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gh-92261: Disallow iteration of Union (and other special forms) (GH-92262) (GH-92582)

(cherry picked from commit 4739997e141c4c84bd2241d4d887c3c658d92700)

Co-authored-by: Matthew Rahtz <matthew.rahtz@gmail.com>
M
Miss Islington (bot) committed
7540a432cedf478d03da1254c470ac552f397916
Parent: 74c094d
Committed by GitHub <noreply@github.com> on 5/10/2022, 5:39:31 AM