these 2 derivations will be built:
  /nix/store/mmfkas4c4bkhr7a2p94hw7vmpfbfwln8-iets-deps-0.2.0.drv
  /nix/store/ydgc83qffswmfma32s5fn9k91lam1v61-iets-doctest-0.2.0.drv