these 2 derivations will be built:
  /nix/store/28z9wviwrnp67kx8wfcy5s85qmdv1mpj-iets-conformance-adapter.drv
  /nix/store/mq7i89l5w0nq4x5m7z01gfwysx15mymh-nix-conformance-iets.drv