Decorator.scala

trait Printer {

  def print(s: String) = println(s)

}

trait UpperPrinter extends Printer {

  override def print(s: String) = super.print(s.toUpperCase)

}

trait DoublePrinter extends Printer {

  override def print(s: String) = super.print(s * 2)

}

trait PrettyPrinter extends Printer {

  override def print(s: String) = super.print(s"*** $s ***")

}

val x = new {} with Printer with PrettyPrinter with DoublePrinter
x.print("hello")