these 2 derivations will be built:
  /nix/store/qqzjl3r43srx1vc3vz6pr1qyjsj9hv5f-iets-0.1.0.drv
  /nix/store/z62s6wawnppj5s1mgq4hy8ra4m1rmsiq-iets-partest.drv