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

### What it does
Checks for a `#[must_use]` attribute without
further information on functions and methods that return a type already
marked as `#[must_use]`.

### Why is this bad?
The attribute isn't needed. Not using the result
will already be reported. Alternatively, one can add some text to the
attribute to improve the lint message.

### Examples
```
#[must_use]
fn double_must_use() -> Result<(), ()> {
    unimplemented!();
}
```
Commit	Line	Data
f2b60f7d FG	1	### What it does
	2	Checks for a `#[must_use]` attribute without
	3	further information on functions and methods that return a type already
	4	marked as `#[must_use]`.
	5
	6	### Why is this bad?
	7	The attribute isn't needed. Not using the result
	8	will already be reported. Alternatively, one can add some text to the
	9	attribute to improve the lint message.
	10
	11	### Examples
	12	```
	13	#[must_use]
	14	fn double_must_use() -> Result<(), ()> {
	15	unimplemented!();
	16	}
	17	```