Implementing the repeat loop in Scala

repeat.scala

/*
Enables loops such as this:

var i = 10
repeat {
  print(s"i is $i\n")
  i = i - 1
} until (i == 0)
*/

class Until(command: => Unit) {
  def until(cond: => Boolean): Unit = {
    command
    if (cond) () else until(cond)
  }
}

object repeat {
  def apply(command: => Unit) = new Until(command)
}