[GHC] #5820: defining instance in GHCi leads to duplicated instances

[GHC]

#5820: defining instance in GHCi leads to duplicated instances
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  Reporter:  guest               |          Owner:                  
      Type:  bug                 |         Status:  merge           
  Priority:  high                |      Milestone:  7.4.2           
 Component:  GHCi                |        Version:  7.4.1-rc1       
Resolution:  fixed               |       Keywords:                  
        Os:  Unknown/Multiple    |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown        |     Difficulty:  Unknown         
  Testcase:  ghci/scripts/T5820  |      Blockedby:                  
  Blocking:                      |        Related:                  
---------------------------------+------------------------------------------
Changes (by simonpj):

  * status:  closed => merge


Comment:

 If we do 7.4.3, this should probably merge.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5820#comment:6>
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