[m-rev.] diff: reset contains_trace_goal if necessary

[Mark Brown]

On 08-Nov-2006, Peter Ross <pro at missioncriticalit.com> wrote:
> Imagine we have a program.
> 
> p(X) :-
>  q(X),
>  s(X).
> 
> q(X) :-
>  trace(..),
>  r(X).
> 
> Now imagine the compiler determines q(X) and r(X) don't actually need
> to be called.
> The behaviour of the program with respect to the trace goals will
> depend on whether or not inlining is done before or after unnecessary
> code removal.

According to the reference manual (last paragraph of sec 16) the call
to q/1 can be optimized away.  The presence of the trace goal in the
clause for q/1 shouldn't hinder this optimization.

Cheers,
Mark.

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