code: 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;
      }
docs: <p>
  Error messages for any events that could not be retrieved.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setFailedSet(java.util.Collection)} or {@link #withFailedSet(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param failedSet
  Error messages for any events that could not be retrieved.
  @return Returns a reference to this object so that method calls can be chained together.