anchor.diff:    cfg = config.programs.ssh;
   
     yn = flag: if flag then "yes" else "no";
  +
  +  unwords = builtins.concatStringsSep " ";
   
     matchBlockModule = types.submodule ({ name, ... }: {
       options = {
  
positive.code:         description = "Specifies port number to connect on remote host.";
        };
  
        forwardX11 = mkOption {
          type = types.bool;
          default = false;
  
negative.code:           "Set timeout in seconds after which response will be requested.";
        };
  
        sendEnv = mkOption {
          type = types.listOf types.str;
          default = [];
          description = ''
            Environment variables to send from the local host to the
            server.
          '';
        };
  
        compression = mkOption {
          type = types.nullOr types.bool;
          default = null;
  