these 2 derivations will be built:
  /nix/store/znwpdzqazhrc86q8z5yiklh5mmq6myzg-iets-0.1.0.drv
  /nix/store/sdq7jd2c0khqnzxwrzvnfbdj80v8wzih-iets-diff-e2e.drv