[mercury-users] rule is a reserved word?

[Lee Naish]

In message <003201beb0cc$1d75d0f0$ca354ec2 at herbrand.miscrit.be>you write:
>Just got that one a few days ago too. Appears that rule is used for some
>purpose in nu-prolog and defined in Mercury as reserved word for
>compatibility...

Its used for "pred" (type) declarations for predicates defined using
DCGs, to be compatible (more or less) with the Mycroft O'Keefe type
checker.  It implicitly declares the two extra args to be of type
list(T) (even though the extra args don't have to be lists).

	lee
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