{"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
                let a_lane0 = a.value_lane(fx, out_lane_idx * 2).load_scalar(fx);
            for out_lane_idx in 0..lane_count / 2 {
                let a_lane0 = fx.bcx.ins().sextend(types::I32, a_lane0);