[issue32932] better error message when __all__ contains non-str objects

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Added import experts since this issue can be not so trivial as looked at first glance.

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nosy: +brett.cannon, eric.snow, ncoghlan

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32932>
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