Re: [Hat] hat Auxfixity.hs:92 error?

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. Regards, Malcolm