[issue24099] Use after free in siftdown (1)

[Roundup Robot]

Roundup Robot added the comment:

New changeset d356e68de236 by Raymond Hettinger in branch '2.7':
Issues #24099, #24100, and #24101: Fix free-after-use bug in heapq.
https://hg.python.org/cpython/rev/d356e68de236

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<http://bugs.python.org/issue24099>
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