these 3 derivations will be built:
  /nix/store/g1irh36bndbha4hm9h3cvsdgxipirf08-source.drv
  /nix/store/s6w1zmdglq6irip83dk5rq0j6aqmdcdl-collie-1.25.3.drv
  /nix/store/lqp6d1fwi7nj8byli0hcigbbx5gf474a-check-collie.drv