Inserts the current rule into the list of rules C<@list>.
The list is expected to be ordered, in that each rule must come after all the rules that have a target that inherits or consumes the original rule's own target.
Inserts the current rule into the list of rules C<@list>.
The list is expected to be ordered, in that each rule must come after all the rules that have a target that inherits or consumes the original rule's own target.