{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
                    let res = Res::NonMacroAttr(NonMacroAttrKind::Builtin(builtin_attr.name));
                .map(|builtin_attr| {
                    let binding = arenas.new_pub_res_binding(res, DUMMY_SP, LocalExpnId::ROOT);