implementing the repeat until (like do while) only with basic scala constructs

RepeatTest.scala

object RepeatTest {

  class RepeatHelper(cmd: => Unit) {
    def until(cond: => Boolean): Unit = if (cond) repeat(cmd)
  }

  def repeat(cmd: => Unit): RepeatHelper = {
    cmd
    new RepeatHelper(cmd)
  }

  def main(args: Array[String]): Unit = {
    var x = 3
    repeat {x = x - 1; println(x)} until (x > 0)
  }
}