rust/tests/ui/coroutine/clone-rpit.rs

20 lines
692 B
Rust

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