gistfile1.scala

/*
jorge-ortizs-macbook-pro:tmp jeortiz$ cat Infix.scala
*/
sealed abstract class LList[+T]
case object NNil extends LList[Nothing]
final case class :::[T](hd: T, tl: LList[T]) extends LList[T]

object Main extends Application {
  val lst = "A" :: "B" :: Nil
  val llst = "A" ::: "B" ::: NNil
  println(lst)
  println(llst)
}

/*
jorge-ortizs-macbook-pro:tmp jeortiz$ scalac Infix.scala
Infix.scala:7: error: value ::: is not a member of object NNil
  val llst = "A" ::: "B" ::: NNil
                         ^
one error found
jorge-ortizs-macbook-pro:tmp jeortiz$

jorge-ortizs-macbook-pro:tmp jeortiz$ scalac -version
Scala compiler version 2.7.2.final -- Copyright 2002-2008, LAMP/EPFL
*/