[m-rev.] for review: make the HLDS of unify/compare procs more type correct

[Fergus Henderson]

On 31-Dec-2001, Zoltan Somogyi <zs at cs.mu.OZ.AU> wrote:
> compiler/unify_proc.m:
> 	Make the headvars of unification and comparison predicates for
> 	equivalence types the right (unexpanded) type, and cast them to the
> 	expanded type before calling the unification/comparison predicate
> 	on the cast values. This should make the HLDS "more" type correct,
> 	as the expansion of the equivalence is now explicit.
> 
> 	Also introduce explicit casts into compare pred for enums (their unify
> 	preds don't need them).

That looks fine.

-- 
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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