these 3 derivations will be built:
  /nix/store/j063f4qmz2mjqz6ha6swyhvyq11pxv2m-iets-0.1.0.drv
  /nix/store/lgrrs6nr9b5z15bwbvl8j4j9m0gacv3k-iets-conformance-adapter.drv
  /nix/store/9xpvn4mizivgfqsxc5vihg7ccyf4q9jc-nix-conformance-iets.drv