[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 goldfire):

 If we have an un-indexed `TyCon` type (an idea I quite like), then we can
 do something like this:

 {{{
 splitPolyTyConApp :: TypeRep a -> (TyCon, [TypeRepX])
 }}}

 which gets you all the arguments. But it loses all connection with the
 original type.

 In other news, nowhere on Hackage (as downloaded sometime in the fall) is
 `splitPolyTyConApp` used. So maybe we just drop it.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11011#comment:19>
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