[m-dev.] for review: retry across I/O

Fergus Henderson fjh at cs.mu.OZ.AU
Tue Dec 5 23:37:38 AEDT 2000

On 07-Nov-2000, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> It's also possible to write predicates that have two io__state
> arguments but both have mode `out'.  E.g.
> 	main(IO0, _IO) -->
> 		nasty_fail(IO0, IO0).
> 	:- mode nasty_fail(in, in) is erroneous.
> 	nasty_fail(_, _) :- throw("ouch").
> It should not be an error to write code which declares an io__state argument
> to have mode `any'.  For example, the following should be legal:
> 	main(IO0, _IO) -->
> 		another_nasty_fail(IO0, IO0).
> 	:- mode another_nasty_fail(in(any), in(any)) is erroneous.
> 	another_nasty_fail(_, _) :- throw("ouch").

What does your code do with these two test cases now?

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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