for (i = 0; i < trns->var_cnt; i++)
{
const struct variable *src_var = trns->src_vars[i];
const struct variable *dst_var = trns->dst_vars[i];
for (i = 0; i < trns->var_cnt; i++)
{
const struct variable *src_var = trns->src_vars[i];
const struct variable *dst_var = trns->dst_vars[i];