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scala> val l = 121 :: 2323 :: 23 :: Nil
l: List[Int] = List(121, 2323, 23)

scala> val x :: y :: _ = l
x: Int = 121
y: Int = 2323

scala> l match { case x :: y :: z :: Nil => true; case _ => false}
res0: Boolean = true

scala> l match { case x :: y :: Nil => true; case _ => false}
res1: Boolean = false

scala> val l = 121 :: 2323 :: 23.2d :: Nil
l: List[AnyVal] = List(121, 2323, 23.2)

scala> val x :: y :: z ::  _ = l
x: AnyVal = 121
y: AnyVal = 2323
z: AnyVal = 23.2
= 23.2