internal compiler error: the `impossible' happened

Dear Haskellers,

I've got the following error message during
compilation of the attached Signal.hs file with ghc 6.4
and 6.5.

ghc -c Signal.hs
ghc-6.4: panic! (the `impossible' happened, GHC version
6.4):
        types/Type.lhs:(1107,0)-(1108,77):
Non-exhaustive patterns in function zip_ty_env
 
 
Please report it as a compiler bug to
glasgow-haskell-bugs@haskell.org,
or http://sourceforge.net/projects/ghc/.

I spent some time stripping the file to only several
lines :)

Best regards

Trac metadata

Trac field	Value
Version	6.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	ResolvedFixed
Component	Compiler (Type checker)
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