Function clear_subvault_stack

crawl-ref/source/mapdef.cc:132–138

}

void clear_subvault_stack()
{
    env.new_subvault_names.clear();
    env.new_subvault_tags.clear();
    env.new_used_subvault_names.clear();
    env.new_used_subvault_tags.clear();
}

void map_register_flag(const string &flag)
{