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### What it does
Detects methods named `iter` or `iter_mut` that do not have a return type that implements `Iterator`.
### Why is this bad?
Methods named `iter` or `iter_mut` conventionally return an `Iterator`.
### Example
```
// `String` does not implement `Iterator`
struct Data {}
impl Data {
fn iter(&self) -> String {
todo!()
}
}
```
Use instead:
```
use std::str::Chars;
struct Data {}
impl Data {
fn iter(&self) -> Chars<'static> {
todo!()
}
}
```
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