anchor.diff:    HungActionsHeartbeat hungActionsHeartbeat;
   
     _SingleBuild(BuildImpl buildImpl, Set<BuildDirectory> buildDirs)
  -      : _assetGraph = buildImpl._assetGraph,
  +      : _assetGraph = buildImpl.assetGraph,
           _buildPhases = buildImpl._buildPhases,
           _buildPhasePool = List(buildImpl._buildPhases.length),
           _environment = buildImpl._environment,
  
positive.code:             : CachingAssetReader(buildDefinition.reader),
          _resolvers = options.resolvers,
          _writer = buildDefinition.writer,
          _assetGraph = buildDefinition.assetGraph,
          _resourceManager = buildDefinition.resourceManager,
          _verbose = options.verbose,
          _environment = buildDefinition.environment,
  
negative.code:   final FinalizedReader _finalizedReader;
    FinalizedReader get finalizedReader => _finalizedReader;
  
    final AssetGraph assetGraph;
  
    final BuildScriptUpdates _buildScriptUpdates;
    BuildScriptUpdates get buildScriptUpdates => _buildScriptUpdates;
  