[issue39421] Use-after-free in heappushpop() of heapq module

[Dong-hee Na]

Change by Dong-hee Na <donghee.na92 at gmail.com>:


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stage:  -> needs patch
versions:  -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39421>
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