these 2 derivations will be built:
  /nix/store/24kdfx1s2lyiqqimz9vjv91hgrdf0rmc-flake-fmt-1.0.0.drv
  /nix/store/01li4z2la3kqs888qhbbzmj2f9qmyd2l-merge-when-green-0.3.0.drv