[GHC] #3406: 'impossible' happened while messing around with ScopedTypeVariables

[GHC]

#3406: 'impossible' happened while messing around with ScopedTypeVariables
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 Reporter:  RyanN               |          Owner:                
     Type:  bug                 |         Status:  new           
 Priority:  normal              |      Milestone:                
Component:  Compiler            |        Version:  6.10.3        
 Severity:  normal              |     Resolution:                
 Keywords:  ScopedTypeVariabes  |       Testcase:                
       Os:  Linux               |   Architecture:  x86_64 (amd64)
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Comment (by RyanN):

 P.S. I run into the same problem using 6.8.3 on Mac Os.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3406#comment:1>
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