these 2 derivations will be built:
  /nix/store/bfd8blq5bzb5svcys599njbbjpyj9qh3-iets-0.1.0.drv
  /nix/store/4f3nm3m8bbqg3mpr5zh49hqkl8l9j1zz-iets-diff-e2e.drv