return isSubtype(listOfList);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public Iterable<? extends List<?>> listOfWildcardListOfWildcard(
        List<? extends List<?>> listOfList) {
      return isSubtype(listOfList);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)