[GHC] #2467: orphan instance warnings are badly behaved

[GHC]

#2467: orphan instance warnings are badly behaved
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    Reporter:  duncan            |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:  _|_             
   Component:  Compiler          |     Version:  6.8.2           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by morabbin):

 Has our thinking on orphaned instances evolved?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2467#comment:16>
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