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| |} | |