anchor.diff:          String sdkPath;
           // may be "xcodebuild/ReleaseIA32/dart" with "dart-sdk" sibling
           {
  -          sdkPath = new Path(exec).directoryPath.append("dart-sdk").toNativePath();
  +          sdkPath = pathos.join(pathos.dirname(exec), "dart-sdk");
             if (new Directory(sdkPath).existsSync()) {
               _properties[name] = sdkPath;
               return sdkPath;
             }
           }
           // probably be "dart-sdk/bin/dart"
  -        sdkPath = new Path(exec).directoryPath.directoryPath.toString();
  +        sdkPath = pathos.dirname(pathos.dirname(exec));
           _properties[name] = sdkPath;
           return sdkPath;
         }
  
positive.code: class JavaFile {
    static final String separator = Platform.pathSeparator;
    static final int separatorChar = Platform.pathSeparator.codeUnitAt(0);
    Path _path;
    JavaFile(String path) {
      this._path = new Path(path);
    }
    JavaFile.relative(JavaFile base, String child) {
      if (child.isEmpty) {
        this._path = base._path;
      } else {
        this._path = base._path.join(new Path(child));
      }
    }
    JavaFile.fromUri(Uri uri) : this(uri.path);
    int get hashCode => _path.hashCode;
    bool operator ==(other) {
      return other is JavaFile && other._path.toNativePath() == _path.toNativePath();
    }
    String getPath() => _path.toNativePath();
    String getName() => _path.filename;
    String getParent() {
      var result = _path.directoryPath.toNativePath();
      // "." or  "/" or  "C:\"
      if (result.length < 4) return null;
      return result;
  
negative.code:   bool isDirectory() {
      return _newDirectory().existsSync();
    }
    Uri toURI() => pathos.toUri(_path);
    String readAsStringSync() => _newFile().readAsStringSync();
    int lastModified() {
      if (!_newFile().existsSync()) return 0;
  