[GHC] #1646: : panic! (the 'impossible' happened)

[GHC]

#1646: : panic! (the 'impossible' happened)
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 Reporter:  guest     |          Owner:         
     Type:  bug       |         Status:  new    
 Priority:  normal    |      Milestone:  6.8.2  
Component:  Compiler  |        Version:  6.6.1  
 Severity:  normal    |     Resolution:         
 Keywords:            |     Difficulty:  Unknown
 Testcase:            |   Architecture:  Unknown
       Os:  Windows   |  
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Comment (by igloo):

 Possibly related to #1684.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1646#comment:3>
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