these 2 derivations will be built:
  /nix/store/y7rds5akv5a93blb43qnrpp6mwg7am5y-iets-0.1.0.drv
  /nix/store/nyhcccwy0vf7q1h6wj42wpcbf24rqxx8-iets-diff-e2e.drv