# File lib/sass/script/lexer.rb, line 150
      def whitespace?(tok = @tok)
        if tok
          @scanner.string[0...tok.pos] =~ /\s\Z/
        else
          @scanner.string[@scanner.pos, 1] =~ /^\s/ ||
            @scanner.string[@scanner.pos - 1, 1] =~ /\s\Z/
        end
      end