these 2 derivations will be built:
  /nix/store/qmq38jry8gd0bnwylzpbmmszr2l0qhbm-herdr-eternal-deps-0.1.0.drv
  /nix/store/ym2h4ypncfc2ixcrvdd50bcdmghfmihm-herdr-eternal-test-0.1.0.drv