[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
---------------------------------+------------------------------------------
    Reporter:  claus             |        Owner:              
        Type:  bug               |       Status:  new         
    Priority:  low               |    Milestone:  _|_         
   Component:  Compiler          |      Version:  6.8.3       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:  Unknown     
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------
Changes (by igloo):

  * failure:  => None/Unknown


Comment:

 See #5316 for a related issue.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2356#comment:14>
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