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### What it does
Checks methods that contain a `self` argument but don't use it
### Why is this bad?
It may be clearer to define the method as an associated function instead
of an instance method if it doesn't require `self`.
### Example
```
struct A;
impl A {
fn method(&self) {}
}
```
Could be written:
```
struct A;
impl A {
fn method() {}
}
```
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