File: patterns1.scala

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scala 2.11.12-6
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trait Option[+a]

case class Some[a](x: a) extends Option[a]

case object None extends Option[Nothing]

object 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")
  }
}