these 2 derivations will be built:
  /nix/store/5z8v847avvh80bh1a94dr6i8ljrb8s9b-flake-fmt-1.0.0.drv
  /nix/store/2warkzsanq7f66gzs306nlhxjwk5nm6y-merge-when-green-0.3.0.drv