[GHC] #11011: Add type-indexed type representations (`TypeRep a`)

[GHC]

#11011: Add type-indexed type representations (`TypeRep a`)
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        Reporter:  bjmprice          |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 * Yes I hypothesise that when we have #11471 done (which will be soon) we
 can lift the restriction on partial applications of unboxed types.  I
 don't remember why the restriction is there anyway; it may be that we can
 simply lift it.

 * The entire business of "querying the kinds at which a `TyCon` is
 instantiated" seems moot once types and kinds are unified.  I.e. now.
 Doesn't the same decompose-type-application stuff work for kinds?

 * Yes, the main reason for `TyCon` is to be able to ask for its name, etc.
 Maybe other meta-data too in due course.  SO I agree with comment:12.  But
 let's not expose the internal representation of either `TypeRep` or
 `TyCon`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11011#comment:13>
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