[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:  simonpj                    
        Type:  bug                      |      Status:  new                        
    Priority:  normal                   |   Milestone:  7.8.1                      
   Component:  Compiler (Type checker)  |     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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Changes (by igloo):

  * owner:  => simonpj
  * component:  Compiler => Compiler (Type checker)
  * milestone:  => 7.8.1


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7296#comment:4>
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