dereg_object
ec = dereg_object(&lc, 0);
ec = dereg_object(&lc, 0);
ec = dereg_object(&lc, 1);
ec = dereg_object(&lc, 0);
(ec = dereg_object(&lc, 0)) == 0) {
ec = dereg_object(&lc, 0);
ec = dereg_object(&lc, 0);
int dereg_object(lookup_ctrl_t *, int);