these 3 derivations will be built:
  /nix/store/559q7yfwbdk5dh5389hmq2p0vaymf2da-source.drv
  /nix/store/bj69dy77ww6p6gd7nmighpfm4pizka3w-collie-1.27.3.drv
  /nix/store/p3qv3jri4rz8irvd7qmymr7rhx7f8ibb-check-collie.drv