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error: calling `&mut Mutex::lock` unnecessarily locks an exclusive (mutable) reference
--> $DIR/mut_mutex_lock.rs:10:33
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LL | let mut value = value_mutex.lock().unwrap();
| ^^^^ help: change this to: `get_mut`
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= note: `-D clippy::mut-mutex-lock` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::mut_mutex_lock)]`
error: aborting due to 1 previous error
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