{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
                let sp = impl_.of_trait.as_ref().map_or(item.span, |t| t.path.span);
            if let (hir::Defaultness::Default { .. }, true) = (impl_.defaultness, is_auto) {
                res = Err(tcx