# File lib/sass/script/parser.rb, line 70
      def parse(css_variable = false)
        if css_variable
          @css_variable_warning = CssVariableWarning.new
        end

        expr = assert_expr :expr
        assert_done
        expr.options = @options
        check_for_interpolation expr

        if css_variable
          @css_variable_warning.value = expr
        end

        expr
      rescue Sass::SyntaxError => e
        e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
        raise e
      end