[issue28214] Improve exception reporting for problematic __set_name__ attributes

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Maybe there is a bug in using __set_name__. Usually special methods are looked in class dict. But __set_name__ is looked in instance dict. This causes to invoking __getattr__.

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28214>
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