this derivation will be built:
  /nix/store/krl823d9n9yhbj6hkp4bf9jw0h47a5v5-treefmt-check.drv
bld4: building krl823d9n9yhbj6hkp4bf9jw0h47a5v5-treefmt-check.drv
traversed 517 files
emitted 354 files for processing
formatted 354 files (0 changed) in 9.9s