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While debugging #30536 I happened to notice that the bug only reproduced
when there was interleaving scopes, and observed that an unpruned scope
nested inside of a pruned one was not being visited by
CollectPromotableTemporaries, which keeps track of which identifiers
should be promoted later. Therefore when actually promoting temporaries
we were skipping over the identifiers in children of pruned scopes
ghstack-source-id: d805f62f22
Pull Request resolved: https://github.com/facebook/react/pull/30537