# File lib/racc/grammar.rb, line 643
    def hash=(n)
      @hash = n
      ptrs = []
      @symbols.each_with_index do |sym, idx|
        ptrs.push LocationPointer.new(self, idx, sym)
      end
      ptrs.push LocationPointer.new(self, @symbols.size, nil)
      @ptrs = ptrs
    end