# File lib/sass/script/operation.rb, line 37
    def to_sass(opts = {})
      pred = Sass::Script::Parser.precedence_of(@operator)
      o1 = operand_to_sass @operand1, :left, opts
      o2 = operand_to_sass @operand2, :right, opts
      sep =
        case @operator
        when :comma; ", "
        when :concat; " "
        else; " #{Lexer::OPERATORS_REVERSE[@operator]} "
        end
      "#{o1}#{sep}#{o2}"
    end