these 2 derivations will be built:
  /nix/store/wsz6rjv7y58gynxiajnw7w624hzdjk7r-iets-0.1.0.drv
  /nix/store/13k13n82lma15xwqbjzlq6l0a5g4db8b-iets-diff-e2e.drv