    # File lib/facets/more/downloader.rb, line 78
      def add_mirrors( mirrors )
        mirrors.each { |mirror|
          case mirror
          when String
            url, rgn = *mirror.strip.split(' ')
            add_mirror( url, rgn.unbracket )
          when Array
            add_mirror( *mirror )
          when Hash
            add_mirror( mirror[:url], mirror[:region] )
          when Mirror
            @mirrors << mirror
          else
            raise "unrecogized mirror definition #{mirror.inspect}"
          end
        }
      end