get_implied_rl_var_sym
else if (!get_implied_rl_var_sym(data->left_var, vsl_to_sym(data->left_vsl), &left_rl))
else if (!get_implied_rl_var_sym(data->right_var, vsl_to_sym(data->right_vsl), &right_rl))
int get_implied_rl_var_sym(const char *var, struct symbol *sym, struct range_list **rl);