Isn't there a way to parse, don't load rules and complain about syntax errors or missing variables ?

[BB]

I need to move a new 5.3 firewall box in place in order to upgrade the
old system.

The pf.conf configuration file has mostly variables setup.

When I ran this command it didn't complain about anything -

pfctl -nf /tmp/pf.conf

However when I looked at the configuration file again the scrub rule
had the explicate interface name fxp0

This new box doesn't have fxp0