anchor.diff:      pubGet();
       addWholeDirectory();
       pubGetOffline();
  -    return concat([excludeDependencies, pathDependentProjects]).toSet();
  -  }
  -}
  +    return concat(
  +            <Iterable<Project>>[excludeDependencies, pathDependentProjects])
  +        .toSet() as Set<Project>;
  +  }
  +}
  
positive.code: 
      dockerfile.cmd([]);
  
      dockerfile.workDir(
          pathHandler.targetPath(serverProject.project.installDirectory.path));
  
      final serverMain =
          p.join(serverProject.installDirectory.path, 'bin/server.dart');
  
negative.code:         ? gitRef
          : (await gitCurrentTagName(await topLevelProject.gitDir)).get();
  
      final dir = topLevelProject.installDirectory;
      final dirPath = dir.path;
  
      final targetPath = pathHandler.targetPath(dirPath);
      dockerfile.run('git',
          args: ['clone', '-q', '-b', ref, topLevelProject.gitUri, targetPath]);
      dockerfile.workDir(targetPath);
  //    dockerfile.run('git', args: ['checkout', '-q', ref]);
  
  