anchor.diff:        };
   
         zones = mkOption {
  -        default = [];
  +        default = [ ];
           type = with types; coercedTo (listOf attrs) bindZoneCoerce (attrsOf (types.submodule bindZoneOptions));
           description = "
             List of zones we claim authority over.
  
positive.code:       slaves = mkOption {
          type = types.listOf types.str;
          description = "Addresses who may request zone transfers.";
          default = [];
        };
        extraConfig = mkOption {
          type = types.str;
  
negative.code:           "example.com" = {
              master = false;
              file = "/var/dns/example.com";
              masters = [ "192.168.0.1" ];
              slaves = [ ];
              extraConfig = "";
            };
          };
  