Nah, the law can change and invalidate formerly legal clauses. So rather than trashing the whole contract because of a change in the law parties can agree in a

Nah, the law can change and invalidate formerly legal clauses. So rather than trashing the whole contract because of a change in the law parties can agree in advance to keep the old contract in place and ignore the invalidated bits. Otherwise, companies might be forced to fire employees and vendors and then re-hire them each time employment law or contract law changes.