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[3.10] bpo-44589: raise a SyntaxError when mapping patterns have duplicate literal keys (GH-27131) (GH-27157)

(cherry picked from commit 2693132292b2acf381ac6fa729bf3acf41d9d72b)


Co-authored-by: Jack DeVries <58614260+jdevries3133@users.noreply.github.com>

Automerge-Triggered-By: GH:brandtbucher
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Miss Islington (bot) committed
016af14d93cfba43e7a95721a97fa954c534af8e
Parent: ff7af22
Committed by GitHub <noreply@github.com> on 7/15/2021, 1:00:35 AM