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class IntMap[+V]
case class Bin[+T](m: IntMap[T]) extends IntMap[T]
case class Tip[+T](x: T) extends IntMap[T]
trait IntMapIterator[V, T] {
def valueOf(tip: Tip[V]): T
def pop: IntMap[V]
def next: T =
pop match {
case Bin(t@Tip(_)) => {
valueOf(t)
}
}
}
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