return (curr);
}
static level_id find_deepest_explored(level_id curr)
{
    for (int i = branches[curr.branch].depth; i > 0; --i)
    {
        const level_id lid(curr.branch, i);
        if (travel_cache.find_level_info(lid))
            return (lid);
    }

        return (-1);
    case '$':

        break;
    case '$':
        lid = find_deepest_explored(lid);

    " <w>-</w>/<w>p</w>    : Change default to the branch above this one.\n";

    " <w>-</w>/<w>p</w>    : Change default to the branch above this one.\n"
    " <w>$</w>      : Change default to deepest visited level in this branch."
    "\n";