trivial diff: define `int:is/2' in Mercury

[Lee Naish]

Fergus Henderson <fjh at cs.mu.OZ.AU> writes:

>	:- pragma obsolete(is/2, 
> 		"This predicate has moved to the `prolog' module.").

>However, this still wouldn't solve the problem with is/2.


Sounds like you want to issue a warning if (and preferably only if)
is/2 has an explicit module qualifier or the prolog module is not used.
The warning should be something like

"This predicate will be moved to the `prolog' module in a future release."

Getting the "only if" condition precise might require a new pragma, or
you could live with extra warnings.

	lee