mirror of https://github.com/rust-lang/rust
21 lines
709 B
Rust
21 lines
709 B
Rust
//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[next] compile-flags: -Znext-solver
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//@[current] check-pass
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//@[next] known-bug: trait-system-refactor-initiative#82
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#![feature(coroutines, coroutine_trait, coroutine_clone)]
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// This stalls the goal `{coroutine} <: impl Clone`, since that has a nested goal
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// of `{coroutine}: Clone`. That is only known if we can compute the generator
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// witness types, which we don't know until after borrowck. When we later check
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// the goal for correctness, we want to be able to bind the `impl Clone` opaque.
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pub fn foo<'a, 'b>() -> impl Clone {
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#[coroutine]
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move |_: ()| {
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let () = yield ();
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}
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}
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fn main() {}
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