// edition:2021 #![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 MyTrait { async fn foo<'a>(&self); async fn bar(&self); } impl MyTrait for i32 { async fn foo(&self) {} //~^ ERROR lifetime parameters or bounds on method `foo` do not match the trait declaration async fn bar(&self) { self.foo(); } } fn main() {}