these 2 derivations will be built:
  /nix/store/jix6lynndqc5sjxn9k5kpx3ss65aw25q-iets-0.1.0.drv
  /nix/store/4hrks72zb3krmznp3a2m7v3hi9rqbkig-iets-diff-e2e.drv