value classes matchers

Welcome to Scala version 2.11.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_71).
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scala> class ID(val id:Long) extends AnyVal
defined class ID

scala> import org.specs2.mock.Mockito
import org.specs2.mock.Mockito

scala> class Test extends Mockito{
     | val anyID = any[Long].asInstanceOf[ID]
     | }
defined class Test

scala> new Test().anyID
java.lang.ClassCastException: java.lang.Long cannot be cast to ID
  ... 44 elided

scala> class SID(val id:Long) extends AnyVal
defined class SID

scala> class Test2 extends Mockito{
     | val anySID = any[String].asInstanceOf[SID]
     | }
defined class Test2

scala> new Test2().anySID
java.lang.NullPointerException
  ... 44 elided