Caused by: java.lang.ClassCastException: uk.ac.turingatemyhamster.vw152093.ExtendedNodeList cannot be cast to scala.collection.Traversable
	at scala.collection.generic.TraversableFactory$GenericCanBuildFrom.apply(TraversableFactory.scala:44)
	at scala.collection.TraversableLike$class.map(TraversableLike.scala:204)
	at uk.ac.turingatemyhamster.vw152093.ExtendedNodeList.map(Scrape.scala:45)

case class ExtendedNodeList(nl: NodeList) extends IndexedSeqLike[Node, List[Node]] {
  def length: Int = nl.getLength
  def apply(i: Int) = nl.item(i)
  def newBuilder = List.newBuilder
}