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### What it does
Checks for explicit self-assignments.
### Why is this bad?
Self-assignments are redundant and unlikely to be
intentional.
### Known problems
If expression contains any deref coercions or
indexing operations they are assumed not to have any side effects.
### Example
```
struct Event {
x: i32,
}
fn copy_position(a: &mut Event, b: &Event) {
a.x = a.x;
}
```
Should be:
```
struct Event {
x: i32,
}
fn copy_position(a: &mut Event, b: &Event) {
a.x = b.x;
}
```
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