[issue15994] memoryview to freed memory can cause segfault

[Gregory P. Smith]

Change by Gregory P. Smith <greg at krypto.org>:


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nosy: +gregory.p.smith
versions: +Python 3.7, Python 3.8 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue15994>
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