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

warning: unused generator that must be used
  --> $DIR/yield-in-initializer.rs:6:5
   |
LL | /     static || {
LL | |         loop {
LL | |             // Test that `opt` is not live across the yield, even when borrowed in a loop
LL | |             // See https://github.com/rust-lang/rust/issues/52792
...  |
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: \|\| {}; } ``` 2020-07-28 00:00:00 +00:00			`warning: unused generator that must be used`
			`--> $DIR/yield-in-initializer.rs:6:5`
			`\|`
			`LL \| / static \|\| {`
			`LL \| \| loop {`
			LL \| \| // Test that `opt` is not live across the yield, even when borrowed in a loop
			`LL \| \| // See https://github.com/rust-lang/rust/issues/52792`
			`... \|`
			`LL \| \| }`
			`LL \| \| };`
			`\| \|______^`
			`\|`
			= note: `#[warn(unused_must_use)]` on by default
			`= note: generators are lazy and do nothing unless resumed`

			`warning: 1 warning emitted`