Probably not repeatable, but in case someone recognises it: In the latest GHC 4.03 from CVS, compiling using ghc-4.02, and with GhcLibHcOpts=-DDEBUG -fno-prune-tydecls -O -fno-specialise, when it gets to lib/exts/Word.lhs it dies with no error message: ------------------------------------------------------------------------ ==fptools== make all --no-print-directory -r; in /local/scratch/kw217/Builds/i386-unknown-linux/fptools-4.xx-cvs-w402 /ghc/lib/exts ------------------------------------------------------------------------ ../../../ghc/driver/ghc -recomp -cpp -fglasgow-exts -fvia-C -Rghc-timing -DDEBUG -fno-prune-tydecls -O -fno-specialise -static -H12m -monly-3-regs -c Word.lhs -o Word.o -osuf o make[3]: *** [Word.o] Error 1 make[2]: *** [all] Error 1 make[1]: *** [all] Error 1 make: *** [all] Error 1 Make all failed; aborting... When I change into the appropriate directory and apply the above command with a -v added on the end to find out where it's dying, it works fine. A classic case of `it doesn't crash when I'm in the debugger' (s/debugger/verbose mode/ of course). Ideas? Thanks. --KW 8-) -- : Keith Wansbrough, MSc, BSc(Hons) (Auckland) ------------------------: : PhD Student, Computer Laboratory, University of Cambridge, England. : : (and recently of the University of Glasgow, Scotland. [><] ) : : Native of Antipodean Auckland, New Zealand: 174d47' E, 36d55' S. : : http://www.cl.cam.ac.uk/users/kw217/ mailto:[EMAIL PROTECTED] : :---------------------------------------------------------------------: