ActionController::Flash

# File actionpack/lib/action_controller/metal/flash.rb, line 51
      def redirect_to(options = {}, response_options_and_flash = {}) # :doc:
        self.class._flash_types.each do |flash_type|
          if type = response_options_and_flash.delete(flash_type)
            flash[flash_type] = type
          end
        end

        if other_flashes = response_options_and_flash.delete(:flash)
          flash.update(other_flashes)
        end

        super(options, response_options_and_flash)
      end