// OLD version
sbool ai_ruleAccessesInput(S rule) {
  L<S> tok = javaTokC(rule);
  S t;
  if (contains(tok, "ai_input")) true;
  for i over tok:
    if (eqGet(tok, i+1, "(") && isIdentifier(t = tok.get(i)))
      if (eq(t, "i") || swic(t, "input") || ewic(t, "input")) true;
  false;
}

// NEW version
sbool ai_ruleAccessesInput(IfThen rule) {
  final new Flag flag;
  nlLogic_visit(rule.in, voidfunc(O o) {
    if (o cast Func) {
      S t = o.name;
      if (eqOneOf(t, "i", "phrase") || swic(t, "input") || ewic(t, "input"))
        flag.raise();
    }
    if (o cast Exp)
      if (jcontains(o.text(), "ai_input()")) flag.raise();
  });
  ret flag.isUp();
}

Began life as a copy of #1017925