{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
        let guar = self.dcx().emit_err(errors::BoxSyntaxRemoved { span, sugg });
        let sugg = errors::AddBoxNew { box_kw_and_lo, hi };
        Ok((span, ExprKind::Err(guar)))