From the documentation [0] for Mutex<T>: For a mutex, this means that the lock and try_lock methods return a Result which indicates whether a mutex has b

From the documentation [0] for Mutex<T>: For a mutex, this means that the lock and try_lock methods return a Result which indicates whether a mutex has been poisoned or not. Most usage of a mutex will simply unwrap() these results, propagating panics among threads to ensure that a possibly invalid invariant is not witnessed. A poisoned mutex, however, does not prevent all access to the underlying data. The PoisonError type has an into_inner method which will return the guard that would have otherwise been returned on a successful lock. This allows access to the data, despite the lock being poisoned. [0] https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html