these 2 derivations will be built:
  /nix/store/hbhfnqzw9vnjf6gj19gpd6ix7wy0rcsa-iets-0.1.0.drv
  /nix/store/dww85kk76022g97gd4icyh4sbkgj3skd-iets-diff-e2e.drv