code: public static Key<String> key(String name) {
      return Key.get(String.class, Flags.named(name));
    }
docs: Builds a {@code com.google.inject.Key} over a String type annotated
  with {@code @}{@link Flag}(named)
  
  @see <a href="https://github.com/google/guice/blob/master/core/src/com/google/inject/Key.java"></a>