these 3 derivations will be built:
  /nix/store/qhyfw7wp9wxpcpkrz6jn5l6xncdpd34r-source.drv
  /nix/store/xl5fj9zgppr5fv1d40bp9gylh5sqk6il-collie-1.16.1.drv
  /nix/store/dn4jw04hzf8qyn05lwnsjqi324glc3yi-check-collie.drv