[m-rev.] for review: bug fix for global variables

[Mark Brown]

On 21-Dec-2004, Ralph Becket <rafe at cs.mu.OZ.AU> wrote:
> I believe the current convention is to use state variables for IO rather
> than DCGs.

Fixed.

> 
> Otherwise, that looks fine to me.

Okay, I'll go ahead and commit it.

Cheers,
Mark.

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