anchor.diff:    nodes = {
       node1 = { pkgs, ... }@attrs:
       let localConf = {
  -        privkpath = pkgs.writeText "priv.key" "GDiXWlMQKb379XthwX0haAbK6hTdjblllpjGX0heP00=";
  +        privk = "GDiXWlMQKb379XthwX0haAbK6hTdjblllpjGX0heP00=";
           pubk = "iRxpqj42nnY0Qz8MAQbSm7bXxXP5hkPqWYIULmvW+EE=";
           nodeId = "1";
           peerId = "2";
  
positive.code:       virtualisation.vlans = [ 1 ];
        environment.systemPackages = with pkgs; [ wireguard-tools ];
        boot.extraModulePackages = [ config.boot.kernelPackages.wireguard ];
        systemd.network = {
          enable = true;
          netdevs = {
            "90-wg0" = {
              netdevConfig = { Kind = "wireguard"; Name = "wg0"; };
              wireguardConfig = {
                PrivateKeyFile = privkpath ;
                ListenPort = 51820;
                FwMark = 42;
              };
  
negative.code: let generateNodeConf = { lib, pkgs, config, privk, pubk, peerId, nodeId, ...}: {
        imports = [ common/user-account.nix ];
        systemd.services.systemd-networkd.environment.SYSTEMD_LOG_LEVEL = "debug";
        networking.useNetworkd = true;
  