these 3 derivations will be built:
  /nix/store/9k4xdwhixsasa0ww2ih7p3y9zv2s0mci-source.drv
  /nix/store/d2bkcqwvknhwcy4iysqv3qywgdp2fndv-collie-1.13.3.drv
  /nix/store/7dgj21s72nqm5jm3imjndyk8dhrb5kvi-check-collie.drv