these 3 derivations will be built:
  /nix/store/rbnhvn5493s3pinkf2i9qch7qbnxbjfj-iets-0.2.0.drv
  /nix/store/qxxraafvz07k4ja0sdgricpx347ycnrh-iets-conformance-adapter.drv
  /nix/store/0sdkyf9vawhm7xivxvbwfg1sc0ycxjdn-nix-conformance-iets.drv