internal compiler error: the `impossible' happened

[asamoilov]

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

[asamoilov]

Logged In: YES 
user_id=1278724

Sorry, I attached Signal.hi instead Signal.hs
Reattaching the right file and deleting wrong.

All the best.

[asamoilov]

Logged In: YES 
user_id=1278724

Sorry, I attached Signal.hi instead Signal.hs
Reattaching the right file and deleting wrong.

All the best.

[simonpj]

Logged In: YES 
user_id=50165

Excellent bug report, thank you.   Turns out that this was a 
clerical error in a minor function, which has been in GHC for 
ages.  Fixed now, though; tc183 tests for it.

Simon