these 2 derivations will be built:
  /nix/store/3fdnzrsc9vg7f5acbp6kf1q3z8bpwn9i-generate-dependency-diagram.drv
  /nix/store/d5qf7gxs670hssfrfsiyhkqbgcvkl4yc-check-dependency-diagram.drv