[issue33767] Improper use of SystemError in the mmap module

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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keywords: +patch
pull_requests: +7008
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33767>
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