[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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Changes (by adamgundry):

 * cc: adamgundry (added)


Comment:

 Ben, perhaps I'm missing something (your wiki page doesn't appear to
 define `mkTyCon` or `mkTRApp`), but I don't see why you can't write
 `getTypeRepX` without resorting to `unsafeCoerce`. If `TyCon` is unindexed
 then the first case should just work without it, and in the second case,
 isn't it possible to do a runtime check that the kinds of `rep_f` and
 `rep_x` agree?

 Apologies if I've overlooked something obvious by being late to the party.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11011#comment:30>
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