anchor.diff:  
   hsrpc_stanza
   :
  -   preempt_stanza
  -   | priority_stanza
  -   | ip_address_stanza
  +   ip_address_hsrpc_stanza
  +   | preempt_hsrpc_stanza
  +   | priority_hsprc_stanza
  +   | track_hsrpc_stanza
   ;
   
   if_stanza
  
positive.code:    ) ~NEWLINE* NEWLINE
  ;
  
  preempt_stanza
  :
     PREEMPT NEWLINE
  ;
  
  priority_stanza
  :
     PRIORITY value = DEC NEWLINE
  ;
  
negative.code:    SWITCHPORT TRUNK NATIVE VLAN vlan = DEC NEWLINE
  ;
  
  track_hsrpc_stanza
  :
     TRACK ~NEWLINE* NEWLINE
  ;
  
  vrf_forwarding_if_stanza
  :
     VRF FORWARDING name = ~NEWLINE NEWLINE
  