[m-rev.] for review: fix expand equivalence type for special preds bug

[Fergus Henderson]

On 08-Nov-2002, Peter Ross <pro at missioncriticalit.com> wrote:
> +	% The arg_types where all the equivalence types have been expanded
> +	% out.
> +:- pred pred_info_expanded_arg_types(module_info, pred_info, list(type)).
> +:- mode pred_info_expanded_arg_types(in, in, out) is det.

The comment says that this expands all equivalence types,
but the code only expands the top-level equivalence type.
Actually, I think that is sufficient, since at this point
the only place equivalence types should occur is in the arguments
for unification/compare procedures for such types, and in those
they always occur at the type level; but there should be a comment
explaining this.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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