value_and_universal_traits.scala

trait Printable extends Any {
  def print(): Unit = println(this)
}
class Wrapper(val underlying: Int) extends AnyVal with Printable

object value_and_universal_traits {
  def main(args: Array[String]) {
    val w = new Wrapper(3)
    w.print() // actually requires instantiating a Wrapper instance
  }
}