these 3 derivations will be built:
  /nix/store/iqqi47c7b2jmp7jvzz6my7vwb30a791h-treefmt.toml.drv
  /nix/store/9y1n717chl35s7bhwc8m7zjh8ra1jgg4-treefmt.drv
  /nix/store/vvdiwy7x1skw7rn465kg8l7h936nc6vd-treefmt-check.drv