static LS phraseCache_group(PhraseCache cache, LS tok) {
  if (cache == null) ret tok;
  tok = cloneList(tok);
  for (int i = 1; i < l(tok); i += 2) {
    L<LS> phrases = cache.byFirstWord.get(tok.get(i));
    new Best<LS> best;
    for (LS phrase : phrases)
      if (codeTokenSubListEqualsIC_skipFirst(tok, phrase, i))
        best.put(phrase, l(phrase));
    if (best.has()) {
      int j = i+l(best!)-3;
      tok_addCurlyBracketsAroundPart(tok, i, j);
      i = j;
    }
  }
  ret tok;
}

static LS phraseCache_group(PhraseCache cache, S s) {
  ret phraseCache_group(cache, javaTokNPunctuation(s));
}

Began life as a copy of #1022268