these 3 derivations will be built:
  /nix/store/5ivnnyp1jgw9xw3v9zs01psr1b2ghc9p-treefmt.toml.drv
  /nix/store/56c1v8ilfingkzd3cs67w4m4k3mbglh1-treefmt.drv
  /nix/store/nvd5mlw12kb6v96agr4gxpq8xih2pj4l-nix-shell.drv