// edition:2021 // check-pass #![feature(async_fn_in_trait, return_position_impl_trait_in_trait)] #![allow(incomplete_features)] use std::fmt::Debug; trait Foo { #[allow(async_fn_in_trait)] async fn baz(&self) -> impl Debug { "" } } struct Bar; impl Foo for Bar {} fn main() { let _ = Bar.baz(); }