anchor.diff:  }
   
   void _prompt(String url) {
  -  print('Please go to the following URL and grant access:');
  -  print('  => $url');
  -  print('');
  +  stderr.writeln('Please go to the following URL and grant access:');
  +  stderr.writeln('  => $url');
  +  stderr.writeln();
   }
   
   String prettyJsonEncode(Object? object) =>
  
positive.code:       credentials = await refreshCredentials(clientId, credentials, client);
      } else {
        credentials = null;
        print('Cached credentials lack the requested scopes - doing auth!');
      }
    }
  
  
negative.code: 
    credentialsFile.writeAsStringSync(prettyJsonEncode(credentials));
  
    stderr.writeln(
      '* Credentials expire in '
      '${credentials.accessToken.expiry.difference(DateTime.now())} *',
    );
  