gistfile1.scala

➜  ~  scala
Welcome to Scala version 2.9.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_41).
Type in expressions to have them evaluated.
Type :help for more information.

scala> object & {
     | def unapply[A](a: A): Option[(A, A)] = Some((a, a))
     | }
defined module $amp

scala> val (a :: b :: c) & (d :: _) = List(1,2,3)
a: Int = 1
b: Int = 2
c: List[Int] = List(3)
d: Int = 1

scala>