Mimicking loops in Scala

repeat-until.scala

import scala.language.reflectiveCalls

def repeat(command: => Unit) = new {
    def until(condition: => Boolean): Unit =
        if (condition) {
            command
            until(condition)
        } else ()
}

var x = 10

repeat {
    println(x)
    x = x - 1
} until (x > 0)