{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"//"}]}
        // Extend the impl's identity args with late-bound GAT vars
            smallvec::SmallVec::with_capacity(tcx.generics_of(impl_ty.def_id).own_params.len());
        let normalize_impl_ty_args = ty::GenericArgs::identity_for_item(tcx, container_id)