these 2 derivations will be built:
  /nix/store/pjl50wza4qvl3rahzr2h8d1hwdyp7myn-collie-1.23.0.drv
  /nix/store/6m3wg7zd2dsyy7mggxj5k7zjpdb65v1x-check-collie.drv