Hi,
Apologies for the sloppiness of this bug report.
in ghc 5.04.2 I get this message:
ghc-5.04.2: panic! (the `impossible' happened, GHC version 5.04.2):
coreSyn/Subst.lhs:385: Non-exhaustive patterns in function zip_ty_env
I would love to try and give you a simple test case, but I can't. It happens
when I am building a (buddha-transformed) raytracer which I am also trying
to profile (there is a lot of code involved - and it is mangled because of
the debugging transformation, so finding a simplified expression of the
bug is somewhat tricky).
The bug disappears if I re-compile all my code from scratch.
In any case the code for zip_ty_env is simple enough that someone who
understands it may want to consider its assumptions:
zip_ty_env [] [] env = env
zip_ty_env (tv:tvs) (ty:tys) env = ....
Obviously one of the lists is empty and the other is not - though the code
assumes this will never happen.
Cheers,
Bernie.
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