[GHC] #810: GHC complains about missing instance in conjunction with GADTs

[GHC]

#810: GHC complains about missing instance in conjunction with GADTs
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 Reporter:  wolfgang at jeltsch.net  |          Owner:  simonpj
     Type:  bug                   |         Status:  new    
 Priority:  normal                |      Milestone:  6.8    
Component:  Compiler              |        Version:  6.4.1  
 Severity:  normal                |     Resolution:         
 Keywords:                        |     Difficulty:  Unknown
 Testcase:  gadt20                |   Architecture:  x86    
       Os:  Linux                 |  
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Changes (by igloo):

  * testcase:  => gadt20

Comment:

 This case seems fine in 6.6, but I assume the bug is being kept open for
 other, similar issues?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/810>
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