how-it-works-seven.kt

suspend fun setupMovies(completion: Continuation<Any?>) {
    val continuation = completion as? SetupMoviesStateMachine 
	?: SetupMoviesStateMachine(completion)

    when(continuation.label) {
       0 -> {
          makeLogin("someValue", "someValue", continuation)
          continuation.label = 1
       }
       1 -> {
	  continuation.token = continuation.result as Token
          loadMovies(continuation.token, continuation)
          continuation.label = 2
       }
       2 -> {
	  continuation.movies = continuation.result as as List<Movie>
          printMovies(continuation.movies as List<Movie>, continuation)
          continuation.label = 3
       }
       3 -> {
          continuation.resume(Unit)
      }
      else -> throw IllegalStateException(...)
   } 
}