[m-rev.] for post-commit review: add an XXX about a bug in pretty_printer.m

[Zoltan Somogyi]

Does anyone happen happen to have examples of large terms that heavily use
several standard Mercury operators of different priorities and/or associativities
that I can use as test data for demonstrating the presence of this bug?
I will use synthetic data if I have to, but I would prefer real world data.

By the way, would anyone object to changing ops.m to export not just
the op_table typeclass, but the predicates implementing its methods
for the Mercury operators? With those predicates hidden, pretty_printer.m
needs to do unnecessary work every time it formats a term; those exports,
and a couple of helper predicates, could fix that.

Zoltan.
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