static int verify_val_labs (struct variable **vars, size_t var_cnt);
static void erase_labels (struct variable **vars, size_t var_cnt);
static int get_label (struct lexer *, struct variable **vars, size_t var_cnt);
static int verify_val_labs (struct variable **vars, size_t var_cnt);
static void erase_labels (struct variable **vars, size_t var_cnt);
static int get_label (struct lexer *, struct variable **vars, size_t var_cnt);