anchor.diff:    options = {
   
       services.autossh = {
  -
  -      enable = mkOption {
  -        type = types.bool;
  -        default = false;
  -        description = ''
  -          Whether to enable the AutoSSH, the SSH sessions manager
  -        '';
  -      };
   
         sessions = mkOption {
           type = types.listOf (types.submodule {
  
positive.code: 
    };
  }
  
  
  
negative.code: 
    ###### implementation
  
    config = mkIf (cfg.sessions != []) {
  
      systemd.services =
  
  