{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"&|fx,"}]}
                &|fx, _lane_ty, _res_lane_ty, x_lane, y_lane| {
                ret,
                    let gt = fx.bcx.ins().icmp(IntCC::UnsignedLessThan, x_lane, y_lane);