these 2 derivations will be built:
  /nix/store/2bi2cac0ccy0iikajpkn4lqfsh6s58xw-iets-0.1.0.drv
  /nix/store/n70wcm4hcrjkm36fpdwd9sqdjcgvjz9k-iets-diff-e2e.drv