[issue28214] Improve exception reporting for problematic __set_name__ attributes

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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assignee:  -> serhiy.storchaka
resolution:  -> fixed
stage: commit review -> resolved
status: open -> closed

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