these 3 derivations will be built:
  /nix/store/mdi91fgyb251znyymac08f54aw8q0gsf-iets-0.1.0.drv
  /nix/store/qhf0gwksyiaxsfnvwjfmqrb7wka781lj-iets-conformance-adapter.drv
  /nix/store/qgb4058s2hxs8w703n6sslbz6lnsx56j-nix-conformance-iets.drv