{"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"let"}]}
        let parent = assoc.container_id(cx.tcx);
        let assoc = cx.tcx.associated_item(impl_item.owner_id);
        if find_attr!(cx.tcx.get_all_attrs(parent), AttributeKind::AutomaticallyDerived(..)) {