[m-dev.] for review: add `--debug' grade

[Tyson Dowd]

On 20-May-1998, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> Hi,
> 
> Zoltan, can you please review this one?
> 
> Estimated hours taken: 4
> 
> Add a `--debug' option for Mercury-level debugging
> using the trace-based debugger.

Boy, I sure am glad I didn't start implementing this (I was *just* about to).

The change looks good.

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