[issue28214] Improve exception reporting for problematic __set_name__ attributes

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Proposed patch makes class creation code not looking up the __set_name__ attribute in instance dict.

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keywords: +patch
stage: needs patch -> patch review
Added file: http://bugs.python.org/file44757/lookup___set_name__.patch

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