[m-rev.] for review: fix existentially quantified constructor unification

[Fergus Henderson]

On 21-Jul-2002, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> 
> Fix a bug which caused type-incorrect HLDS to be generated by mode
> analysis, which then caused a compiler abort in simplification.
> In the code below, mode analysis must treat the headvar unification
> as a construction followed by a var-var unification. If it is treated
> as a deconstruction, the argument unifications will be ill-typed.
> 
> 	:- type t ---> some [T] f(T) => enum(T). 
> 	:- pred p(t::in) is semidet.
> 	p('new f'(1)).

That change looks fine.  Thanks.

-- 
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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