these 3 derivations will be built:
  /nix/store/7mjnk16frx9y1f9cpd8c0786qsfgjmxx-iets-0.1.0.drv
  /nix/store/s4d38h93451gz1gsh9k1pm5gyp0p09vl-iets-conformance-adapter.drv
  /nix/store/iahk6gnmmqqxg9nr1bffdzx6rc3wcp3r-nix-conformance-iets.drv