message: make HashMap test a bit nicer
diff: @@ -24,12 +24,10 @@ fn test_map<S: BuildHasher>(mut map: HashMap<i32, i32, S>) {
  }
  fn main() {
  - if cfg!(target_os = "macos") { // TODO: Implement random number generation on OS X.
  + if cfg!(target_os = "macos") { // TODO: Implement libstd HashMap seeding for macOS (https://github.com/rust-lang/miri/issues/686).
  // Until then, use a deterministic map.
  - let map : HashMap<i32, i32, BuildHasherDefault<collections::hash_map::DefaultHasher>> = HashMap::default();
  - test_map(map);
  + test_map::<BuildHasherDefault<collections::hash_map::DefaultHasher>>(HashMap::default());
  } else {
  - let map: HashMap<i32, i32> = HashMap::default();
  - test_map(map);
  + test_map(HashMap::new());
  }
  }
  