//@ edition:2018 struct S; impl S { fn very_long_method_name_the_longest_method_name_in_the_whole_universe(self) {} } async fn foo() { S.very_long_method_name_the_longest_method_name_in_the_whole_universe() .await //~^ error: `()` is not a future //~| help: remove the `.await` //~| help: the trait `Future` is not implemented for `()` } fn main() {}