rht_entry
(!rht_is_a_nulls(pos)) && rht_entry(tpos, pos, member); \
(!rht_is_a_nulls(pos)) && rht_entry(tpos, pos, member); \
(!rht_is_a_nulls(pos)) && rht_entry(tpos, pos, member); \
for (pos = list; pos && rht_entry(tpos, pos, member); \