[rustc.git] / src / tools / clippy / src / docs / unneeded_wildcard_pattern.txt

### What it does
Checks for tuple patterns with a wildcard
pattern (`_`) is next to a rest pattern (`..`).

_NOTE_: While `_, ..` means there is at least one element left, `..`
means there are 0 or more elements left. This can make a difference
when refactoring, but shouldn't result in errors in the refactored code,
since the wildcard pattern isn't used anyway.

### Why is this bad?
The wildcard pattern is unneeded as the rest pattern
can match that element as well.

### Example
```
match t {
    TupleStruct(0, .., _) => (),
    _ => (),
}
```

Use instead:
```
match t {
    TupleStruct(0, ..) => (),
    _ => (),
}
```
Commit	Line	Data
f2b60f7d FG	1	### What it does
	2	Checks for tuple patterns with a wildcard
	3	pattern (`_`) is next to a rest pattern (`..`).
	4
	5	_NOTE_: While `_, ..` means there is at least one element left, `..`
	6	means there are 0 or more elements left. This can make a difference
	7	when refactoring, but shouldn't result in errors in the refactored code,
	8	since the wildcard pattern isn't used anyway.
	9
	10	### Why is this bad?
	11	The wildcard pattern is unneeded as the rest pattern
	12	can match that element as well.
	13
	14	### Example
	15	```
	16	match t {
	17	TupleStruct(0, .., _) => (),
	18	_ => (),
	19	}
	20	```
	21
	22	Use instead:
	23	```
	24	match t {
	25	TupleStruct(0, ..) => (),
	26	_ => (),
	27	}
	28	```