[GHC] #13097: Num a => Num (Down a)

[GHC]

#13097: Num a => Num (Down a)
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 These instances feel extremely straightforward and uncontroversial to me.
 Mind whipping up a Phabricator Diff to add them?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13097#comment:5>
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