anchor.diff:      return null;
     }
   
  -  /**
  -   * Return the `pubspec.yaml` file that should be used when analyzing code in
  -   * the directory with the given [path], possibly `null`.
  -   */
  +  /// Return the `pubspec.yaml` file that should be used when analyzing code in
  +  /// the directory with the given [path], possibly `null`.
     File _findPubspecFile(String path) {
       var resource = resourceProvider.getResource(path);
       while (resource != null) {
  
positive.code:     }
    }
  
    /**
     * Find the location of the package resolution file/directory for the
     * directory at the given absolute [path].
     *
     * Checks for a `.packages` file in the [path]. If not found,
     * checks for a `packages` directory in the same directory. If still not
     * found, starts checking parent directories for `.packages` until reaching
     * the root directory.
     *
     * Return a [File] object representing a `.packages` file if one is found, a
     * [Folder] object for the `packages/` directory if that is found, or `null`
     * if neither is found.
     */
    Resource _findPackagesLocation(String path) {
      var resource = resourceProvider.getResource(path);
      while (resource != null) {
  
negative.code:     return driver;
    }
  
    /// Return an analysis options object containing the default option values.
    AnalysisOptions createDefaultOptions() {
      AnalysisOptions defaultOptions = builderOptions.defaultOptions;
      if (defaultOptions == null) {
  