}
    }
  }

  public void testNullRejectingInterfaceDefaultValue() {
    new NullRejectingInterfaceDefaultValueChecker().check();
  }

  private static class MultipleInterfacesDefaultValueChecker extends DefaultValueChecker {

    @SuppressWarnings("unused") // called by NullPointerTester
    @Keep
    public <T extends FromTo<String, Integer> & Supplier<Long>> void checkArray(T f, String s) {