splitTyConApp panic when using view patterns

Here is a sample program that makes ghci panic with the following message:

ghc: panic! (the 'impossible' happened)
  (GHC version 6.10.3 for i386-unknown-linux):
	splitTyConApp t_ag8{tv} [tau]

The code uses view patterns.

module Bug where

data F = FT String [F]
data G = GX F F | GY

spec :: F -> G
spec (FT "X"  [t1, t2]) = GX t1 t2
spec _                  = GY

walk (spec -> GX _ t2) = walk t2
walk t@(FT _ _)        = t

You can reach me at cklin@cs.pdx.edu

Trac metadata

Trac field	Value
Version	6.10.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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