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Currently `await` is only counted towards coverage if the containing function is suspended and resumed at least once. This is because it expands to code which contains a branch on the discriminant of `Poll`. By treating it like a branching macro (e.g. `assert!`), these implementation details will be hidden from the coverage results.
38 lines
877 B
Rust
38 lines
877 B
Rust
#![feature(coverage_attribute)]
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#![feature(custom_inner_attributes)] // for #![rustfmt::skip]
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#![feature(noop_waker)]
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#![rustfmt::skip]
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//@ edition: 2021
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#[coverage(off)]
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async fn ready() -> u8 { 1 }
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async fn await_ready() -> u8 {
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// await should be covered even if the function never yields
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ready()
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.await
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}
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fn main() {
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let mut future = Box::pin(await_ready());
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executor::block_on(future.as_mut());
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}
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mod executor {
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use core::future::Future;
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use core::pin::pin;
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use core::task::{Context, Poll, Waker};
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#[coverage(off)]
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pub fn block_on<F: Future>(mut future: F) -> F::Output {
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let mut future = pin!(future);
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let mut context = Context::from_waker(Waker::noop());
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loop {
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if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
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break val;
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}
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}
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}
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}
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