{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
        let self_ty = tcx.type_of(def_id).instantiate_identity();
    if let Node::Item(&Item { kind: ItemKind::Impl { .. }, .. }) = node {
        let trait_ref = tcx.impl_trait_ref(def_id).map(ty::EarlyBinder::instantiate_identity);