anchor.diff:    /**
      * The current file state.
      *
  -   * It maps file paths to MD5 hash of the file content.
  +   * It maps file paths to the MD5 hash of the file content.
      */
     final _fileContentHashMap = <String, String>{};
  +
  +  /**
  +   * Mapping from library URIs to the linked hash of the library.
  +   */
  +  final _linkedHashMap = <Uri, String>{};
   
     /**
      * TODO(scheglov) document and improve
  
positive.code:       }
  
        AnalysisContext analysisContext = _createAnalysisContext(libraryContext);
        analysisContext.resolveCompilationUnit2(
            libraryContext.file.source, libraryContext.file.source);
        try {
          List<AnalysisError> errors;
          try {
            errors = _logger.runTimed('Computed errors', () {
  
negative.code:    * TODO(scheglov) replace with actual [AnalysisResult] computing.
     */
    List<String> _computeAndPrintErrors(_File file) {
      // TODO(scheglov) Computing resolved unit fails for these units.
      // pkg/analyzer/lib/plugin/embedded_resolver_provider.dart
      // pkg/analyzer/lib/plugin/embedded_resolver_provider.dart
      if (file.path.endsWith(
              'pkg/analyzer/lib/plugin/embedded_resolver_provider.dart') ||
          file.path.endsWith('pkg/analyzer/lib/source/embedder.dart') ||
          file.path.endsWith('pkg/analyzer/lib/src/generated/ast.dart') ||
          file.path.endsWith('pkg/analyzer/lib/src/generated/element.dart') ||
          file.path
              .endsWith('pkg/analyzer/lib/src/generated/element_handle.dart') ||
          file.path.endsWith('pkg/analyzer/lib/src/generated/error.dart') ||
          file.path.endsWith('pkg/analyzer/lib/src/generated/scanner.dart') ||
          file.path.endsWith('pkg/analyzer/lib/src/generated/sdk_io.dart') ||
          file.path.endsWith('pkg/analyzer/lib/src/generated/visitors.dart') ||
          file.path.endsWith('pkg/analyzer/test/generated/constant_test.dart') ||
          file.path.endsWith('pkg/analyzer/test/source/embedder_test.dart')) {
        return [];
      }
  
      List<String> errorStrings = _logger.run('Compute errors $file', () {
        LibraryContext libraryContext = _createLibraryContext(file);
  
  