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### What it does
Lints for suspicious operations in impls of OpAssign, e.g.
subtracting elements in an AddAssign impl.
### Why is this bad?
This is probably a typo or copy-and-paste error and not intended.
### Example
```
impl AddAssign for Foo {
fn add_assign(&mut self, other: Foo) {
*self = *self - other;
}
}
```
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