these 2 derivations will be built:
  /nix/store/2a6qwjx1xlmj4wbmjmsp6sbjdfah53sk-iets-0.1.0.drv
  /nix/store/1xswdk4czfb8hzn6m4yvkraqqi13ndpg-iets-diff-e2e.drv