static void ai_activeSpec_answerChatLine(S line) {
  ret if ai_textOfChatLine(line) == null;
  ret unless is(line, 'recent);
  ret if has(line, "was", "answered in the chat");
  S a = ai_text("$X", "answers", line);
  ret if empty(a);
  if (swic(line, "smart bot's chat")
    ? postToSmartBotsChat(a) : postToStefansChat(a))
    post(line, "was", "answered in the chat");
}