anchor.diff:      final SnapshotType snapshotType = SnapshotType(platform, buildMode);
       final int genSnapshotExitCode = await genSnapshot.run(
         snapshotType: snapshotType,
  +      packagesPath: packagesPath,
         additionalArgs: genSnapshotArgs,
       );
       if (genSnapshotExitCode != 0) {
  
positive.code: 
    Future<int> run({
      @required SnapshotType snapshotType,
      IOSArch iosArch,
      Iterable<String> additionalArgs = const <String>[],
    }) {
      final List<String> args = <String>[
        '--causal_async_stacks',
      ]..addAll(additionalArgs);
  
      final String snapshotterPath = getSnapshotterPath(snapshotType);
  
negative.code:     final SnapshotType snapshotType = SnapshotType(platform, buildMode);
      final int genSnapshotExitCode = await genSnapshot.run(
        snapshotType: snapshotType,
        packagesPath: packageMap.packagesPath,
        additionalArgs: genSnapshotArgs,
        iosArch: iosArch,
      );
  