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### What it does
Checks for bindings that shadow other bindings already in
scope, while just changing reference level or mutability.
### Why is this bad?
Not much, in fact it's a very common pattern in Rust
code. Still, some may opt to avoid it in their code base, they can set this
lint to `Warn`.
### Example
```
let x = &x;
```
Use instead:
```
let y = &x; // use different variable name
```
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