[GHC] #4125: Template haskell rejects duplicate instances before they're spliced

[GHC]

#4125: Template haskell rejects duplicate instances before they're spliced
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  Reporter:  lilac                      |          Owner:                  
      Type:  bug                        |         Status:  closed          
  Priority:  normal                     |      Milestone:                  
 Component:  Template Haskell           |        Version:  6.12.1          
Resolution:  invalid                    |       Keywords:                  
Difficulty:                             |             Os:  Unknown/Multiple
  Testcase:                             |   Architecture:  Unknown/Multiple
   Failure:  GHC rejects valid program  |  
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Comment(by simonpj):

 See #4230 for a more global discussion

 Simon

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4125#comment:4>
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