these 3 derivations will be built:
  /nix/store/f7c24jlyqy2jmmqz3wm9agwvnbg0agli-iets-0.1.0.drv
  /nix/store/zgc6haa2krlmf2yfr0fqg0k5qzs7w2pa-iets-conformance-adapter.drv
  /nix/store/frix1hx0y7nnjds6z7vxx7m7mi5qpsir-nix-conformance-iets.drv