cnst_list = &(sys->active_constraint_set);
XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
xbt_swag_foreach(_cnst, cnst_list) {
cnst_list = &(sys->active_constraint_set);
XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
xbt_swag_foreach(_cnst, cnst_list) {