MAS_BUG_ON
MAS_BUG_ON(mas, mt != maple_arange_64);
MAS_BUG_ON(mas, pmt != maple_arange_64);
MAS_BUG_ON(mas, p_type == maple_dense);
MAS_BUG_ON(mas, p_type == maple_leaf_64);
MAS_BUG_ON(&mas, !mas_is_active(&mas));
MAS_BUG_ON(&mas, !mas_is_active(&mas));
MAS_BUG_ON(&mas, i != location - 2);
MAS_BUG_ON(&mas, mas.index != location);
MAS_BUG_ON(&mas, mas.last != location);
MAS_BUG_ON(&mas, i != next - 3);