these 3 derivations will be built:
  /nix/store/hjqqq49k85ydnji497zm6mrg06cwmzcp-source.drv
  /nix/store/h6pylgvjw6kj7476lqi8x051gwfv85lf-collie-1.23.2.drv
  /nix/store/zfp07blsdqxmmlhzd0pzjpdfxf6wycwg-check-collie.drv