const int mon = mgrd[x][y];
    return (mon != NON_MONSTER
            && player_monster_visible(&menv[mon])
            && mons_is_stationary(&menv[mon])
            && mons_was_seen(&menv[mon]));

    const monsters *mons = monster_at(coord_def(x, y));
    return (mons
            && player_monster_visible(mons)
            && mons_is_stationary(mons)
            && mons_was_seen(mons)
            && (!mons_is_mimic(mons->type) || mons_is_known_mimic(mons)));