[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:         |            Owner:
  PVerswyvelen            |           Status:  new
            Type:         |        Milestone:  7.6.2
  feature request         |          Version:  6.10.1
        Priority:         |         Keywords:  warnings extensions language
  normal                  |     Architecture:  Unknown/Multiple
       Component:         |       Difficulty:  Unknown
  Compiler                |       Blocked By:
      Resolution:         |  Related Tickets:
Operating System:         |
  Unknown/Multiple        |
 Type of failure:         |
  None/Unknown            |
       Test Case:         |
        Blocking:         |
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Changes (by asr):

 * cc: asr@… (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3085#comment:30>
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