{"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"std::iter::once(ty::GenericArg::from(self_ty))"}]}
            std::iter::once(ty::GenericArg::from(self_ty))
        let args = tcx.mk_args_from_iter(
                .chain(args.into_iter().skip(parent_args.len())),