use versionOlder to get errors in systemupdates

modules/later/nextcloud.nix

@@ -1,5 +1,7 @@
 { config, lib, pkgs, ... }:
 
+assert lib.versionOlder lib.version "20.09";
+
 with lib;
 
 let

modules/later/syncthing.nix

@@ -1,5 +1,7 @@
 { config, lib, pkgs, ... }:
 
+assert lib.versionOlder lib.version "20.09";
+
 with lib;
 
 let
@@ -63,6 +65,7 @@ let
       ${cfg.guiAddress}/rest/system/restart
   '';
 in {
+
   ###### interface
   options = {
     test.services.syncthing = {