# File lib/facet/lisp.rb, line 83
    def each(&block)
      if @first
        if @first.is_a? DottedPair
          @first.each(&block)
        else
          block.call(@first)
        end
      end
      if @second
        if @second.is_a? DottedPair
          @second.each(&block)
        else
          block.call(@second)
        end
      end
    end