these 2 derivations will be built:
  /nix/store/g9vp1z42lhf4wa7h8bpgnyhzj5dbp7n2-generate-dependency-diagram.drv
  /nix/store/xyb9mcy6yh4hpbpj3f8p8gws5k92xsnr-check-dependency-diagram.drv