async_block.coverage

   LL|       |#![feature(coverage_attribute)]
   LL|       |#![feature(noop_waker)]
   LL|       |//@ edition: 2021
   LL|       |
   LL|      1|fn main() {
   LL|     17|    for i in 0..16 {
                      ^16
   LL|     16|        let future = async {
   LL|     16|            if i >= 12 {
   LL|      4|                println!("big");
   LL|     12|            } else {
   LL|     12|                println!("small");
   LL|     12|            }
   LL|     16|        };
   LL|     16|        executor::block_on(future);
   LL|     16|    }
   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|       |}