[GHC] #8797: Generics instances for monoid and applicative newtypes

[GHC]

#8797: Generics instances for monoid and applicative newtypes
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        Reporter:  jcristovao  |            Owner:
            Type:  feature     |           Status:  new
  request                      |        Milestone:
        Priority:  normal      |          Version:  7.6.3
       Component:              |         Keywords:
  libraries/base               |     Architecture:  Unknown/Multiple
      Resolution:              |       Difficulty:  Easy (less than 1 hour)
Operating System:              |       Blocked By:
  Unknown/Multiple             |  Related Tickets:
 Type of failure:              |
  None/Unknown                 |
       Test Case:              |
        Blocking:              |
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Comment (by jcristovao):

 ```StandaloneDeriving``` can be used

 Yes, of course, but there is always the (increased) risk of two libraries
 using it, and thus having ```Duplicate instance declarations```. I would
 say its safer to include this in base.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8797#comment:3>
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