[mercury-users] returning a term from a function? how to?

[Fergus Henderson]

On 02-May-2001, Terrence Brannon <princepawn at earthlink.net> wrote:
> question 2 - something tells me my type declaration below is
> useless... hmm. Actually, no, I take that back, because I typed add/3
> as rational,rational,rational, it is using my type definition to
> expand and type that.

The type declaration is also needed because it introduces the constructor
rational/2 which you use in the clause for main.

-- 
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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