{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
            let impl_def_id = tcx.local_parent(parent);
        hir::OpaqueTyOrigin::TyAlias { parent, in_assoc_ty: true } => {
            for assoc in tcx.associated_items(impl_def_id).in_definition_order() {