[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  |   Difficulty:  Unknown         
    Testcase:                                |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple              |  
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Comment (by dons):

 Seems better suited to a separate 'lint' tool to sanitize .cabal files /
 pragma use and other common issues. No need to bake it into the compiler,
 given the implementation problems.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3085#comment:8>
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