else if (n->type == OP_LAG_Vnn || n->type == OP_LAG_Vsn)
{
int n_before;
assert (n->composite.arg_cnt == 2);
assert (n->composite.args[1]->type == OP_pos_int);
n_before = n->composite.args[1]->integer.i;
else if (n->type == OP_LAG_Vnn || n->type == OP_LAG_Vsn)
{
int n_before;
assert (n->composite.arg_cnt == 2);
assert (n->composite.args[1]->type == OP_pos_int);
n_before = n->composite.args[1]->integer.i;