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  • Glasgow Haskell Compiler
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  • #411
Closed
Open
Created Jul 05, 2005 by nobody@trac-nobody

panic: "Non-exhaustive patterns in function zip_ty_env"

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

The same file compiles fine with GHC 6.2.2.

Unfortunately I don't have a small example of this
behaviour. I can send you the whole library if you need
it, but it is not painless to get to this point.

It would be great if you could give me some pointers
about where the bug might lie - it uses MPTC instances,
recursive newtypes and the FFI.

thanks,
peter, peteg at unsw.edu.au
Trac metadata
Trac field Value
Version None
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution ResolvedFixed
Component Compiler (Type checker)
Test case
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