these 3 derivations will be built:
  /nix/store/4kcbp1k2j8mph3hmarg2lnnjcg4z1yy5-iets-0.1.0.drv
  /nix/store/n1hri483hhiamac6b0a1bap928xzpflp-iets-conformance-adapter.drv
  /nix/store/gh2yam50b3wdnjwxwhnh2q8iigg6skyq-nix-conformance-iets.drv