anchor.diff:      return;
     }
     String filePath = args[0];
  +
     List<String> output = new File(filePath).readAsLinesSync();
     int failureCount = 0;
     int index = 0;
  
positive.code:   if (testsByStackTrace.isNotEmpty) {
      print('');
      print('Unique stack traces (${testsByStackTrace.length}):');
      for (String traceLine in testsByStackTrace.keys) {
        print('  $traceLine');
      }
    }
  }
  
negative.code:   List<String> keys = testsByExpectedAndActual.keys.toList();
    keys.sort();
    for (String key in keys) {
      List<TestResult> results = testsByExpectedAndActual[key];
      results.sort((first, second) => first.testName.compareTo(second.testName));
      print('$key (${results.length})');
      for (TestResult result in results) {
        if (result.message == null) {
          print('  ${result.testName}');
  