public abstract interface SubclassOfCollection<E : R|ft<kotlin/Any, kotlin/Any?>!|> : R|kotlin/collections/MutableCollection<ft<@FlexibleNullability E, E?>!>| {
    public abstract operator fun iterator(): R|@FlexibleNullability kotlin/collections/MutableIterator<ft<@FlexibleNullability E, E?>!>|

}
