Re: hat error

Malcolm Wallace <[email protected]> Wed, 17 Jul 2002 17:48:04 +0100

Newsgroups	gmane.comp.lang.haskell.hat
Organization	Dept of Computer Science, University of York, UK.
Message-ID	<[email protected]>

> legion:haskell> hmake -hat SimonGA
> hat-trans  SimonGA.hs
> Fail: AuxFixity.hs:92: Non-exhaustive patterns in case

I think this is due to a fragment of code like the following:

    (-1.0 <= x && x <= -0.5)

Hat's resolution of the priority and fixity of the infix operators is
being tripped up by the close conjuction of <= and - near the right of
the expression.  Until we find a fix for this, a workaround is simply to
parenthesise negative numbers, e.g.

    ((-1.0) <= x && x <= (-0.5))

Regards,
    Malcolm