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Auto merge of #41624 - RalfJung:mutexguard-sync, r=alexcrichton
MutexGuard<T> may be Sync only if T is Sync Fixes #41622 This is a breaking change. Does that imply any further process? I am not sure whether I wrote that "compilation must fail"-test correctly, but at least it is passing here with the patch applied. Same for the `since = "1.18.0"`, I just picked it because I had to pick something.
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