1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
// compile-flags: -Z mir-opt-level=3 // edition:2018 // build-pass #![feature(async_closure)] use std::future::Future; fn async_closure() -> impl Future<Output = u8> { (async move || -> u8 { 42 })() } fn main() { let _fut = async_closure(); }