anchor.diff:        this._options, this._uriTranslator, this._entryPoint)
         : _logger = _options.logger,
           _fsState = new FileSystemState(_options.fileSystem, _uriTranslator),
  -        _byteStore = _options.byteStore;
  +        _byteStore = _options.byteStore {
  +    _computeSalt();
  +  }
   
     @override
     Future<DeltaProgram> computeDelta(
  
positive.code: /// used to obtain resolved ASTs, and these are fed into kernel code generation
  /// logic.
  class IncrementalKernelGeneratorImpl implements IncrementalKernelGenerator {
    /// The compiler options, such as the [FileSystem], the SDK dill location,
    /// etc.
    final ProcessedOptions _options;
  
negative.code:       for (_LibraryCycleResult result in results) {
          for (Library library in result.kernelLibraries) {
            Uri uri = library.importUri;
            if (_latestSignature[uri] != result.signature) {
              _latestSignature[uri] = result.signature;
              program.libraries.add(library);
            }
          }
  