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panic compiling classes

$ ghc Bug.hs
ghc-6.4: panic! (the `impossible' happened, GHC version
6.4):
        ds_app_type Bug.Class1{tc r155} []

$ cat Bug.hs
module Bug where

class Class1 a where

class Class2 a where
  class1 :: a -> Class1
Trac metadata
Trac field Value
Version 6.4
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution ResolvedFixed
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
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