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### What it does
Checks for usages of `Mutex<X>` where an atomic will do.
### Why is this bad?
Using a mutex just to make access to a plain bool or
reference sequential is shooting flies with cannons.
`std::sync::atomic::AtomicBool` and `std::sync::atomic::AtomicPtr` are 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(&y);
```
Use instead:
```
let x = AtomicBool::new(y);
```
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