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27 lines
778 B
Rust
27 lines
778 B
Rust
//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[current] check-pass
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//@[next] compile-flags: -Znext-solver
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#![feature(coroutines, coroutine_trait)]
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use std::ops::{Coroutine, CoroutineState};
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fn foo() -> impl Coroutine<Yield = (), Return = ()> {
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// FIXME(-Znext-solver): this fails with a mismatched types as the
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// hidden type of the opaque ends up as {type error}. We should not
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// emit errors for such goals.
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#[coroutine] || {
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let mut gen = Box::pin(foo());
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//[next]~^ ERROR type annotations needed
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let mut r = gen.as_mut().resume(());
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while let CoroutineState::Yielded(v) = r {
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yield v;
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r = gen.as_mut().resume(());
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}
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}
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}
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fn main() {
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foo();
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}
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