[GHC] #3966: Warn about useless UNPACK pragmas

[GHC]

#3966: Warn about useless UNPACK pragmas
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    Reporter:  tibbe             |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  normal            |    Milestone:  6.14.1      
   Component:  Compiler          |      Version:  6.12.1      
    Keywords:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Changes (by igloo):

  * milestone:  => 6.14.1


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3966#comment:1>
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