these 3 derivations will be built:
  /nix/store/llia45lni5s6rp37mh7f42ad8gx02z56-treefmt.toml.drv
  /nix/store/3j4b6v86zx7nvhlnjdyzb54w0319fadr-treefmt.drv
  /nix/store/iq1bfpzawm9y0hbr5wj442a3s89iwg0j-treefmt-check.drv