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### What it does
Detects `().hash(_)`.
### Why is this bad?
Hashing a unit value doesn't do anything as the implementation of `Hash` for `()` is a no-op.
### Example
```
match my_enum {
Empty => ().hash(&mut state),
WithValue(x) => x.hash(&mut state),
}
```
Use instead:
```
match my_enum {
Empty => 0_u8.hash(&mut state),
WithValue(x) => x.hash(&mut state),
}
```
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