[issue21627] Concurrently closing files and iterating over the open files directory is not well specified

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +gregory.p.smith
versions: +Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21627>
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