1use smol::future::FutureExt;
 2use std::{future::Future, time::Duration};
 3
 4pub fn post_inc(value: &mut usize) -> usize {
 5    let prev = *value;
 6    *value += 1;
 7    prev
 8}
 9
10pub async fn timeout<F, T>(timeout: Duration, f: F) -> Result<T, ()>
11where
12    F: Future<Output = T>,
13{
14    let timer = async {
15        smol::Timer::after(timeout).await;
16        Err(())
17    };
18    let future = async move { Ok(f.await) };
19    timer.race(future).await
20}
21
22#[cfg(any(test, feature = "test-support"))]
23pub struct CwdBacktrace<'a>(pub &'a backtrace::Backtrace);
24
25#[cfg(any(test, feature = "test-support"))]
26impl<'a> std::fmt::Debug for CwdBacktrace<'a> {
27    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
28        use backtrace::{BacktraceFmt, BytesOrWideString};
29
30        let cwd = std::env::current_dir().unwrap();
31        let cwd = cwd.parent().unwrap();
32        let mut print_path = |fmt: &mut std::fmt::Formatter<'_>, path: BytesOrWideString<'_>| {
33            std::fmt::Display::fmt(&path, fmt)
34        };
35        let mut fmt = BacktraceFmt::new(f, backtrace::PrintFmt::Full, &mut print_path);
36        for frame in self.0.frames() {
37            let mut formatted_frame = fmt.frame();
38            if frame
39                .symbols()
40                .iter()
41                .any(|s| s.filename().map_or(false, |f| f.starts_with(&cwd)))
42            {
43                formatted_frame.backtrace_frame(frame)?;
44            }
45        }
46        fmt.finish()
47    }
48}