// 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 foo(&self); } fn main() { let x: &dyn Foo = todo!(); //~^ ERROR the trait `Foo` cannot be made into an object }