Arrow: No match in record selector Var.tcTyVarDetails

compile error

../../compiler/stage1/ghc-inplace -package-name arrows-0.2.1 -hide-all-packages -split-objs -i -idist/build/autogen -idist/build -i. -Idist/build -odir dist/build -hidir dist/build -package base-2.1 -O -O -fglasgow-exts -fallow-undecidable-instances -idist/build  -H16m -O -O -Rghc-timing -fgenerics -c Control/Arrow/Transformer/Automaton.hs -o dist/build/Control/Arrow/Transformer/Automaton.o  -ohi dist/build/Control/Arrow/Transformer/Automaton.hi
ghc-6.7.20070801: panic! (the 'impossible' happened)
  (GHC version 6.7.20070801 for i386-unknown-linux):
        No match in record selector Var.tcTyVarDetails

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

<<ghc: 33220744 bytes, 5 GCs, 135168/135168 avg/max bytes residency (1 samples), 17M in use, 0.00 INIT (0.00 elapsed), 0.04 MUT (0.05 elapsed), 0.02 GC (0.02 elapsed) :ghc>>
make[2]: *** [dist/build/Control/Arrow/Transformer/Automaton.o] Error 1
make[2]: Leaving directory `/home/david/repos/ghc/libraries/arrows'
make[1]: *** [make.library.arrows] Error 2
make[1]: Leaving directory `/home/david/repos/ghc/libraries'
make: *** [stage1] Error 2

uname -a

Linux wrath 2.6.21-2-686 #1 SMP Wed Jul 11 03:53:02 UTC 2007 i686 GNU/Linux

gcc -v

Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.1.3 --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --with-tune=i686 --enable-checking=release i486-linux-gnu
Thread model: posix
gcc version 4.1.3 20070629 (prerelease) (Debian 4.1.2-13)

ghc --version

The Glorious Glasgow Haskell Compilation System, version 6.7.20070731

Trac metadata

Trac field	Value
Version	6.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries (other)
Test case
Differential revisions
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Related
Blocking
CC
Operating system
Architecture