open class KList<E> : List<E> {
    override val size: Int
        get() = throw UnsupportedOperationException()

    override fun isEmpty(): Boolean {
        throw UnsupportedOperationException()
    }
    override fun contains(o: E) = true
    override fun containsAll(c: Collection<E>) = true

    override fun iterator(): Iterator<E> {
        throw UnsupportedOperationException()
    }

    override fun get(index: Int): E {
        throw UnsupportedOperationException()
    }

    override fun indexOf(element: E): Int {
        throw UnsupportedOperationException()
    }

    override fun lastIndexOf(element: E): Int {
        throw UnsupportedOperationException()
    }

    override fun listIterator(): ListIterator<E> {
        throw UnsupportedOperationException()
    }

    override fun listIterator(index: Int): ListIterator<E> {
        throw UnsupportedOperationException()
    }

    override fun subList(fromIndex: Int, toIndex: Int): List<E> {
        throw UnsupportedOperationException()
    }
}

fun box() = J.foo()