}

	// Clear and repopulate
	for k := range foundDirs {
		delete(foundDirs, k)
	}

	// Populate into map
	for _, k := range dirs {
		foundDirs[k] = struct{}{}
	}

	// Delete all directories we expect to be there.
	for _, dir := range wantDirs {
		delete(foundDirs, dir)
	}

	// Nothing to delete
	if len(foundDirs) == 0 {
		return nil
	}