these 3 derivations will be built:
  /nix/store/i8dfmbndiylvb6c412vs9xra7w37gcrf-treefmt.toml.drv
  /nix/store/8srrldd8mv8c7hldml5fh5syqhd3hrc6-treefmt.drv
  /nix/store/msjync91zk0qm41j19rxc91sqyxlhmn8-nix-shell.drv