[GHC] #8813: further support deriving instances Typeable1, Typeable2, etc

[GHC]

#8813: further support deriving instances Typeable1, Typeable2, etc
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        Reporter:  maeder                     |            Owner:
            Type:  task                       |           Status:  closed
        Priority:  normal                     |        Milestone:
       Component:  Compiler                   |          Version:
      Resolution:  wontfix                    |  7.8.1-rc1
Operating System:  Unknown/Multiple           |         Keywords:
 Type of failure:  GHC rejects valid program  |     Architecture:
       Test Case:                             |  Unknown/Multiple
        Blocking:                             |       Difficulty:  Unknown
                                              |       Blocked By:
                                              |  Related Tickets:
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Comment (by maeder):

 What is the problem to add (renamed) copies of Typeable (named TypeableN)
 and add generic instances "TypeableN k => Typeable k" and re-export those
 via Data.Typeable? This would allow to test unmodified existing code!!!

 (These intermediate TypeableN classes may be marked to be deprecated
 later)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8813#comment:4>
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