[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:  7.12.1
       Component:  Compiler          |                 Version:  6.10.1
      Resolution:                    |                Keywords:  warnings
Operating System:  Unknown/Multiple  |  extensions language
 Type of failure:  None/Unknown      |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:  #9757             |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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Changes (by asr):

 * cc: asr@… (removed)
 * cc: asr (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3085#comment:39>
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