[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:  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     |  
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Comment (by NeilMitchell):

 HLint 1.6.6 above above can warn on unused language extensions:
 http://community.haskell.org/~ndm/hlint

 The hints are limited to those extensions which enable new syntax, but
 have spotted unused extensions for me.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3085#comment:18>
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