these 2 derivations will be built:
  /nix/store/yx7a58457xgn1d69mgcjnhgxgmilpw48-iets-0.1.0.drv
  /nix/store/7573dqq6b4yx5525lp8rb1pcgnk5fr1d-iets-diff-e2e.drv