anchor.diff:        }
       }
       resolvers.add(new FileUriResolver());
  -    return new SourceFactory(resolvers, packages);
  +    return new SourceFactory(resolvers);
     }
   
     /// Convert the given [sourcePath] (which may be relative to the current
  
positive.code:     });
    }
  }
  
  /// [SdkExtUriResolver] needs a Map from package name to folder. In the case
  /// that the analyzer is invoked with a --package-root option, we need to
  /// manually create this mapping. Given [packageRootPath],
  /// [_PackageRootPackageMapBuilder] creates a simple mapping from package name
  /// to full path on disk (resolving any symbolic links).
  class _PackageRootPackageMapBuilder {
    static Map<String, List<fileSystem.Folder>> buildPackageMap(
        String packageRootPath) {
      var packageRoot = new Directory(packageRootPath);
      var packages = packageRoot.listSync(followLinks: false);
      var result = new Map<String, List<fileSystem.Folder>>();
      for (var package in packages) {
        var packageName = path.basename(package.path);
        var realPath = package.resolveSymbolicLinksSync();
        result[packageName] =
            [PhysicalResourceProvider.INSTANCE.getFolder(realPath)];
      }
      return result;
    }
  }
  
negative.code: import 'package:analyzer_cli/src/options.dart';
  import 'package:dev_compiler/strong_mode.dart';
  import 'package:linter/src/plugin/linter_plugin.dart';
  import 'package:package_config/packages_file.dart' as pkgfile show parse;
  import 'package:path/path.dart' as path;
  import 'package:plugin/manager.dart';
  import 'package:plugin/plugin.dart';
  