anchor.diff:  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';
  
positive.code:     });
    }
  }
  
negative.code:   /// Convert [sourcePath] into an absolute path.
    static String _normalizeSourcePath(String sourcePath) {
      return path.normalize(new File(sourcePath).absolute.path);
    }
  }
  
  