static void ai_spec_tripelize(S s) {
  if (tok_containsSimpleArrow(tok_combineCurlyBrackets(javaTok(s)))) ret;
  new Matches m;
  T3<S> t = ai_tripelize(s);
  if (!ai_trivialTriple(t))
    ai_postTriple(s, "possibly parses to triple", ai_renderTriple(t));
}