anchor.diff:  
   import 'dart:async';
   import 'dart:io';
  +import 'dart:mirrors';
   
   import 'package:dartdoc/dartdoc.dart';
   import 'package:dartdoc/src/logging.dart';
  
positive.code:     });
  
      group('Invoking command-line dartdoc', () {
        String dartdocPath = pathLib.join('bin', 'dartdoc.dart');
  
        test('errors cause non-zero exit when warnings are off', () async {
          expect(
  
negative.code:   group('dartdoc with generators', () {
      Directory tempDir;
      List<String> outputParam;
  
      setUpAll(() async {
        tempDir = Directory.systemTemp.createTempSync('dartdoc.test.');
        outputParam = ['--output', tempDir.path];
        DartdocOptionSet optionSet = await DartdocOptionSet.fromOptionGenerators(
  