these 3 derivations will be built:
  /nix/store/mgl51clhvvnqjskcnlfgzlp98fs5xi89-treefmt.toml.drv
  /nix/store/cf3lsx466jq6m6c2l7s0lwv22vi01nfj-treefmt.drv
  /nix/store/463fy7d93wnxk17hd8lb85k0h0wi71pb-treefmt-check.drv