* invoke interruptTask on any subsequent futures.
         */
        callInterruptTask = false;
      }
      // We call this before the listeners in order to avoid needing to manage a separate stack data
      // structure for them.  Also, some implementations rely on this running prior to listeners
      // so that the cleanup work is visible to listeners.

         * invoke interruptTask on any subsequent futures.
         */
        callInterruptTask = false;
      }
      // We call this before the listeners in order to avoid needing to manage a separate stack data
      // structure for them.  Also, some implementations rely on this running prior to listeners
      // so that the cleanup work is visible to listeners.