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### What it does
Checks for `ref` bindings which create a reference to a reference.
### Why is this bad?
The address-of operator at the use site is clearer about the need for a reference.
### Example
```
let x = Some("");
if let Some(ref x) = x {
// use `x` here
}
```
Use instead:
```
let x = Some("");
if let Some(x) = x {
// use `&x` here
}
```
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