[Hat] hat error

[Malcolm Wallace]

> 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