check_condition
add_hook(check_condition, CONDITION_HOOK);
check_condition(ls, vkisvar(lh->v.k), "syntax error");
check_condition(ls, v.v.k == VCALL, "syntax error");
check_condition(ls, fs->f->is_vararg,
int reserve_pending, check_condition, UA_condition;
check_condition = 0;
check_condition = 1;
if (check_condition &&