bit_nclear
bit_nclear(bs, 2, TEST_LENGTH - 3);
bit_nclear(bs, 0, TEST_LENGTH - 1);
bit_nclear(bs, 0, TEST_LENGTH - 1);
bit_nclear(bs, 0, TEST_LENGTH - 1);
bit_nclear(bs, i, TEST_LENGTH - 1);
bit_nclear(bs, 0, TEST_LENGTH - 1);
bit_nclear(bs, 0, TEST_LENGTH - 1 - i);
bit_nclear(bs, i, i);
bit_nclear(bs, 0, TEST_LENGTH - 1);
bit_nclear(bs, 0, TEST_LENGTH - 1);
bit_nclear(bs, i++, i++);
bit_nclear(attrbits, 0, CFG_ATTR_BIT_MAX - 1);
bit_nclear(s->tabs, 0, screen_size_x(s) - 1);
bit_nclear(bits, 0, high - low);