these 3 derivations will be built:
  /nix/store/q2hq5q43iq3h1rj0q4pgy3n6yv0vhcx4-treefmt.toml.drv
  /nix/store/gfvj9hp88fa9gpw5mjapmghzms04vykr-treefmt.drv
  /nix/store/grps2a9bxqkivd04rb62dy4rvyf2axn2-treefmt-check.drv