the impossible happened

/home/frederik/arch/i386/bin/ghc -odir dist/build/../pp-web.cgi-tmp -hidir 
dist/build/../pp-web.cgi-tmp -o dist/build/../pp-web.cgi --make -i.. -O3 
-fignore-asserts -fglasgow-exts -package base-1.0 -package WASH-CGI 
../maint/webpage.hs -v
Glasgow Haskell Compiler, Version 6.4, for Haskell 98, compiled by GHC version 
5.04.3
Using package config file: /home/frederik/arch/i386/lib/ghc-6.4/package.conf
Using package config file: /home/frederik/.ghc/i386-linux-6.4/package.conf
Hsc static flags: -static
*** Chasing dependencies:
Chasing modules from: ../maint/webpage.hs
Stable modules:
*** Compiling Main             ( ../maint/webpage.hs, interpreted ):
compile: input file ../maint/webpage.hs
*** Checking old interface for Main:
Compiling Main             ( ../maint/webpage.hs, 
dist/build/../pp-web.cgi-tmp/Main.o )
*** Parser:
*** Renamer/typechecker:
/home/frederik/arch/i386/lib/WASH-CGI-1.4.37/ghc-6-4/import/CGIInternals.hi :
  Could not find module `HTMLMonadBase':
    it is not a module in the current program, or in any known package.
*** Deleting temp files
Deleting: /tmp/ghc14692.hc
Warning: deleting non-existent /tmp/ghc14692.hc
ghc-6.4: panic! (the `impossible' happened, GHC version 6.4):
        forkM Declaration for standardQuery{v}

Please report it as a compiler bug to glasgow-haskell-bugs@xxxxxxxxxxx,
or http://sourceforge.net/projects/ghc/.

-- 
http://ofb.net/~frederik/