anchor.diff:                type = with types; attrsOf (submodule { options = networkOptions; });
                 default = {};
                 description = ''
  -                Extra veth-pairs to be created for the container
  +                Extra veth-pairs to be created for the container.
                 '';
               };
   
  
positive.code:       default = false;
        description = ''
          Whether this NixOS machine is a lightweight container running
          in another NixOS system.
        '';
      };
  
  
negative.code:       type = types.bool;
        default = !config.boot.isContainer;
        description = ''
          Whether to enable support for NixOS containers. Defaults to true
          (at no cost if containers are not actually used), but only if the
          system is not itself a lightweight container of a host.
          To enable support for nested containers, this option has to be
          explicitly set to true (in the outer container).
        '';
      };
  
  