// edition:2021 // [next] compile-flags: -Zlower-impl-trait-in-trait-to-assoc-ty // revisions: current next #![feature(async_fn_in_trait)] //~^ WARN the feature `async_fn_in_trait` is incomplete and may not be safe to use and/or cause compiler crashes trait Foo { async fn bar(); } async fn test() { T::bar().await; } fn test2() { assert_is_send(test::()); //~^ ERROR future cannot be sent between threads safely } fn assert_is_send(_: impl Send) {} fn main() {}