On Mon, Mar 03, 2003 at 12:20:23PM +0000, Malcolm Wallace wrote:

Daniel Parry writes:

...

When attempting to use hat[0] on a reasonably simple program that compiles fine with ghc I am faced with the following error.

$ hmake -hat quineMcCluskey.lhs hat-trans quineMcCluskey.lhs

Fail: AuxFixity.hs:92: Non-exhaustive patterns in case

This is a bug in hat-trans, which appears to be (sort of) fixed in the current CVS version. The next release of Hat is due in a couple of weeks, but if you can't wait, and would prefer not to use CVS, there is a workaround: in your program, replace uses of the constant -1 with (negate 1), excepting patterns of course.

Thanks, the debugger worked fine with (negate 1) replacing -1. I would just point out though that hat-trail will fail on systems that don't have x-term installed, with: sh: resize: command not found Fail: Command (resize -u) failed I admit most systems will have xterm installed (though mind didn't - I use rxvt exclusively ^_^), but it may be a problem that could easily be ironed out? Kind regards, Daniel -- --|------| Daniel Parry (Caius) (Compsci Part II) ddp23@cam.ac.uk |-------|-- "Let's not escape into mathematics. Let's stay with reality." [Michael Crichton] -----------------------------------------------------------------------------