File: t1545.scala

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scala 2.9.2%2Bdfsg-1
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object Main extends App {

    case class Foo (field : Option[String])

    val x : PartialFunction[Foo,Int] =
        {
            c => c.field match {
                case Some (s) => 42
                case None     => 99
            }
        }
        
    println (x (Foo (None))) // prints 99
    println (x (Foo (Some ("foo")))) // prints 42
        
}