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// compile-flags: -Znext-solver
// edition: 2021
// revisions: pass fail
//[pass] check-pass
#![feature(coroutine_trait, coroutines)]
use std::ops::Coroutine;
struct A;
struct B;
struct C;
fn needs_coroutine(_: impl Coroutine<A, Yield = B, Return = C>) {}
#[cfg(fail)]
fn main() {
needs_coroutine(|| {
//[fail]~^ ERROR Coroutine<A>` is not satisfied
//[fail]~| ERROR as Coroutine<A>>::Yield == B`
//[fail]~| ERROR as Coroutine<A>>::Return == C`
yield ();
});
}
#[cfg(pass)]
fn main() {
needs_coroutine(|_: A| {
let _: A = yield B;
C
})
}
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