[m-rev.] for review: refine the mode declaration of solutions

[Fergus Henderson]

On 22-Aug-2001, Erwan Jahier <Erwan.Jahier at irisa.fr> wrote:
> 
> oops, non_empty_list for a set is a bit weird. Please ignore that, I will undo
> the change for solution_set.

OK, the other parts look 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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