static O parseBottomUp_parser;

// only parse, no explain
static synchronized O parseBottomUp(S text, S rules) {
  if (parseBottomUp_parser == null) {
    parseBottomUp_parser = run(#1002719);
    setOpt(parseBottomUp_parser, keepRules := true);
  }
  ret call(parseBottomUp_parser, "parse", text, rules);
}