[Hackage] #370: Check that packages declare language extensions accurately

[Hackage]

#370: Check that packages declare language extensions accurately
----------------------------+-----------------------------------------------
  Reporter:  guest          |        Owner:           
      Type:  defect         |       Status:  new      
  Priority:  normal         |    Milestone:  Cabal-2.0
 Component:  Cabal library  |      Version:  HEAD     
  Severity:  normal         |   Resolution:           
  Keywords:                 |   Difficulty:  normal   
Ghcversion:  6.8.2          |     Platform:           
----------------------------+-----------------------------------------------
Changes (by duncan):

  * summary:  Check for use of -X flags on upload => Check that packages
              declare language extensions accurately

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/370#comment:2>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects