these 3 derivations will be built:
  /nix/store/w7h7fw9bpyb73j3981mk5gada8wfrppi-iets-0.1.0.drv
  /nix/store/jh29j06w2xhdgyy85i42xrq0axjk262v-iets-conformance-adapter.drv
  /nix/store/0d11hab6nz6q2gnnh88y41jq8azkyjzy-nix-conformance-iets.drv