anchor.diff:  import "package:async_helper/async_helper.dart";
   
   import 'package:compiler/compiler.dart' as compiler;
  +import 'package:compiler/src/filenames.dart';
   
   const SOURCES = const {
     "/main.dart": """
  
positive.code:   // Find the path to sdk/ in the repo relative to this script.
    Uri libraryRoot = Uri.base.resolve('sdk/');
    Uri packageRoot = Uri.base.resolve('packages/');
    var platformDir = Uri.parse(Platform.resolvedExecutable).resolve('.');
    asyncTest(() => compiler.compile(
            entrypoint,
            libraryRoot,
  
negative.code: // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
  // for details. All rights reserved. Use of this source code is governed by a
  // BSD-style license that can be found in the LICENSE file.
  
  import "dart:async";
  import "dart:io";
  