implement OwnedMappedMutexGuard #2858
Description
Is there any plan to add implementation for OwnedMappedMutexGuard like in tokio, https://docs.rs/tokio/latest/tokio/sync/struct.OwnedMappedMutexGuard.html
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Is there any plan to add implementation for OwnedMappedMutexGuard like in tokio, https://docs.rs/tokio/latest/tokio/sync/struct.OwnedMappedMutexGuard.html