[GHC] #3877: XOverlappingInstances flag not working

[GHC]

#3877: XOverlappingInstances flag not working
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    Reporter:  traz161616               |        Owner:                           
        Type:  bug                      |       Status:  new                      
    Priority:  normal                   |    Milestone:  6.14.1                   
   Component:  Compiler (Type checker)  |      Version:  6.12.1                   
    Keywords:  XOverlappingInstances    |   Difficulty:                           
          Os:  Linux                    |     Testcase:                           
Architecture:  x86_64 (amd64)           |      Failure:  GHC rejects valid program
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Changes (by igloo):

  * milestone:  => 6.14.1


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3877#comment:2>
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