these 3 derivations will be built:
  /nix/store/vl7p487y6gafhsbyzzijzx8hhf3ynyip-treefmt.toml.drv
  /nix/store/321bbq11pnfhmabrrmw3mnf7gk5909lx-treefmt.drv
  /nix/store/xdy6h58vl3b246anaip77c37w2d4i5sy-treefmt-check.drv
this path will be fetched (6.0 MiB download, 18.4 MiB unpacked):
  /nix/store/vwgbz9vm1gyxqn6z4fg1jd6va2nzfa3m-rustfmt-1.99.0