FromTo<?, ?> returnValue = (FromTo<?, ?>) defaultFunction.apply(null);
      assertEquals("", returnValue.apply(null));
    }
  }

  public void testGenericInterfaceReturnedByGenericMethod() {
    new GenericInterface2DefaultValueChecker().check();
  }

  private abstract static class AbstractGenericDefaultValueChecker<T> extends DefaultValueChecker {