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

[GHC]

#3085: warn about language extensions that are not used
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 Reporter:  PVerswyvelen                  |          Owner:                  
     Type:  feature request               |         Status:  new             
 Priority:  normal                        |      Milestone:                  
Component:  Compiler                      |        Version:  6.10.1          
 Severity:  normal                        |     Resolution:                  
 Keywords:  warnings extensions language  |       Testcase:                  
       Os:  Unknown/Multiple              |   Architecture:  Unknown/Multiple
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Changes (by NeilMitchell):

 * cc: ndmitchell at gmail.com (added)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3085#comment:2>
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