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### What it does
Checks for usages of `Mutex<X>` where `X` is an integral
type.
### Why is this bad?
Using a mutex just to make access to a plain integer
sequential is
shooting flies with cannons. `std::sync::atomic::AtomicUsize` is leaner and faster.
### Known problems
This lint cannot detect if the mutex is actually used
for waiting before a critical section.
### Example
```
let x = Mutex::new(0usize);
```
Use instead:
```
let x = AtomicUsize::new(0usize);
```
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