5811-L5845 . The issue could be related to bpo-39960. Checking now...

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nosy: +christian.heimes

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41295>
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