Marking primitive types with phantom types in Scala

Question

In Scala I can use the concept of phantom types (as described e.g. here) to mark types and have this information erased at runtime. I wonder whether it is possible to mark primi

Answer 1

The following works for me:

trait IsPrime
val x = 5.asInstanceOf[Int with IsPrime]
val y:Int = x

val z:Int with IsPrime = 6 /* this line causes a compile error
                              which is what you want */