these 2 derivations will be built:
  /nix/store/l8yzqrjn4a550w25jms8jn6ilf7bgvhw-iets-0.1.0.drv
  /nix/store/w0irj4839wbp1r77xdf272v2r43p4rgp-iets-diff-e2e.drv