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// goes well with the stage {} macro (see tok_stages)
srecord Stages2(L<Stages2.Stage> stages) is Steppable, Runnable {
  int iStage;
  Stage stage;
  
  // set this to record timing for each stage
  settable FunctionTimings<S> timings;
  
  { stages = new L; }
  
  record noeq Stage(S name, Runnable body) {
    run {
      if (timings != null)
        timings.do(name, body);
      else
        callF(body);
    }
  }
  
  public bool step() {
    // What is this funny syntax
    if (iStage >= l(stages)) false;
    stages.get(iStage++).run();
    true;
  }
  
  Stage stage(Stage stage) {
    stages.add(stage);
    ret stage;
  }
  
  Stage stage(S name, Runnable body) {
    ret stage(new Stage(name, body));
  }
  
  run { stepAll(this); }
  
  int indexOfStage(Stage stage) {
    ret stages.indexOf(stage);
  }
  
  void stepUntilStage(Stage stage) {
    int index = indexOfStage(stage);
    while (iStage <= index && step()) {}
  }
}