[GHC] #3085: warn about language extensions that are not used

[GHC]

#3085: warn about language extensions that are not used
------------------------------+---------------------------------------------
  Reporter:  PVerswyvelen     |          Owner:                              
      Type:  feature request  |         Status:  new                         
  Priority:  normal           |      Milestone:  6.14.1                      
 Component:  Compiler         |        Version:  6.10.1                      
Resolution:                   |       Keywords:  warnings extensions language
Difficulty:  Unknown          |             Os:  Unknown/Multiple            
  Testcase:                   |   Architecture:  Unknown/Multiple            
   Failure:  None/Unknown     |  
------------------------------+---------------------------------------------
Changes (by igloo):

  * failure:  => None/Unknown
  * milestone:  6.12.1 => 6.14.1

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3085#comment:17>
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