[m-dev.] debugging grades and I/O tabling

[Zoltan Somogyi]

On 19-Aug-2002, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> It would be very bad for code which compiles in the default grade to
> not compile with `--debug'.  So if we're going to make that an error in
> debug grades, I think we should make it an error in all grades.

That would be fine by me.

> But doing that would break a lot of existing code.

For small values of "break".

Most broken code can be fixed by adding an annotation. Very few foreign_procs
will have to be rewritten; for example there were none in the Mercury
implementation itself.

> What's the corresponding benefit to users?

Being able to retry past I/O actions *safely* in the debugger.

Zoltan.
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