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### What it does
Checks for `match` with identical arm bodies.
### Why is this bad?
This is probably a copy & paste error. If arm bodies
are the same on purpose, you can factor them
[using `|`](https://doc.rust-lang.org/book/patterns.html#multiple-patterns).
### Known problems
False positive possible with order dependent `match`
(see issue
[#860](https://github.com/rust-lang/rust-clippy/issues/860)).
### Example
```
match foo {
Bar => bar(),
Quz => quz(),
Baz => bar(), // <= oops
}
```
This should probably be
```
match foo {
Bar => bar(),
Quz => quz(),
Baz => baz(), // <= fixed
}
```
or if the original code was not a typo:
```
match foo {
Bar | Baz => bar(), // <= shows the intent better
Quz => quz(),
}
```
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