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trait Option[a] {}
case class Some[a](x: a) extends Option[a];
case class None[a]() extends Option[a];
module test {
def println(str: String): Unit = java.lang.System.out.println(str);
def print(opt: Option[String]) = opt match {
case Some(x) => println(x);
case None() => println("nothing");
}
}
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