vsl_to_sym
if (!vsl_to_sym(left_vsl))
if (!vsl_to_sym(right_vsl))
state = get_state_stree(pre_stree, link_id, right_name, vsl_to_sym(right_vsl));
state = get_state_stree(pre_stree, link_id, left_name, vsl_to_sym(left_vsl));
sym = vsl_to_sym(vsl);
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))