    # File lib/facets/more/lisp.rb, line 73
        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