[issue31315] assertion failure in imp.create_dynamic(), when spec.name is not a string

[Serhiy Storchaka]

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


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stage:  -> patch review
versions: +Python 2.7, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31315>
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