### What it does
Checks for loops on `y.into_iter()` where `y` will do, and
suggests the latter.

### Why is this bad?
Readability.

### Example
```
// with `y` a `Vec` or slice:
for x in y.into_iter() {
    // ..
}
```
can be rewritten to
```
for x in y {
    // ..
}
```