these 2 derivations will be built:
  /nix/store/rl8l56zigc3a9k50qmw8wggi2r59gsg7-iets-conformance-adapter.drv
  /nix/store/is92w0c1avgfhzpsnb0al7y8s6x9ihcf-nix-conformance-iets.drv