rust/src/test/ui/generator/yield-in-box.stderr

warning: unused generator that must be used
  --> $DIR/yield-in-box.rs:9:5
   |
LL | /     || {
LL | |         let y = 2u32;
LL | |         {
LL | |             let _t = box (&x, yield 0, &y);
...  |
LL | |         }
LL | |     };
   | |______^
   |
   = note: `#[warn(unused_must_use)]` on by default
   = note: generators are lazy and do nothing unless resumed

warning: 1 warning emitted
Make closures and generators a must use types Warn about unused expressions with closure or generator type. This follows existing precedence of must use annotations present on `FnOnce`, `FnMut`, `Fn` traits, which already indirectly apply to closures in some cases, e.g.,: ```rust fn f() -> impl FnOnce() { \|\| {} } fn main() { // an existing warning: unused implementer of `std::ops::FnOnce` that must be used: f(); // a new warning: unused closure that must be used: \|\| {}; } ``` 2020-07-27 19:00:00 -05:00			`warning: unused generator that must be used`
			`--> $DIR/yield-in-box.rs:9:5`
			`\|`
			`LL \| / \|\| {`
			`LL \| \| let y = 2u32;`
			`LL \| \| {`
			`LL \| \| let _t = box (&x, yield 0, &y);`
			`... \|`
			`LL \| \| }`
			`LL \| \| };`
			`\| \|______^`
			`\|`
			= note: `#[warn(unused_must_use)]` on by default
			`= note: generators are lazy and do nothing unless resumed`

			`warning: 1 warning emitted`