these 3 derivations will be built:
  /nix/store/nv2wsa5rn1cznzxw76ax5gl7x0dn07l8-source.drv
  /nix/store/gppzs543ygphdml328adjx666px02sis-collie-1.22.5.drv
  /nix/store/p9cz5dkvqyddg2wkfkchn1pfzsxgvb5h-check-collie.drv