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Auto merge of rust-lang#16652 - davidbarsky:david/deadlock-fix-for-16…
…643, r=Veykril internal: fix deadlock introduced by rust-lang#16643 This fixes a deadlock introduced by rust-lang#16643 ([backtrace](https://gist.github.com/davidbarsky/00f17598f5496a9c41aff31fec1c42d6)). `maybe_changed_after` calls back into other queries, so the cloning here is unfortunately inevitable. (Zulip conversation: https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer/topic/Fixing.20proc-macro.20dirtying.20with.20unindexed.20projects)
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