Ignore broken pipe error when sending test input

This fixes a "Broken pipe (os error 32)" error during tests, which
occurs when the solution exits or is killed by timeout before the entire
input is sent.

src/repo.rs

@@ -484,7 +484,13 @@ impl Program<'_> {
  let mut child = cmd.spawn()?;
  let mut stdin = child.stdin.take().unwrap();
  // This thread copies the input data to the process's stdin.
- let in_thread = thread::spawn(move || stdin.write_all(&input));
+ let in_thread = thread::spawn(move || {
+ match stdin.write_all(&input) {
+ Ok(()) => Ok(()),
+ Err(ref e) if e.kind() == ErrorKind::BrokenPipe => Ok(()),
+ Err(e) => Err(e),
+ }
+ });
  let mut stdout = child.stdout.take().unwrap();
  let (send, recv) = mpsc::channel();
  // This thread reads the output from the child process.