these 3 derivations will be built:
  /nix/store/jksg77mkxf00hfw936j6xpivgvjw9avv-treefmt.toml.drv
  /nix/store/phdb5kidsg14k361fv3dhz9vck77fgn9-treefmt.drv
  /nix/store/k9fjsx4964wc5iljhw1xscsvhiv8xwqk-treefmt-check.drv