these 2 derivations will be built:
  /nix/store/6l907b5ld1axhzrkp4l1fahczsl2aiwg-flake-fmt-1.0.0.drv
  /nix/store/hzvfask2drsfad7rl2bz0s4lrikqfrc8-merge-when-green-0.3.0.drv