[GHC] #7296: ghc-7 assumes incoherent instances without requiring language `IncoherentInstances`

[GHC]

#7296: ghc-7 assumes incoherent instances without requiring language
`IncoherentInstances`
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    Reporter:  maeder            |       Owner:                             
        Type:  bug               |      Status:  new                        
    Priority:  normal            |   Milestone:                             
   Component:  Compiler          |     Version:  7.6.1                      
    Keywords:                    |          Os:  Unknown/Multiple           
Architecture:  Unknown/Multiple  |     Failure:  GHC accepts invalid program
  Difficulty:  Unknown           |    Testcase:                             
   Blockedby:                    |    Blocking:                             
     Related:                    |  
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Comment(by maeder):

 Thanks for this analysis, it is no show stopper for us.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7296#comment:3>
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