static WordTokRule wordTokReplacerRule(S sentence, S _vars, S replaced) {
  LS tokReplaced = wordTok(replaced);
  class WordTokReplacer extends WordTokRule {
    *() { super(sentence, asCISet(javaTokC(_vars))); }
    run { emit(join(replaceCodeTokensUsingMap(tokReplaced, map))); }
  }
  ret new WordTokReplacer;
}