{"ast_node_type":"variable","tokens":[{"end":39,"kind":"keyword","start":0,"text":"let"}]}
        let iterator = self.alloc_expr(
            self.alloc_expr(into_iter_fn.map_or(Expr::Missing, Expr::Path), syntax_ptr);
            Expr::Call { callee: into_iter_fn_expr, args: Box::new([head]) },