these 2 derivations will be built:
  /nix/store/jb0g9ln7wjw0zzpcylbr8v14siw32myb-iets-0.1.0.drv
  /nix/store/zki2v2p2m9g1jvflsrmqxg90b5zalxyn-iets-diff-e2e.drv