Stefan Reich
A complex program of mine fails with this message:
Fail: Maybe.fromJust: Nothing
I tried to extract more information about the error by compiling with -prof -auto-all and running the program with +RTS -xc, as advised on http://www.haskell.org/hawiki/TipsAndTricks . This yielded exactly one additional line:
This looks like the perfect situation in which to use program tracing through Hat. It will give you stack back-traces and much much more. http://haskell.org/hat/ Unfortunately, Hat is currently limited to ghc version 5.04.3 (i.e. not yet updated to cope with the 6.x series), but perhaps your program is written in sufficiently standard Haskell for this to be no problem? (Hat also works with nhc98.) Regards, Malcolm