these 3 derivations will be built:
  /nix/store/hispzfyz4v5bn0gsgk9f87va9b4bqqsn-iets-0.1.0.drv
  /nix/store/40b3hrgni5y5rwglm2iz6fy5nyzzkwak-iets-conformance-adapter.drv
  /nix/store/c9hqiqv7l42ydg8kqjzvsj93i3hzsgan-nix-conformance-iets.drv