these 2 derivations will be built:
  /nix/store/jdihvci0831ic7cxb06mwvvkfxgsr29w-iets-0.1.0.drv
  /nix/store/wxm5p2iym8gvibpwkjbi69cc0p3g9n4f-iets-diff-e2e.drv