[GHC] #1666: -Werror aborts too early

[GHC]

#1666: -Werror aborts too early
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    Reporter:  simonmar          |        Owner:                         
        Type:  bug               |       Status:  new                    
    Priority:  normal            |    Milestone:  6.14.1                 
   Component:  Compiler          |      Version:  6.6.1                  
    Keywords:                    |   Difficulty:  Easy (less than 1 hour)
          Os:  Unknown/Multiple  |     Testcase:                         
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown           
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Comment(by igloo):

 See also #2548

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1666#comment:7>
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