[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):

 Yes, I see your point. I guess I have indeed done something silly and that
 `unsafeCoerce` may be the only way forward. This means that an invalid
 input file could cause a segfault. But I suppose that's just the old
 "garbage in, garbage out" situation.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11011#comment:29>
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