code: def list_comment(self, node, elem, minel):
          
          lo = "0" if minel is None else minel.arg
          maxel = node.search_one("max-elements")
          hi = "" if maxel is None else maxel.arg
          elem.insert(0, etree.Comment(
              " # entries: %s..%s " % (lo, hi)))
          if node.keyword == 'list':
              elem.insert(0, etree.Comment(
                  " # keys: " + ",".join([k.arg for k in node.i_key])))
docs: Add list annotation to `elem`.