[GHC] #8707: Kind inference fails in data instance definition

[GHC]

#8707: Kind inference fails in data instance definition
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        Reporter:  goldfire          |            Owner:  jstolarek
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 I don't think that'll work for ordinary GADTs.  Remember, for them the
 `TyCon` itself is knot-tied, so attempts to unify with it will yield a
 black hole.  (Ironically it might be ok for data instances.)

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8707#comment:12>
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