// run-rustfix // edition:2018 #![feature(async_closure)] #![warn(clippy::async_yields_async)] use core::future::Future; use core::pin::Pin; use core::task::{Context, Poll}; struct CustomFutureType; impl Future for CustomFutureType { type Output = u8; fn poll(self: Pin<&mut Self>, _: &mut Context) -> Poll<Self::Output> { Poll::Ready(3) } } fn custom_future_type_ctor() -> CustomFutureType { CustomFutureType } async fn f() -> CustomFutureType { // Don't warn for functions since you have to explicitly declare their // return types. CustomFutureType } #[rustfmt::skip] fn main() { let _f = { 3 }; let _g = async { 3 }; let _h = async { async { 3 }.await }; let _i = async { CustomFutureType.await }; let _i = async || { 3 }; let _j = async || { async { 3 }.await }; let _k = async || { CustomFutureType.await }; let _l = async || CustomFutureType.await; let _m = async || { println!("I'm bored"); // Some more stuff // Finally something to await CustomFutureType.await }; let _n = async || custom_future_type_ctor(); let _o = async || f(); }