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

error: calling `&mut Mutex::lock` unnecessarily locks an exclusive (mutable) reference
  --> tests/ui/mut_mutex_lock.rs:15:43
   |
LL |     let mut value = mut_ref_mut_ref_mutex.lock().unwrap();
   |                                           ^^^^ help: change this to: `get_mut`

error: aborting due to 2 previous errors