anchor.diff:  //       # Replace "xcodebuild" with "out" on Linux, and "build" on Windows.
   //       "-pdart/xcodebuild/ReleaseIA32/packages/",
   //       "dart/pkg/compiler/samples/darttags/darttags.dart",
  -//       "dart/TAGS"
  +//       "dart/TAGS",
  +//       # Modify the following list to your preferences:
  +//       "dart/tests/try/web/incremental_compilation_update_test.dart",
  +//       "package:compiler/src/dart2js.dart",
   //     ],
   //   },
   // ]
  
positive.code:   Uri myLocation =
        handler.provider.cwd.resolveUri(Platform.script);
  
    // Get the names of public dart2js libraries.
    Iterable<String> names = LIBRARIES.keys.where(isPublicDart2jsLibrary);
  
    // Prepend "dart:" to the names.
    List<Uri> uris = names.map((String name) => Uri.parse('dart:$name')).toList();
  
    // Append dart2js itself.
    uris.add(myLocation.resolve(DART2JS));
    uris.add(myLocation.resolve(DART2JS_MIRROR));
  
    Uri libraryRoot = myLocation.resolve(SDK_ROOT);
    Uri packageRoot = Uri.base.resolve(Platform.packageRoot);
  
negative.code: import 'package:compiler/src/source_file_provider.dart';
  import 'package:compiler/src/util/uri_extras.dart';
  
  const DART2JS = 'package:compiler/src/dart2js.dart';
  const DART2JS_MIRROR = 'package:compiler/src/mirrors/dart2js_mirrors.dart';
  const SDK_ROOT = '../../../../sdk/';
  
  bool isPublicDart2jsLibrary(String name) {
  