static SS functionsToComments() {
  new SS map;
  S src = myJavaSource();
  for (L<S> tok : tok_findMainFunctions(src)) {
    S comments = trim(get(tok, 0));
    if (nempty(comments)) {
      S name = tok_functionName(tok);
      map.put(name, comments);
    }
  }
  ret map;
}