tests/run-make/coverage/closure_macro_async.rs

   1 // compile-flags: --edition=2018
   2 #![feature(no_coverage)]
   3
   4 macro_rules! bail {
   5     ($msg:literal $(,)?) => {
   6         if $msg.len() > 0 {
   7             println!("no msg");
   8         } else {
   9             println!($msg);
  10         }
  11         return Err(String::from($msg));
  12     };
  13 }
  14
  15 macro_rules! on_error {
  16     ($value:expr, $error_message:expr) => {
  17         $value.or_else(|e| { // FIXME(85000): no coverage in closure macros
  18             let message = format!($error_message, e);
  19             if message.len() > 0 {
  20                 println!("{}", message);
  21                 Ok(String::from("ok"))
  22             } else {
  23                 bail!("error");
  24             }
  25         })
  26     };
  27 }
  28
  29 fn load_configuration_files() -> Result<String, String> {
  30     Ok(String::from("config"))
  31 }
  32
  33 pub async fn test() -> Result<(), String> {
  34     println!("Starting service");
  35     let config = on_error!(load_configuration_files(), "Error loading configs: {}")?;
  36
  37     let startup_delay_duration = String::from("arg");
  38     let _ = (config, startup_delay_duration);
  39     Ok(())
  40 }
  41
  42 #[no_coverage]
  43 fn main() {
  44     executor::block_on(test());
  45 }
  46
  47 mod executor {
  48     use core::{
  49         future::Future,
  50         pin::Pin,
  51         task::{Context, Poll, RawWaker, RawWakerVTable, Waker},
  52     };
  53
  54     #[no_coverage]
  55     pub fn block_on<F: Future>(mut future: F) -> F::Output {
  56         let mut future = unsafe { Pin::new_unchecked(&mut future) };
  57         use std::hint::unreachable_unchecked;
  58         static VTABLE: RawWakerVTable = RawWakerVTable::new(
  59
  60             #[no_coverage]
  61             |_| unsafe { unreachable_unchecked() }, // clone
  62
  63             #[no_coverage]
  64             |_| unsafe { unreachable_unchecked() }, // wake
  65
  66             #[no_coverage]
  67             |_| unsafe { unreachable_unchecked() }, // wake_by_ref
  68
  69             #[no_coverage]
  70             |_| (),
  71         );
  72         let waker = unsafe { Waker::from_raw(RawWaker::new(core::ptr::null(), &VTABLE)) };
  73         let mut context = Context::from_waker(&waker);
  74
  75         loop {
  76             if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
  77                 break val;
  78             }
  79         }
  80     }
  81 }