gistfile1.scala

    def skipLast[T](s: Stream[T], c: Int): Stream[T] = {
      var buf = s take c
      s drop c flatMap { x =>
        val h = if (!buf.isEmpty)
          Stream(buf.head) else Stream()
        buf = buf.drop(1) :+ x
        h
      }
    }

def skipLast[T](stream: Stream[T], count: Int): Stream[T] = {
  val q = scala.collection.mutable.Queue[T]()
  for(
    i <- stream
    if ((q += i).size > count)
  ) yield q.dequeue()
}