`You did!' said the Hatter.

  `I deny it!' said the March Hare.

  `He denies it,' said the King:  `leave out that part.'

  `Well, at any rate, the Dormouse said--' the Hatter went on,
looking anxiously round to see if he would deny it too:  but the
Dormouse denied nothing, being fast asleep.

  `After that,' continued the Hatter, `I cut some more bread-
and-butter--'

  `You did!' said the Hatter.

  `I deny it!' said the March Hare.

  `He denies it,' said the King:  `leave out that part.'

  `Well, at any rate, the Dormouse said--' the Hatter went on,
looking anxiously round to see if he would deny it too:  but the
Dormouse denied nothing, being fast asleep.

  `After that,' continued the Hatter, `I cut some more bread-
and-butter--'

 * successfully cancelled step will immediately start closing all objects captured for later closing
 * by it and by its input steps.
 *
 * <h3>Ending a pipeline</h3>
 *
 * Each {@code ClosingFuture} pipeline must be ended. To end a pipeline, decide whether you want to
 * close the captured objects automatically or manually.
 *
 * <h4>Automatically closing</h4>
 *