[GHC] #9097: Change GHC.Exts.Any to a type family

[GHC]

#9097: Change GHC.Exts.Any to a type family
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        Reporter:  goldfire                      |            Owner:
            Type:  task                          |  goldfire
        Priority:  high                          |           Status:
       Component:  Compiler                      |  closed
      Resolution:  fixed                         |        Milestone:
Operating System:  Unknown/Multiple              |  7.10.1
 Type of failure:  None/Unknown                  |          Version:  7.8.2
       Test Case:  indexed-                      |         Keywords:
  types/should_fail/T9097                        |     Architecture:
        Blocking:                                |  Unknown/Multiple
                                                 |       Difficulty:
                                                 |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Comment (by simonpj):

 Richard: excellent, thank you.  But could you add some comments with the
 defn of `Any` that explain the subtleties.  There is a very good reason
 why `Any` should be a type family, and this should be noted (with a
 pointer to this ticket). And there was a very good reason that it
 initially was a data type, and this too might be worth noting.  The diffs
 don't seem to cover these points unless I'm mis-reading.

 thanks

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9097#comment:7>
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