mirror of https://github.com/rust-lang/rust
66 lines
1.6 KiB
Rust
66 lines
1.6 KiB
Rust
#![feature(coverage_attribute)]
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#![feature(noop_waker)]
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//@ edition: 2018
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macro_rules! bail {
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($msg:literal $(,)?) => {
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if $msg.len() > 0 {
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println!("no msg");
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} else {
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println!($msg);
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}
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return Err(String::from($msg));
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};
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}
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macro_rules! on_error {
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($value:expr, $error_message:expr) => {
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$value.or_else(|e| {
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// This closure, which is declared in a macro, should be instrumented.
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let message = format!($error_message, e);
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if message.len() > 0 {
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println!("{}", message);
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Ok(String::from("ok"))
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} else {
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bail!("error");
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}
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})
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};
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}
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fn load_configuration_files() -> Result<String, String> {
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Ok(String::from("config"))
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}
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pub async fn test() -> Result<(), String> {
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println!("Starting service");
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let config = on_error!(load_configuration_files(), "Error loading configs: {}")?;
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let startup_delay_duration = String::from("arg");
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let _ = (config, startup_delay_duration);
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Ok(())
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}
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#[coverage(off)]
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fn main() {
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executor::block_on(test()).unwrap();
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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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