class Looper {
    fun doIteration() {
        //run loop until the next call to yield, then return from this function
    }

    fun loop() {
        for (i in 0 until 10) {
            println(i)
            yield()
        }
    }
}

fun main(args: Array<String>) {
    val looper = Looper()
    
    looper.doIteration() //prints "0"
    looper.doIteration() //prints "1"
}