rust/tests/coverage/await_ready.coverage

   LL|       |#![feature(coverage_attribute)]
   LL|       |#![feature(custom_inner_attributes)] // for #![rustfmt::skip]
   LL|       |#![feature(noop_waker)]
   LL|       |#![rustfmt::skip]
   LL|       |//@ edition: 2021
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |async fn ready() -> u8 { 1 }
   LL|       |
   LL|      1|async fn await_ready() -> u8 {
   LL|      1|    // await should be covered even if the function never yields
   LL|      1|    ready()
   LL|      1|        .await
   LL|      1|}
   LL|       |
   LL|      1|fn main() {
   LL|      1|    let mut future = Box::pin(await_ready());
   LL|      1|    executor::block_on(future.as_mut());
   LL|      1|}
   LL|       |
   LL|       |mod executor {
   LL|       |    use core::future::Future;
   LL|       |    use core::pin::pin;
   LL|       |    use core::task::{Context, Poll, Waker};
   LL|       |
   LL|       |    #[coverage(off)]
   LL|       |    pub fn block_on<F: Future>(mut future: F) -> F::Output {
   LL|       |        let mut future = pin!(future);
   LL|       |        let mut context = Context::from_waker(Waker::noop());
   LL|       |
   LL|       |        loop {
   LL|       |            if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
   LL|       |                break val;
   LL|       |            }
   LL|       |        }
   LL|       |    }
   LL|       |}