these 3 derivations will be built:
  /nix/store/wsj3i3z58rjd0lg1v489kvnm47n3qc0w-iets-0.1.0.drv
  /nix/store/yczb5aaa2wzrq0z1cqw4bv9p2wp02pm3-iets-conformance-adapter.drv
  /nix/store/r9k8snbzpsxlh1rqzmn9k4r82w1kzhig-nix-conformance-iets.drv