message: try to pin down the travis failure
diff: @@ -73,13 +73,13 @@ fn compile_test() {
  };
  run_pass();
  let host = Path::new(&sysroot).file_name()
  - .unwrap()
  + .expect("sysroot has no last par")
  .to_str()
  - .unwrap()
  + .expect("sysroot contains non utf8")
  .splitn(2, '-')
  .skip(1)
  .next()
  - .unwrap();
  + .expect("target dir not prefixed");
  for_all_targets(&sysroot, |target| {
  miri_pass("tests/run-pass", &target, host);
  if let Ok(path) = std::env::var("MIRI_RUSTC_TEST") {
  