these 3 derivations will be built:
  /nix/store/p1n8flz9swmnmrnk2lzwkandiccd7gz6-treefmt.toml.drv
  /nix/store/gz7iqnnfz8sfppf4lxk7fm2w958cmx70-treefmt.drv
  /nix/store/0il85zxyr5xdj93swx4845i6s4nmsj9g-treefmt-check.drv