these 3 derivations will be built:
  /nix/store/1zsji2157n74npy7l1lmap0shw9yyicf-iets-0.1.0.drv
  /nix/store/01wnsv8cw72hq2zv6h4bbzhiak3vqcp9-iets-conformance-adapter.drv
  /nix/store/z7ncl20yfad3h99f7jzw28xfv4f4yks1-nix-conformance-iets.drv