this derivation will be built:
  /nix/store/rbw4yqcc74aj50i5alc9mdwkw4qvnlh6-treefmt-check.drv
bld4: building rbw4yqcc74aj50i5alc9mdwkw4qvnlh6-treefmt-check.drv
traversed 517 files
emitted 354 files for processing
formatted 354 files (0 changed) in 5.695s