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☔ The latest upstream changes (presumably #164230) made this pull request unmergeable. Please resolve the merge conflicts by rebasing. |
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Tracking issue: #134645
RwLockReadGuardneeds to be invariant overTto make read-guard-upgrading sound. In the unlikely case that users need covariance (because they pass the guard around instead of references to the data), they can useMappedRwLockReadGuard, which remains covariant.