{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"opaque_type_key.fold_captured_lifetime_args(infcx.tcx,"}]}
                opaque_type_key.fold_captured_lifetime_args(infcx.tcx, |region| {
            let opaque_type_key =
                    // Use the SCC representative instead of directly using `region`.