anchor.diff:      [seed = 0]
       [mutations per iteration = 2]
       [iterations = 5]
  -    [name of command to test = ALL]''');
  +    [name of command to test = ALL]
  +    [dump server communications = false]''');
   
       io.exit(1);
     }
  
positive.code: }
  
  Future<num> testFormat(String src) async {
    Stopwatch sw = new Stopwatch()..start();
    await server.formatGet(source: src, offset: 0);
    return sw.elapsedMilliseconds;
  }
  
  
negative.code:   if (args.length >= 3) maxMutations = int.parse(args[2]);
    if (args.length >= 4) iterations = int.parse(args[3]);
    if (args.length >= 5) commandToRun = args[4];
    if (args.length >= 6) dumpServerComms = args[5].toLowerCase() == "true";
    io.Directory sdkDir = cli_util.getSdkDir([]);
  
    // Load the list of files.
  