# File lib/http/cookie_jar/abstract_saver.rb, line 11
    def implementation(symbol)
      @@class_map.fetch(symbol)
    rescue IndexError
      begin
        require 'http/cookie_jar/%s_saver' % symbol
        @@class_map.fetch(symbol)
      rescue LoadError, IndexError
        raise IndexError, 'cookie saver unavailable: %s' % symbol.inspect
      end
    end