[GHC] #8486: cannot derive new-typeable instances for promoted data types taking parameters

[GHC]

#8486: cannot derive new-typeable instances for promoted data types taking
parameters
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        Reporter:  aavogt            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  5682
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Comment (by goldfire):

 I'm working on #5682, but I would think that `Typeable` instances for data
 constructors exported from base should also be exported from base.
 Otherwise, there will be orphan instances that might conflict.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8486#comment:4>
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