[issue33623] Fix possible SIGSGV when asyncio.Future is created in __del__

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

Would be great to merge this in 3.7.0.  The change is super safe to merge.

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nosy: +ned.deily
priority: normal -> release blocker

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33623>
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