these 3 derivations will be built:
  /nix/store/4a1hd0bvja8zd0hkm36m7qdbd0s96b60-source.drv
  /nix/store/p0cl8bhn2lq8p35s7p2z0m12gbn330vd-collie-1.22.1.drv
  /nix/store/bw388yfkr6h6wlxrkvzd19zkys9fbqgn-check-collie.drv