Re: ghc.exe: panic! (the `impossible' happened, GHC version 6.3): urk

Greetings,

I encountered the same problem and tracked it to 
ghc/compiler/simplCore/Simplify.lhs, line 1504: 
... coreRefineTys tvs' (error "urk") ...
and
ghc/compiler/types/Unify.lhs, line 209:
... coreRefineTys ex_tvs subst@(TvSubst in_scope orig_env) ...
which performs a strict pattern match on its second argument.

On Wed, 29 Dec 2004 05:05:06 -0800, Satnam Singh <satnams@xxxxxxxxxxxxx> wrote:
>  
>  
> 
> I was trying to build GHC 6.3 for Windows and got the following error: 
> 
>   
> 
> elapsed) :ghc>> 
> 
> (cd Text/ParserCombinators/Parsec/Language_split && /c/MinGW/bin/ld -r -x -o
> ../ 
> 
> Language.o *.o); 
> 
> rm -f Text/ParserCombinators/Parsec/Perm.o; if [ ! -d
> Text/ParserCombinators/Par 
> 
> sec/Perm_split ]; then mkdir Text/ParserCombinators/Parsec/Perm_split; else
> /usr 
> 
> /bin/find Text/ParserCombinators/Parsec/Perm_split -name '*.o' -print |
> xargs rm 
> 
>  -f __rm_food; fi; 
> 
> ../../ghc/compiler/ghc-inplace -H16m -O -fglasgow-exts -ignore-package
> parsec -O 
> 
>  -Rghc-timing  -package base -split-objs    -c
> Text/ParserCombinators/Parsec/Per 
> 
> m.hs -o Text/ParserCombinators/Parsec/Perm.o  -ohi
> Text/ParserCombinators/Parsec 
> 
> /Perm.hi 
> 
> ghc.exe: panic! (the `impossible' happened, GHC version 6.3): 
> 
>         urk 
> 
>   
> 
> Please report it as a compiler bug to glasgow-haskell-bugs@xxxxxxxxxxx, 
> 
> or http://sourceforge.net/projects/ghc/. 
> 
>   
> 
> <<ghc: 29176908 bytes, 7 GCs, 1359038/2655552 avg/max bytes residency (2
> samples 
> 
> ), 16M in use, 0.01 INIT (0.00 elapsed), 0.13 MUT (0.14 elapsed), 0.05 GC
> (0.05 
> 
> elapsed) :ghc>> 
> 
> make[2]: *** [Text/ParserCombinators/Parsec/Perm.o] Error 1 
> 
> make[1]: *** [all] Error 1 
> 
> make[1]: Leaving directory `/c/src/ghc/fptools/libraries' 
> 
> make: *** [build] Error 1 
> 
> satnams-thinkpad> 
> 
>   
> 
> Which asked me to report this as a compiler bug. 
> 
>   
> 
> Cheers, 
> 
> 
>  Satnam 
> 
>   
>  ________________________________
>  
> 
> Satnam Singh
>  Microsoft
>  One Microsoft Way
>  Redmond
>  Washington 98052-6399
>  USA 
> 
> Email: satnams@xxxxxxxxxxxxx
>  Telephone: +1 425 705 8208
>  Cell: +1 408 718 2588
>  Pager:  4087182588@xxxxxxxxxxxxxx 
>  eFax: +1 815 550 4055 
> 
>   
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> 
> 
> 


-- 
Friendly,
  Lemmih