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import collection.mutable._
object Test {
def main(args: Array[String]) {
val dl = DoubleLinkedList[Int]()
dl.remove()
val dl2 = DoubleLinkedList[Int](1, 2, 3)
dl2.next.remove()
assert(dl2 == DoubleLinkedList(1, 3))
val dl3 = DoubleLinkedList[Int](1, 2, 3)
assert(dl3.drop(1) == DoubleLinkedList(2, 3))
assert(dl3.drop(1).prev == null)
}
}
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