anchor.diff:      ByteConversionSink byteSink = md5.startChunkedConversion(digestSink);
       // Add data.
       addData(byteSink);
  +    byteSink.add(const <int>[_VERSION]);
       byteSink.add(configSalt);
       // Done.
       byteSink.close();
  
positive.code: import 'package:analyzer/src/summary/summarize_elements.dart';
  import 'package:convert/convert.dart';
  import 'package:crypto/crypto.dart';
  
  /**
   * Storage for cache data.
  
negative.code:         return null;
        }
        bundle = new PackageBundle.fromBuffer(bytes);
        if (bundle.majorVersion != PackageBundleAssembler.currentMajorVersion ||
            bundle.minorVersion != PackageBundleAssembler.currentMinorVersion) {
          return null;
        }
        _bundleMap[key] = bundle;
      }
      return bundle;
  