pf.conf syntax error

[Jose Quinteiro]

The pf.conf man page sez:

Macros are not expanded inside quotes.
     For example,

           ext_if = "kue0"
           all_ifs = "{" $ext_if lo0 "}"


However, that following fails with a syntax error on 4.3.  On 4.2 
something like this worked:

foo = 123
bar = 456

fubar_ports = "{ $foo $bar }"

However, that does not work on 4.3 either.

Thanks,
Jose.