[GHC] #9818: Add `Natural` number type to `base`

[GHC]

#9818: Add `Natural` number type to `base`
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              Reporter:  hvr         |            Owner:  hvr
                  Type:  feature     |           Status:  closed
  request                            |        Milestone:  7.10.1
              Priority:  normal      |          Version:
             Component:  Core        |         Keywords:  base natural
  Libraries                          |     Architecture:  Unknown/Multiple
            Resolution:  fixed       |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:  #3650 #9281
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D473   |
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Comment (by thomie):

 The comment about @Natural@ in `libraries/base/Data/Word.hs` can be
 deleted or changed to point to this new module.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9818#comment:10>
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