docs: public boolean isSyntheticTerminalRule(final TerminalRule rule) {
      AbstractElement _alternatives = rule.getAlternatives();
      if ((_alternatives instanceof Keyword)) {
        AbstractElement _alternatives_1 = rule.getAlternatives();
        String value = ((Keyword) _alternatives_1).getValue();
        String _name = AntlrGrammarGenUtil.<TerminalRule>getOriginalElement(rule).getName();
        String _plus = ("synthetic:" + _name);
        return Objects.equal(_plus, value);
      }
      return false;
    }