these 3 derivations will be built:
  /nix/store/73ak8vymsag1238m5zrac1csnar5r92v-source.drv
  /nix/store/79f5kf0a6agx6z88pfhmm2bjaibsfi22-collie-1.13.1.drv
  /nix/store/ygr08qydlr6a8r58jsm3f7sb66pnaxf2-check-collie.drv