# File lib/sass/script/unary_operation.rb, line 22
    def to_sass(opts = {})
      operand = @operand.to_sass(opts)
      if @operand.is_a?(Operation) ||
          (@operator == :minus &&
           (operand =~ Sass::SCSS::RX::IDENT) == 0)
        operand = "(#{@operand.to_sass(opts)})"
      end
      op = Lexer::OPERATORS_REVERSE[@operator]
      op + (op =~ /[a-z]/ ? " " : "") + operand
    end