[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:  high      |      Milestone:  6.10.1 
Component:  Compiler  |        Version:  6.8.2  
 Severity:  normal    |     Resolution:         
 Keywords:            |     Difficulty:  Unknown
 Testcase:            |   Architecture:  Unknown
       Os:  Unknown   |  
----------------------+-----------------------------------------------------
Changes (by igloo):

  * priority:  normal => high
  * difficulty:  => Unknown
  * milestone:  => 6.10.1

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2356#comment:2>
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