these 3 derivations will be built:
  /nix/store/k8y6qixfnsl1vk1c81pv132c91vnsc6k-source.drv
  /nix/store/1ah219v7l35plbgp7qw5vhj93476yfsz-collie-1.27.3.drv
  /nix/store/y73i9bkkm00p5ia6sbwish64pdacvhpv-check-collie.drv