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warning: unused coroutine that must be used
--> $DIR/yield-in-args-rev.rs:13:5
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LL | / || {
LL | | let b = true;
LL | | foo(yield, &b);
LL | | };
| |_____^
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= note: coroutines are lazy and do nothing unless resumed
= note: `#[warn(unused_must_use)]` on by default
warning: 1 warning emitted
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