[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:       
      Type:  bug                   |         Status:  new  
  Priority:  normal                |      Milestone:       
 Component:  Compiler              |        Version:  6.4.1
  Severity:  normal                |     Resolution:       
  Keywords:                        |             Os:  Linux
Difficulty:  Unknown               |   Architecture:  x86  
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Comment (by wolfgang at jeltsch.net):

 Hmm, I have to admit that I don't really understand your last sentence.
 Do you mean that one needs to be in luck in order to not have problems
 with my example code?

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