[GHC] #1684: impossible happened when compiling darcs with GADTs.

[GHC]

#1684: impossible happened when compiling darcs with GADTs.
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 Reporter:  droundy at darcs.net  |          Owner:                
     Type:  bug                |         Status:  new           
 Priority:  normal             |      Milestone:  6.8.2         
Component:  Compiler           |        Version:  6.6           
 Severity:  normal             |     Resolution:                
 Keywords:                     |     Difficulty:  Unknown       
 Testcase:                     |   Architecture:  x86_64 (amd64)
       Os:  Linux              |  
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Changes (by igloo):

  * milestone:  => 6.8.2

Comment:

 Possibly related to #1646.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1684#comment:3>
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