5.10 Consulting during Debugging

It is possible, and sometimes useful, to consult a file whilst in the middle of program execution. Predicates that have been successfully executed and are subsequently redefined by a consult and are later reactivated by backtracking, will not notice the change of their definitions. In other words, it is as if every predicate, when called, creates a copy of its definition for backtracking purposes.

Send feedback on this subject.