{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
            let (mask_lane_count, _mask_lane_ty) = mask.layout().ty.simd_size_and_type(fx.tcx);
            let (val_lane_count, val_lane_ty) = val.layout().ty.simd_size_and_type(fx.tcx);
            assert_eq!(val_lane_count, mask_lane_count);