these 2 derivations will be built:
  /nix/store/bs4l5hg59bqjlwpi3jqy8gd26mjwq8jd-flake-fmt-1.0.0.drv
  /nix/store/ig6yarkhr5xack9jhn9jwlj109cmz1na-merge-when-green-0.3.0.drv