these 2 derivations will be built:
  /nix/store/bgsy9ghc7z5qjj9012dzg9i24cjmwjdz-iets-0.1.0.drv
  /nix/store/khjfalkjyn5j61fvf5rwd7zvb7hv0saq-iets-diff-e2e.drv