these 3 derivations will be built:
  /nix/store/5xbwa78w3xk26arlacsb81jp918j0hid-source.drv
  /nix/store/bxf4kby3w6l46m46hgqsjfjsmhk31wss-collie-1.18.0.drv
  /nix/store/5vqaxyc33lbzchm8684hb01c86ap685j-check-collie.drv