anchor.diff:  // other rules
   statement
   :
  -  FRR VERSION REMARK_TEXT? NEWLINE
  -  | FRR DEFAULTS (DATACENTER | TRADITIONAL) NEWLINE
  -  | USERNAME word word NEWLINE
  -  | HOSTNAME word NEWLINE
  -  | NO IPV6 FORWARDING NEWLINE
  -  | s_agentx
  +  s_agentx
     | s_bgp
     | s_enable
     | s_end
     | s_interface
  +  | s_frr
  +  | s_hostname
     | s_ip
     | s_line
     | s_log
  +  | s_no
     | s_password
     | s_routemap
     | s_router_ospf
     | s_service
  +  | s_username
     | s_vrf
   ;
   
  
positive.code:   ) NEWLINE
  ;
  
  s_password
  :
    PASSWORD null_rest_of_line
  
negative.code: s_end
  :
    END NEWLINE
  ;
  
  s_frr
  :
     FRR
     (
       sf_defaults
       | sf_version
     )
  ;
  
  sf_defaults
  :
     DEFAULTS (DATACENTER | TRADITIONAL) NEWLINE
  ;
  
  sf_version
  :
     VERSION REMARK_TEXT? NEWLINE
  ;
  
  s_hostname
  :
     HOSTNAME word NEWLINE
  ;
  
  se_password
  