rust/tests/run-coverage/closure_macro_async.coverage

   LL|       |// compile-flags: --edition=2018
   LL|       |#![feature(coverage_attribute)]
   LL|       |
   LL|       |macro_rules! bail {
   LL|       |    ($msg:literal $(,)?) => {
   LL|       |        if $msg.len() > 0 {
   LL|       |            println!("no msg");
   LL|       |        } else {
   LL|       |            println!($msg);
   LL|       |        }
   LL|       |        return Err(String::from($msg));
   LL|       |    };
   LL|       |}
   LL|       |
   LL|       |macro_rules! on_error {
   LL|       |    ($value:expr, $error_message:expr) => {
   LL|       |        $value.or_else(|e| { // FIXME(85000): no coverage in closure macros
   LL|       |            let message = format!($error_message, e);
   LL|       |            if message.len() > 0 {
   LL|       |                println!("{}", message);
   LL|       |                Ok(String::from("ok"))
   LL|       |            } else {
   LL|       |                bail!("error");
   LL|       |            }
   LL|       |        })
   LL|       |    };
   LL|       |}
   LL|       |
   LL|      1|fn load_configuration_files() -> Result<String, String> {
   LL|      1|    Ok(String::from("config"))
   LL|      1|}
   LL|       |
   LL|      1|pub async fn test() -> Result<(), String> {
   LL|      1|    println!("Starting service");
   LL|      1|    let config = on_error!(load_configuration_files(), "Error loading configs: {}")?;
                                                                                                 ^0
   LL|       |
   LL|      1|    let startup_delay_duration = String::from("arg");
   LL|      1|    let _ = (config, startup_delay_duration);
   LL|      1|    Ok(())
   LL|      1|}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |fn main() {
   LL|       |    executor::block_on(test()).unwrap();
   LL|       |}
   LL|       |
   LL|       |mod executor {
   LL|       |    use core::{
   LL|       |        future::Future,
   LL|       |        pin::Pin,
   LL|       |        task::{Context, Poll, RawWaker, RawWakerVTable, Waker},
   LL|       |    };
   LL|       |
   LL|       |    #[coverage(off)]
   LL|       |    pub fn block_on<F: Future>(mut future: F) -> F::Output {
   LL|       |        let mut future = unsafe { Pin::new_unchecked(&mut future) };
   LL|       |        use std::hint::unreachable_unchecked;
   LL|       |        static VTABLE: RawWakerVTable = RawWakerVTable::new(
   LL|       |            #[coverage(off)]
   LL|       |            |_| unsafe { unreachable_unchecked() }, // clone
   LL|       |            #[coverage(off)]
   LL|       |            |_| unsafe { unreachable_unchecked() }, // wake
   LL|       |            #[coverage(off)]
   LL|       |            |_| unsafe { unreachable_unchecked() }, // wake_by_ref
   LL|       |            #[coverage(off)]
   LL|       |            |_| (),
   LL|       |        );
   LL|       |        let waker = unsafe { Waker::from_raw(RawWaker::new(core::ptr::null(), &VTABLE)) };
   LL|       |        let mut context = Context::from_waker(&waker);
   LL|       |
   LL|       |        loop {
   LL|       |            if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
   LL|       |                break val;
   LL|       |            }
   LL|       |        }
   LL|       |    }
   LL|       |}