new NonGenericTypeTokenDefaultValueChecker().check();
  }

  private interface FromTo<F, T> extends Function<F, T> {}

  private static class GenericInterfaceDefaultValueChecker extends DefaultValueChecker {

    @SuppressWarnings("unused") // called by NullPointerTester
    @Keep
    public void checkArray(FromTo<String, Integer> f, String s) {
      calledWith(f, s);