[m-rev.] for review: support different clauses for different modes

[Fergus Henderson]

On 16-May-2001, Thomas Conway <conway at cs.mu.OZ.AU> wrote:
> On Wed, May 16, 2001 at 06:17:58AM EST, Fergus Henderson wrote:
> > Add support for using different clauses for different modes of a
> > predicate or function, using mode annotations on the clauses.
> 
> The implementation of func univ/1 should probably be changed to
> use this rather than var/1.

Yes, indeed; but to avoid bootstrapping problems, not straight away.

Other code that should also be changed to take advantage of this new
feature:
	- the implementation of try, try_io, try_store, and try_all
	  in library/exception.m
	- the code for freeze/2, freeze/3, and for the var/1 constructor
	  function in library/var.m

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
                                    |  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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