these 3 derivations will be built:
  /nix/store/xcdpb2jz6rnqzpdzwivd2sjg6dqkrl3h-source.drv
  /nix/store/7hy396glwi2lnmf15mlm04w2m9hjpqmz-collie-1.23.0.drv
  /nix/store/0cf1s5syl2va4kx0vc3g3py0nr1mj3mz-check-collie.drv