these 3 derivations will be built:
  /nix/store/7d8diarn3acm51y8d7l0c2a3gdhkq4zz-treefmt.toml.drv
  /nix/store/zi8dwb0bsjc1lk8b9v2ylmq1fly23gqp-treefmt.drv
  /nix/store/y5w2jbnxgmv9bbjgz3w036i6pys924ax-treefmt-check.drv