anchor.diff:  }
   
   Directory findDevToolsHome() {
  +  if (_DEVTOOLS_HOME != null) {
  +    return _DEVTOOLS_HOME;
  +  }
  +  
     var directory = new File.fromUri(Platform.script).parent;
     while (!new File("${directory.path}/pubspec.yaml").existsSync()) {
       if (directory == null) {
  
positive.code:     }
      directory = directory.parent;
    }
    return directory;
  }
  
  bool fileExists(String path) => new File(path).existsSync();
  
negative.code: part of devtools.util;
  
  Directory _DEVTOOLS_HOME;
  
  File file(String path, [Directory directory]) {
    var it = "";
  