// changes the original dialogs
static L<Dialog> expandDialogs(L<Dialog> dialogs) {
  for (Dialog d : dialogs)
    for (int i = 0; i < l(d.poem); i++) {
      E e = d.poem.get(i);
      if (!e.state()) continue;
      int idx = e.text().indexOf('=');
      if (idx < 0) continue;
      d.poem.set(i, E.state("get " + e.text().substring(0, idx)));
      d.poem.add(i+1, E.state("result is " + e.text().substring(idx+1)));
    }
  ret dialogs;
}