these 3 derivations will be built:
  /nix/store/6djl3pgvsnw31k0jzx63y61s1mvkkzxz-iets-0.2.0.drv
  /nix/store/xljjcxh1q6qna7qdn0zgmhgbajba79kz-iets-conformance-adapter.drv
  /nix/store/nlnsg0m7p5hk1wlqd5j4gxmz6cnvg884-nix-conformance-iets.drv