Use this result if you don't want AWS-Scala to report activity completion (or success) back to SWF.
Use this result if you don't want AWS-Scala to report activity completion (or success) back to SWF. For example, use this if your activity function spawns a long-running task in another thread pool, and you will take care of reporting back to SWF when that task completes.
If the activity returns this result, AWS-Scala will report to SWF with an ActivityTaskFailed using the same reason and detail (note: only the first 256 chars of reason will be used).
If the activity returns this result, AWS-Scala will report to SWF with an ActivityTaskCompleted using the same output.