expr_get_parent_stmt
stmt = expr_get_parent_stmt(expr);
stmt = expr_get_parent_stmt(last_parent);
stmt = expr_get_parent_stmt(parent);
pre_stmt = expr_get_parent_stmt(expr);
struct statement *expr_get_parent_stmt(struct expression *expr);
expr_get_parent_stmt(expr) &&
expr_get_parent_stmt(expr)->type == STMT_RETURN) {