[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:  dreixel
            Type:  task                       |           Status:  closed
        Priority:  normal                     |        Milestone:  7.8.1
       Component:  libraries/base             |          Version:
      Resolution:  fixed                      |  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 George):

 It seems this fix might allow quickspec to compile unmodified in RC2. In
 RC1 it fails with
 {{{
 [ 3 of 20] Compiling Test.QuickSpec.Utils.Typeable (
 src/Test/QuickSpec/Utils/Typeable.hs,
 dist/build/Test/QuickSpec/Utils/Typeable.o )

 src/Test/QuickSpec/Utils/Typeable.hs:9:59:
     Not in scope: type constructor or class ‛T.Typeable1’
     Perhaps you meant ‛T.Typeable’ (imported from Data.Typeable)

 src/Test/QuickSpec/Utils/Typeable.hs:9:72:
     Not in scope: type constructor or class ‛T.Typeable2’
     Perhaps you meant ‛T.Typeable’ (imported from Data.Typeable)
 Failed to install quickspec-0.9.2
 }}}

 Just thought you might want to know of examples where this fix is indeed
 helpful

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8813#comment:41>
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