get_last_expr_from_expression_stmt
struct expression *get_last_expr_from_expression_stmt(struct expression *expr);
if (get_last_expr_from_expression_stmt(expr->left)) {
left = get_last_expr_from_expression_stmt(expr->left);
if (get_last_expr_from_expression_stmt(expr->right)) {
right = get_last_expr_from_expression_stmt(expr->right);
if (get_last_expr_from_expression_stmt(left_orig)) {
left = get_last_expr_from_expression_stmt(left_orig);
if (get_last_expr_from_expression_stmt(right_orig)) {
right = get_last_expr_from_expression_stmt(right_orig);