[GHC] #9429: Alternative to type family Any

[GHC]

#9429: Alternative to type family Any
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              Reporter:  mboes       |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.9
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:  9097, 9380
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by mboes):

 Making pattern-matching `Any`-aware makes sense to me. Again, I'm not
 qualified to understand what the best way forward is here. But to answer
 carter's question, ultimately for the purposes of `rank1dynamic` (and by
 extension Cloud Haskell), what we need is way of reifying more polymorphic
 types than we currently can.

 Introducing some kind of `PolyTypeable` mechanism could certainly bypass
 the question at hand. Really not sure how such an extension would work
 though.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9429#comment:9>
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