File: t628.scala

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scala 2.11.12-6
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object Test {
  abstract class Unit
  object NoUnit extends Unit
  object Hour extends Unit

  case class Measure(scalar: Double, unit: Unit) {
    def *(newUnit: Unit): Measure = Measure(scalar, newUnit)
  }

  implicit def double2Measure(scalar: Double) =
    Measure(scalar, NoUnit)


  def main(args: Array[String]): scala.Unit = {
    Console.println("3.0 * Hour = " + (3.0 * (Hour: Unit)))
  }
}