anchor.diff:        Platform.resolvedExecutable,
         [
           '--checked',
  -        'bin/dartdoc.dart',
  +        path.join('bin', 'dartdoc.dart'),
           '--output',
           '${sdkDocsDir.path}',
           '--sdk-docs',
  
positive.code:         '--show-progress',
        ],
        workingDirectory: cwd);
  }
  
  @Task('Serve generated SDK docs locally with dhttpd on port 8000')
  
negative.code:     tempdirsCache.memoized1(createTempSync, 'dartdoc');
  Directory get sdkDocsDir => tempdirsCache.memoized1(createTempSync, 'sdkdocs');
  Directory get flutterDir => tempdirsCache.memoized1(createTempSync, 'flutter');
  Directory get testPackage =>
      new Directory(path.joinAll(['testing', 'test_package']));
  Directory get testPackageDocsDir =>
      tempdirsCache.memoized1(createTempSync, 'test_package');
  
  /// Version of dartdoc we should use when making comparisons.
  String get dartdocOriginalBranch {
  