it would give something like:

modules = [
   { ... }: {
      nix.package = pkgs.lixPackageSets.stable.lix;
   }
 ];
}

Nov 02 21:58:54 cedarix cage[1126]: could not connect to wayland server
Nov 02 21:58:54 cedarix cage[1126]: (EE)
Nov 02 21:58:54 cedarix cage[1126]: Fatal server error:
Nov 02 21:58:54 cedarix cage[1126]: (EE) Couldn't add screen
Nov 02 21:58:54 cedarix cage[1126]: (EE)
Nov 02 21:58:54 cedarix seatd[678]: 00:00:13.326 [INFO] [seatd/client.c:496] Client disconnected
Nov 02 21:58:54 cedarix seatd[678]: 00:00:13.455 [INFO] [seatd/seat.c:158] No clients on seat0 to activate
Nov 02 21:58:54 cedarix seatd[678]: 00:00:13.455 [INFO] [seatd/seat.c:290] Removed client 1 from seat0
Nov 02 21:58:53 cedarix systemd[1]: systemd-coredump@0-1-1150_1450-0.service: Consumed 880ms CPU time, 54.2M memory peak, 9M read from disk, 2.1M written to disk.
Nov 02 21:58:53 cedarix systemd[1]: cage-tty1.service: Main process exited, code=dumped, status=6/ABRT
Nov 02 21:58:53 cedarix systemd[1]: cage-tty1.service: Failed with result 'core-dump'.
Nov 02 21:58:53 cedarix systemd[1]: cage-tty1.service: Consumed 59ms CPU time, 5.3M memory peak, 3.1M read from disk.
Nov 02 21:58:53 cedarix systemd-logind[714]: Session c1 logged out. Waiting for processes to exit.
Nov 02 21:58:53 cedarix systemd-coredump[1157]: Process 1126 (Xwayland) of user 982 terminated abnormally with signal 6/ABRT, processing...
Nov 02 21:58:53 cedarix systemd[1]: Started Process Core Dump (PID 1157/UID 0).
Nov 02 21:58:53 cedarix systemd-timesyncd[426]: Contacted time server 195.148.70.12:123 (0.nixos.pool.ntp.org).
Nov 02 21:58:54 cedarix systemd-coredump[1160]: Process 1126 (Xwayland) of user 982 dumped core.
                                                
                                                Module /nix/store/ci85l25770d1gxxf99p6yf390wk2hxj8-xwayland-24.1.9/bin/Xwayland without build-id.
                                                Module libpciaccess.so.0 without build-id.
                                                Module libxml2.so.16 without build-id.
                                                Module libgcc_s.so.1 without build-id.
                                                Module libstdc++.so.6 without build-id.
                                                Module libdrm_intel.so.1 without build-id.
                                                Module libdrm_amdgpu.so.1 without build-id.
                                                Module libxcb-sync.so.1 without build-id.
                                                Module libsensors.so.5 without build-id.
                                                Module libzstd.so.1 without build-id.
                                                Module libxcb-present.so.0 without build-id.
                                                Module libxcb-dri3.so.0 without build-id.
                                                Module libxcb-shm.so.0 without build-id.
                                                Module libxcb-xfixes.so.0 without build-id.
                                                Module libxcb-randr.so.0 without build-id.
                                                Module libX11-xcb.so.1 without build-id.
                                                Module libexpat.so.1 without build-id.
                                                Module libEGL.so.1 without build-id.
                                                Module libxcb.so.1 without build-id.
                                                Module libkeyutils.so.1 without build-id.
                                                Module libkrb5support.so.0 without build-id.
                                                Module libcap.so.2 without build-id.
                                                Module libbrotlicommon.so.1 without build-id.
                                                Module libGLdispatch.so.0 without build-id.
                                                Module libXext.so.6 without build-id.
                                                Module libX11.so.6 without build-id.
                                                Module libGLX.so.0 without build-id.
                                                Module libcom_err.so.3 without build-id.
                                                Module libk5crypto.so.3 without build-id.
                                                Module libkrb5.so.3 without build-id.
                                                Module libgssapi_krb5.so.2 without build-id.
                                                Module libffi.so.8 without build-id.
                                                Module liblzma.so.5 without build-id.
                                                Module libbrotlidec.so.1 without build-id.
                                                Module libpng16.so.16 without build-id.
                                                Module libbz2.so.1 without build-id.
                                                Module libz.so.1 without build-id.
                                                Module libfreetype.so.6 without build-id.
                                                Module libfontenc.so.1 without build-id.
                                                Module libGL.so.1 without build-id.
                                                Module libXau.so.6 without build-id.
                                                Module libtirpc.so.3 without build-id.
                                                Module libdecor-0.so.0 without build-id.
                                                Module libgbm.so.1 without build-id.
                                                Module liboeffis.so.1 without build-id.
                                                Module libei.so.1 without build-id.
                                                Module libepoxy.so.0 without build-id.
                                                Module libdrm.so.2 without build-id.
                                                Module libxshmfence.so.1 without build-id.
                                                Module libxcvt.so.0 without build-id.
                                                Module libunwind.so.8 without build-id.
                                                Module libXdmcp.so.6 without build-id.
                                                Module libXfont2.so.2 without build-id.
                                                Stack trace of thread 1126:
                                                #0  0x0000007f9a182134 __pthread_kill_implementation (libc.so.6 + 0x92134)
                                                #1  0x0000007f9a12bb1c raise (libc.so.6 + 0x3bb1c)
                                                #2  0x0000007f9a115a00 abort (libc.so.6 + 0x25a00)
                                                #3  0x000000556f90dd08 OsAbort (/nix/store/ci85l25770d1gxxf99p6yf390wk2hxj8-xwayland-24.1.9/bin/Xwayland + 0x1add08)
                                                #4  0x000000556f91384c AbortServer (/nix/store/ci85l25770d1gxxf99p6yf390wk2hxj8-xwayland-24.1.9/bin/Xwayland + 0x1b384c)
                                                #5  0x000000556f9148f4 FatalError (/nix/store/ci85l25770d1gxxf99p6yf390wk2hxj8-xwayland-24.1.9/bin/Xwayland + 0x1b48f4)
                                                #6  0x000000556f7a54ec InitOutput (/nix/store/ci85l25770d1gxxf99p6yf390wk2hxj8-xwayland-24.1.9/bin/Xwayland + 0x454ec)
                                                #7  0x000000556f82805c dix_main (/nix/store/ci85l25770d1gxxf99p6yf390wk2hxj8-xwayland-24.1.9/bin/Xwayland + 0xc805c)
                                                #8  0x0000007f9a1162b4 __libc_start_call_main (libc.so.6 + 0x262b4)
                                                #9  0x0000007f9a116398 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x26398)
                                                #10 0x000000556f7a4730 _start (/nix/store/ci85l25770d1gxxf99p6yf390wk2hxj8-xwayland-24.1.9/bin/Xwayland + 0x44730)
                                                
                                                Stack trace of thread 1135:
                                                #0  0x0000007f9a17c520 __GI___futex_abstimed_wait_cancelable64 (libc.so.6 + 0x8c520)
                                                #1  0x0000007f9a17f5dc pthread_cond_wait@@GLIBC_2.17 (libc.so.6 + 0x8f5dc)
                                                #2  0x0000007f9688fb4c cnd_wait (libgallium-25.2.5.so + 0x5ffb4c)
                                                #3  0x0000007f968654ec util_queue_thread_func (libgallium-25.2.5.so + 0x5d54ec)
                                                #4  0x0000007f9688f9bc impl_thrd_routine (libgallium-25.2.5.so + 0x5ff9bc)
                                                #5  0x0000007f9a1801ec start_thread (libc.so.6 + 0x901ec)
                                                #6  0x0000007f9a1f034c thread_start (libc.so.6 + 0x10034c)
                                                ELF object binary architecture: AARCH64
Nov 02 21:58:54 cedarix systemd[1]: systemd-coredump@1-4097-1157_1457-0.service: Deactivated successfully.
Nov 02 21:58:54 cedarix systemd[1]: systemd-coredump@1-4097-1157_1457-0.service: Consumed 725ms CPU time, 41.2M memory peak, 968K read from disk, 2.2M written to disk.
Nov 02 21:58:54 cedarix moonraker-start[929]: [file_manager.py:complete_file_write()] - Invalid file write event: index
Nov 02 21:58:56 cedarix systemd[1]: session-c1.scope: Deactivated successfully.
Nov 02 21:58:56 cedarix systemd[1]: session-c1.scope: Consumed 4.446s CPU time, 204.3M memory peak, 117.6M read from disk, 16K written to disk, 275.6K incoming IP traffic, 8.2K outgoing IP traffic.
Nov 02 21:58:56 cedarix systemd-logind[714]: Removed session c1.

wlr_xdg_surface_schedule_configure: Assertion surface->initialized failed

like

kmscube and fbtest work