[GHC] #2356: GHC accepts multiple instances for the same type in different modules

[GHC]

#2356: GHC accepts multiple instances for the same type in different modules
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    Reporter:  claus             |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  low               |   Milestone:  _|_             
   Component:  Compiler          |     Version:  6.8.3           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:  #5316             |  
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Changes (by morabbin):

  * related:  => #5316


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2356#comment:15>
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