[GHC] #9858: Typeable instances should be kind-aware

[GHC]

#9858: Typeable instances should be kind-aware
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        Reporter:  dreixel           |                   Owner:  dreixel
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by simonpj):

 Folks, we need an interim solution for 7.10.  A full fix sounds as if
 it'll take a little longer.  But I'm anxious about releasing 7.10 with the
 ability to write `unsafeCoerce` in Safe Haskell.

 One drastic remedy: do not derive `Typeable` for polykinded type
 constructors.  That would be easy to implement, and would certainly fix
 it.  But it's a bit drastic.

 Any other offers?  We need to do this in the next two weeks.

 Better still would be to fix it properly of course.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9858#comment:24>
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