# File lib/racc/logfilegenerator.rb, line 47
    def output_useless(out)
      used = []
      @grammar.each do |rl|
        if rl.useless?
          out.printf "rule %d (%s) never reduced\n",
                     rl.ident, rl.target.to_s
        end
      end
      @grammar.each_nonterminal do |t|
        if t.useless?
          out.printf "useless nonterminal %s\n", t.to_s
        end
      end
    end