File: t0152.scala

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scala 2.11.12-6
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class Value[+T](x: T) {
    def value = x
}

trait PlusOne extends Value[Int] {
    override def value = super.value + 1
}

object Test extends App {
 object boom extends Value[java.lang.String]("foo") with PlusOne

 println(boom.value) // class cast exception!
}