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[3.13] gh-146613: Fix re-entrant use-after-free in `itertools._grouper` (GH-147962) (#148011)

gh-146613: Fix re-entrant use-after-free in `itertools._grouper` (GH-147962)
(cherry picked from commit fc7a188fe70a7b98696b4fcee8db9eb8398aeb7b)

Co-authored-by: Ma Yukun <68433685+TheSkyC@users.noreply.github.com>
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Miss Islington (bot) committed
7fc8507f3d5251b8a5dc84049b261d69ca02f996
Parent: 4c8d6f4
Committed by GitHub <noreply@github.com> on 4/7/2026, 10:24:54 AM