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