these 2 derivations will be built:
  /nix/store/j2071cpv8bn3kysqvzbki1ir2lfqx6j4-flake-fmt-1.0.0.drv
  /nix/store/w5k553s2fr4kcym094l20fsa8i2lw8zb-merge-when-green-0.3.0.drv