these 2 derivations will be built:
  /nix/store/cljayikf75fddl7spnwnvni7gf24bkgq-flake-fmt-1.0.0.drv
  /nix/store/g2slgbr2w9gl304cy3zx874bhcdc4q16-merge-when-green-0.3.0.drv