Function Can_fall_thru

src/dungeon.c:1661–1665

* Like Can_dig_down (above), but also allows falling through on the * stronghold level. Normally, the bottom level of a dungeon resists * both digging and falling. */

 * both digging and falling.
 */
boolean
Can_fall_thru(d_level *lev)
{
    return (boolean) (Can_dig_down(lev) || Is_stronghold(lev));
}

/*
 * True if one can rise up a level (e.g. cursed gain level).