[GHC] #13327: Figure out how to make sense of Data instances for poly-kinded datatypes

[GHC]

#13327: Figure out how to make sense of Data instances for poly-kinded datatypes
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               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:  #4028             |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 The whole `dataCast1`, `dataCast2` business is clearly a hack.  It
 predates kind polymorphism.  Could it be cleaned up now we have kind
 polymorphism?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13327#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler