code: function () {                                                       // 198
      var self = this;                                                             // 199
      _.each(self._dict, function (k, v) {                                         // 200
        if (v.next === v)                                                          // 201
          throw new Error("Next is a loop");                                       // 202
        if (v.prev === v)                                                          // 203
          throw new Error("Prev is a loop");                                       // 204
      });                                                                          // 205
    }
docs: 197