these 3 derivations will be built:
  /nix/store/hkcmm78c4m9690s3sf5pnpf857w0gr6r-treefmt.toml.drv
  /nix/store/kyyp01w3gfjcscxzv1pm4vi9ppva9jn2-treefmt.drv
  /nix/store/z4gbp4ivgpl6rkrk4lvj006zm3qxyqrj-treefmt-check.drv