// Never use rock stairs as the last leg of the trip, since
            // that will leave the player unable to retrace their path.
            // This does not apply if we have a destination with a specific
            // position on the target level travel wants to get to.
            if (grid_is_rock_stair(si.grid)
                && target.pos.x == -1
                && dest.id == target.id)
            {
                continue;
            }
            

            if (target.pos.x == -1 && dest.id == target.id
                    && !target_has_excludes)

            if (target.pos.x == -1
                && dest.id == target.id
                && !target_has_excludes)

                    if (cur == player_level && you.x_pos == stair.x &&
                            you.y_pos == stair.y)

                    if (cur == player_level && you.x_pos == stair.x
                        && you.y_pos == stair.y)
                    {

                    }