[GHC] #11174: Traversable can't be derived for datatypes with unboxed arguments

[GHC]

#11174: Traversable can't be derived for datatypes with unboxed arguments
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        Reporter:  RyanGlScott       |                Owner:  RyanGlScott
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:  Generics
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1908
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => patch
 * differential:   => Phab:D1908


Comment:

 I've uploaded a Phab:D1908, based on the design philosophy outlined in
 [https://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/DeriveFunctor#Proposal:alternativestrategyforderivingFoldableandTraversable
 this wiki page].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11174#comment:3>
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