[Hackage] #567: Allow negation of language extension names by adding/removing "No" in front

[Hackage]

#567: Allow negation of language extension names by adding/removing "No" in front
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  Reporter:  SamB           |        Owner:         
      Type:  enhancement    |       Status:  new    
  Priority:  normal         |    Milestone:         
 Component:  Cabal library  |      Version:  1.6.0.1
  Severity:  normal         |     Keywords:         
Difficulty:  unknown        |   Ghcversion:         
  Platform:                 |  
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 GHC supports this, and it could be useful when features are added or
 removed from the baseline Haskell -- say, record syntax?

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/567>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects