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### What it does
Checks for explicit `Clone` implementations for `Copy`
types.
### Why is this bad?
To avoid surprising behavior, these traits should
agree and the behavior of `Copy` cannot be overridden. In almost all
situations a `Copy` type should have a `Clone` implementation that does
nothing more than copy the object, which is what `#[derive(Copy, Clone)]`
gets you.
### Example
```
#[derive(Copy)]
struct Foo;
impl Clone for Foo {
// ..
}
```
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