Scala中的或模式匹配

Question

我在scala中有这种模式匹配

(col, el, rbt1, rbt2) match {
  case (Black, z, Node(Red, y, Node(Red, x, a, b), c), d) => Node(Red, y, Node(Black, x, a, b), Node(Black, z, c, d))
  case (Black, z, Node(Red, x, a, Node(Red, y, b, c)), d) => Node(Red, y, Node(Black, x, a, b), Node(Black, z, c, d))
  case (Black, x, a, Node(Red, y, b, Node(Red, z, c, d))) => Node(Red, y, Node(Black, x, a, b), Node(Black, z, c, d))
  case (Black, x, a, Node(Red, z, Node(Red, y, b, c), d)) => Node(Red, y, Node(Black, x, a, b), Node(Black, z, c, d))
  case _ => Node(col, el, rbt1, rbt2)
}

所有情况在=>之后都做相同的事情（最后一个除外）。 因此，我尝试以这种方式更改代码：

(col, el, rbt1, rbt2) match {
  case (Black, z, Node(Red, y, Node(Red, x, a, b), c), d)
       | (Black, z, Node(Red, x, a, Node(Red, y, b, c)), d)
       | (Black, x, a, Node(Red, y, b, Node(Red, z, c, d)))
       | (Black, x, a, Node(Red, z, Node(Red, y, b, c), d)) => Node(Red, y, Node(Black, x, a, b), Node(Black, z, c, d))
  case _ => Node(col, el, rbt1, rbt2)
}

但是它不能编译。 Scala说它不识别y，x等...为什么？如何在Scala中使用or-pattern？