simulating a knight's move

gistfile1.scala

scala> case class KnightPos(c: Int, r: Int)
defined class KnightPos

scala> :pa
// Entering paste mode (ctrl-D to finish)

case class KnightPos(c: Int, r: Int) {
  def move: List[KnightPos] = 
    for {
      KnightPos(c2, r2) <- List(KnightPos(c + 2, r - 1), KnightPos(c + 2, r + 1),
      KnightPos(c - 2, r - 1), KnightPos(c - 2, r + 1)
,
      KnightPos(c + 1, r - 2), KnightPos(c + 1, r + 2),
      KnightPos(c - 1, r - 2), KnightPos(c - 1, r + 2)) if (
      ((1 |-> 8) contains c2) && ((1 |-> 8) contains r2))
    } yield KnightPos(c2, r2)
}

// Exiting paste mode, now interpreting.

defined class KnightPos