for (cpt = NB_ELEM-1; cpt >=0; cpt--) {
xbt_dynar_replace(d, cpt, &cpt);
xbt_test_log("Push %d, length=%lu", cpt, xbt_dynar_length(d));
for (cpt = NB_ELEM-1; cpt >=0; cpt--) {
xbt_dynar_replace(d, cpt, &cpt);
xbt_test_log("Push %d, length=%lu", cpt, xbt_dynar_length(d));