other arm curled round her head.  Still she went on growing, and,
as a last resource, she put one arm out of the window, and one
foot up the chimney, and said to herself `Now I can do no more,
whatever happens.  What WILL become of me?'

  Luckily for Alice, the little magic bottle had now had its full
effect, and she grew no larger:  still it was very uncomfortable,

             * exception in seenExceptions. When we complete secondFuture with the same exception,
             * we want for AggregateFuture to still detect that it's been previously seen.
             */
            secondFuture.setException(sameInstance);
          }
        },
        directExecutor());
    firstFuture.setException(sameInstance);

other arm curled round her head.  Still she went on growing, and,
as a last resource, she put one arm out of the window, and one
foot up the chimney, and said to herself `Now I can do no more,
whatever happens.  What WILL become of me?'

  Luckily for Alice, the little magic bottle had now had its full
effect, and she grew no larger:  still it was very uncomfortable,