# File lib/racc/grammar.rb, line 239
      def _add(target, x)
        case x
        when Sym
          @delayed.each do |rule|
            rule.replace x, target if rule.target == x
          end
          @grammar.symboltable.delete x
        else
          x.each_rule do |r|
            r.target = target
            @grammar.add r
          end
        end
        flush_delayed
      end