these 3 derivations will be built:
  /nix/store/7caf4wmb5xb5f5vr5c4v1girbbc7ang1-source.drv
  /nix/store/k1vjyrlwxc04s4wpfrny1yl69g079pd4-collie-1.21.3.drv
  /nix/store/99gwyzijjpdk81hsipm9hx1b7dqaj3s9-check-collie.drv