import scala.collection.immutable.VectorBuilder
 
class Node
 
trait NodeList {
  def getLength: Int
  def item(index: Int): Node
}
 
object NodeListSanity {
  implicit def nodeListToIndexedSeq(nodeList: NodeList): IndexedSeq[Node] = {
    val builder = new VectorBuilder[Node]
    for (index <- 0 to nodeList.getLength - 1) {
      builder += nodeList.item(index)
    }
    builder.result
  }
}
 
object Main extends App {
  import NodeListSanity._
 
  val list = new NodeList { def getLength = 2; def item(index: Int) = new Node }
 
  println(list(0))
  println(list(1))
  println(list(2))
}
 

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