these 3 derivations will be built:
  /nix/store/4z6yqh6fw6w77rmvv1ph9mml5czr61lh-treefmt.toml.drv
  /nix/store/z3pssspqm77rwgmmm7ida92cl9i8bv3v-treefmt.drv
  /nix/store/d8a5pjryfal2g3by2nwpw9s6l1cq1k0h-treefmt-check.drv