these 3 derivations will be built:
  /nix/store/qwnvk91yfkjbkjhxz1d155qx4wayvspz-source.drv
  /nix/store/4j74casap6pwvw95ragwy9d3and5ha8m-collie-1.12.1.drv
  /nix/store/h5pbknjj4c29vv64j1l8kn7hm2l0ihvk-check-collie.drv