anchor.diff:    final validationResult = ValidationResult(
         Uri.file(opts.absolutePath
             ? task.filename
  -          : path.relative(task.filename, from: _cwd)),
  +          : p.relative(task.filename, from: _cwd)),
         context,
         readerResult,
         writeTimestamp: opts.writeTimestamp);
  
positive.code: import 'package:gltf/src/utils.dart';
  import 'package:isolate/load_balancer.dart';
  import 'package:isolate/isolate_runner.dart';
  import 'package:path/path.dart' as path;
  import 'package:yaml/yaml.dart';
  
  const int kErrorCode = 1;
  
negative.code:   final reader = GltfReader.filename(file.openRead(), task.filename, context);
  
    if (reader == null) {
      final ext = p.extension(task.filename).toLowerCase();
      errPipe.write('Error while loading ${file.path}...\n'
          'Unknown file extension `$ext`.\n');
      watch.stop();
  