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[3.12] gh-108295: Fix crashes with TypeVar weakrefs (GH-108517) (#108527)

gh-108295: Fix crashes with TypeVar weakrefs (GH-108517)
(cherry picked from commit 482fad7f01567447b7259ebf58d62999fcdc5964)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
M
Miss Islington (bot) committed
09877a15d5a84bc1e6894cac022f18a39c67e917
Parent: 3e20303
Committed by GitHub <noreply@github.com> on 8/27/2023, 2:12:57 PM