[GHC] #4925: Use explicit language extensions in base

[GHC]

#4925: Use explicit language extensions in base
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    Reporter:  basvandijk        |       Owner:                
        Type:  task              |      Status:  new           
    Priority:  normal            |   Component:  libraries/base
     Version:  7.0.1             |    Keywords:                
    Testcase:                    |   Blockedby:                
          Os:  Unknown/Multiple  |    Blocking:                
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown  
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 Attached is a darcs patch that removes the extension fields from
 `base.cabal` and adds `LANGUAGE` pragmas where needed.

 A module becomes more modular when it explicitly declares which language
 extensions are needed to build it. It doesn't need to depend on an
 external build script like a make or cabal file.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4925>
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