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### What it does
Checks for loops on `x.iter()` where `&x` will do, and
suggests the latter.
### Why is this bad?
Readability.
### Known problems
False negatives. We currently only warn on some known
types.
### Example
```
// with `y` a `Vec` or slice:
for x in y.iter() {
// ..
}
```
Use instead:
```
for x in &y {
// ..
}
```
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