message: change sysroot check to print the output in case of an error
diff: @@ -133,11 +133,12 @@ fn test_sysroot_consistency() {
  fn get_sysroot(mut cmd: Command) -> PathBuf {
  let out = cmd.arg("--print").arg("sysroot")
  .output().expect("Failed to run rustc to get sysroot info");
  - assert!(out.status.success(), "Bad status code when getting sysroot info");
  - let sysroot = out.stdout.lines().nth(0)
  - .expect("didn't get at least one line for the sysroot").unwrap();
  - PathBuf::from(sysroot).canonicalize()
  - .expect("Failed to canonicalize sysroot")
  + let stdout = String::from_utf8(out.stdout).expect("stdout is not valid UTF-8");
  + let stderr = String::from_utf8(out.stderr).expect("stderr is not valid UTF-8");
  + let stdout = stdout.trim();
  + assert!(out.status.success(), "Bad status code when getting sysroot info.\nstdout:\n{}\nstderr:\n{}", stdout, stderr);
  + PathBuf::from(stdout).canonicalize()
  + .unwrap_or_else(|_| panic!("Failed to canonicalize sysroot: {}", stdout))
  }
  let rustc_sysroot = get_sysroot(Command::new("rustc"));
  