anchor.diff:    /// Convert [sourcePath] into an absolute path.
     static String _normalizeSourcePath(String sourcePath) {
       return path.normalize(new File(sourcePath).absolute.path);
  -  }
  -}
  -
  -/// [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;
     }
   }
   
  
positive.code:     });
    }
  }
  
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.dart' show Packages;
  import 'package:package_config/packages_file.dart' as pkgfile show parse;
  import 'package:package_config/src/packages_impl.dart' show MapPackages;
  import 'package:path/path.dart' as path;
  import 'package:plugin/manager.dart';
  import 'package:plugin/plugin.dart';
  