1 error[E0277]: the trait bound `fn() -> impl std::future::Future {foo}: std::future::Future` is not satisfied
2 --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:9:9
4 LL | fn bar(f: impl Future<Output=()>) {}
5 | --- ----------------- required by this bound in `bar`
10 | the trait `std::future::Future` is not implemented for `fn() -> impl std::future::Future {foo}`
11 | help: use parentheses to call the function: `foo()`
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0277`.