these 3 derivations will be built:
  /nix/store/0isqs9kbnc2zbl3g1wyw8hldf9q0nszh-source.drv
  /nix/store/x2n588nkj11l4xwr102xax3whhql1gd6-collie-1.25.3.drv
  /nix/store/00vjij1hnlr9l1175nln6qxiz5q60v9b-check-collie.drv