static abstract class DynSingleFunction extends DynModule {
  transient S buttonText;
  
  *() {}
  *(S *buttonText) {}
  
  JComponent visualize() {
    ret jbutton(or2(buttonText, moduleName), r doItWithEnter);
  }
  
  abstract void doIt();
  
  void doItWithEnter() {
    temp enter();
    doIt();
  }
}