anchor.diff:        // Try to load json and remove blocks.
         try {
           Map json = jsonDecode(utf8.decode(data));
  -        Map jsonModified = new Map.from(json);
  +        Map jsonModified = new Map.of(json);
           List packages = json["packages"];
           List packagesModified = new List.from(packages);
           jsonModified["packages"] = packagesModified;
  
positive.code: 
      // TODO(jensj): don't use full uris.
      print("""
  # Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
  # for details. All rights reserved. Use of this source code is governed by a
  # BSD-style license that can be found in the LICENSE.md file.
  
  
negative.code: 
      // For all dart files: Parse them as set their source as the parsed source
      // to "get around" any encoding issues when printing later.
      Map<Uri?, Uint8List?> copy = new Map.of(_fs.data);
      for (Uri? uri in _fs.data.keys) {
        if (await _shouldQuit()) break;
        String uriString = uri.toString();
  