rust/tests/ui/async-await/in-trait/object-safety.rs

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