[issue22668] memoryview.format is corrupted due to dangling shared pointer

[Berker Peksag]

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


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stage:  -> patch review
versions:  -Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22668>
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