anchor.diff:    (
       v4 = IP_ADDRESS
       | v6 = IPV6_ADDRESS
  -    | pg = VARIABLE
  +    | pg = variable
     )
     eos_rb_af_neighbor_common
   ;
  
positive.code:   (
      v4 = IP_ADDRESS
      | v6 = IPV6_ADDRESS
      | pg = VARIABLE
    )
    eos_rb_af_no_neighbor_common
  ;
  
negative.code: 
  eos_rb_vrf
  :
    VRF name = variable NEWLINE
    (
      eos_rbv_address_family
      | eos_rb_inner
  