> If you turn off isomorphisms, it will only match exactly what you have 
> written.

This setting can occasionally be appropriate.


> Isomorphisms have a cost, so the provided isomorphism only converts !X to
> X == NULL when X is a pointer.  If you want to make an isomorphism that
> does something else, please feel free.

If data type information can not be taken into account for the transformation
of a source code search specification at this point, it can become interesting
to reactivate selected “isomorphism” rules on demand only after type information
is available at a later data processing step.

Regards,
Markus
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