@Keep
    public static void doThrow(Object arg) {
      if (arg == null) {
        throw new FooException();
      }
    }

    @Keep
    public void noArg() {}

    @Keep
    public void oneArg(String s) {
      checkNotNull(s);
    }

    void packagePrivateOneArg(String s) {
      checkNotNull(s);
    }

    @Keep