docs: public DescribeEventDetailsResult withFailedSet(EventDetailsErrorItem... failedSet) {
          if (this.failedSet == null) {
              setFailedSet(new java.util.ArrayList<EventDetailsErrorItem>(failedSet.length));
          }
          for (EventDetailsErrorItem ele : failedSet) {
              this.failedSet.add(ele);
          }
          return this;
      }