this derivation will be built:
  /nix/store/21iwd6kckpx0d8f7j259pbq94mfz2z3d-treefmt.toml.drv
this path will be fetched (3.9 MiB download, 9.6 MiB unpacked):
  /nix/store/jzyks4q9x8hg4c1h1nrgisrp9631hcxa-dyff-1.12.0