this derivation will be built:
  /nix/store/f2k8kcv3h8yy4183w81pzz0j5vvan3ab-treefmt-check.drv
bld4: building f2k8kcv3h8yy4183w81pzz0j5vvan3ab-treefmt-check.drv
traversed 517 files
emitted 354 files for processing
formatted 354 files (0 changed) in 6.38s