[GHC] #10343: Make Typeable track kind information better

[GHC]

#10343: Make Typeable track kind information better
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        Reporter:  oerjan            |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:  typeOf ::
 Related Tickets:  #9858             |  Typeable (a::k) => Proxy a ->
                                     |  TypeRep
                                     |                Blocking:
                                     |  Differential Revisions:
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Comment (by goldfire):

 Here's a strange thought: once we have `* :: *`, does `Typeable k a` imply
 `Typeable * k`? It probably should. But then we would have

 {{{
 class Typeable k => Typeable (a :: k) where ...
 }}}

 which has a superclass cycle. The cycle is benign because we know that all
 kinds have type `*`, but it still is a curious beast.

 Of course, this isn't necessary, but it would be nice.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10343#comment:4>
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