[m-dev.] for review: fix for stack traces in -O-1

[Fergus Henderson]

On 08-Apr-1998, Tyson Dowd <trd at cs.mu.OZ.AU> wrote:
> +++ mercury_stack_trace.h	1998/04/07 09:12:14
...
> +** 	If you need more convienent calling from Mercury code, it would
> +** 	probably be best to make an impure predicate defined as using
> +** 	`:- external'.
>  */

s/as using/using/

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Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
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