[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:  patch
        Priority:  normal            |            Milestone:  8.2.1
       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):  Phab:D2010
       Wiki Page:                    |
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Changes (by bgamari):

 * status:  new => patch
 * differential:   => Phab:D2010


Comment:

 I've uploaded the current state of my
 [wip/ttypeable](https://github.com/ghc/ghc/compare/master...bgamari:wip/ttypeable)
 branch as Phab:D2010. It's still quite preliminary however it does give
 you a working stage2 compiler with functional type-indexed type
 representations and what I believe is a pretty reasonable set of
 interfaces.

 I've also written up a description of the proposal as I have implemented
 it at Typeable/BenGamari.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11011#comment:38>
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