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object Test extends App {
println(List(1,2,3) match {
case Nil => List(0)
// since the :: extractor's argument must be a ::, there has to be a cast before its unapply is invoked
case x :: y :: z :: a :: xs => xs ++ List(x)
case x :: y :: z :: xs => xs ++ List(x)
case _ => List(0)
})
}
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