this derivation will be built:
  /nix/store/ky3di7kvpyr8pfdwbmi630y7xy2b71cs-treefmt-check.drv
bld4: building ky3di7kvpyr8pfdwbmi630y7xy2b71cs-treefmt-check.drv
traversed 517 files
emitted 354 files for processing
formatted 354 files (0 changed) in 18.048s