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

### What it does
Checks for calls to `std::mem::drop` with a value
that derives the Copy trait

### Why is this bad?
Calling `std::mem::drop` [does nothing for types that
implement Copy](https://doc.rust-lang.org/std/mem/fn.drop.html), since the
value will be copied and moved into the function on invocation.

### Example
```
let x: i32 = 42; // i32 implements Copy
std::mem::drop(x) // A copy of x is passed to the function, leaving the
                  // original unaffected
```
Commit	Line	Data
f2b60f7d FG	1	### What it does
	2	Checks for calls to `std::mem::drop` with a value
	3	that derives the Copy trait
	4
	5	### Why is this bad?
	6	Calling `std::mem::drop` [does nothing for types that
	7	implement Copy](https://doc.rust-lang.org/std/mem/fn.drop.html), since the
	8	value will be copied and moved into the function on invocation.
	9
	10	### Example
	11	```
	12	let x: i32 = 42; // i32 implements Copy
	13	std::mem::drop(x) // A copy of x is passed to the function, leaving the
	14	// original unaffected
	15	```