@Keep
    public void foo(HardToCreate ignored, String required) {
      checkNotNull(ignored);
      checkNotNull(required);
    }
  }

  public void testCannotCreateDefault() {
    shouldFail(new CannotCreateDefault());
  }

  private static void shouldPass(Object instance, Visibility visibility) {
    new NullPointerTester().testInstanceMethods(instance, visibility);
  }