# File lib/rspec/core/configuration_options.rb, line 11
      def configure(config)
        keys = order(options.keys, :libs, :requires, :default_path, :pattern)

        formatters = options[:formatters] if keys.delete(:formatters)

        config.exclusion_filter.merge! options[:exclusion_filter] if keys.delete(:exclusion_filter)

        keys.each do |key|
          config.send("#{key}=", options[key]) if config.respond_to?("#{key}=")
        end

        formatters.each {|pair| config.add_formatter(*pair) } if formatters
      end