this derivation will be built:
  /nix/store/nkcib2jfbcafr4vnm1hcy8lkl06n9q0k-treefmt-check.drv
bld4: building nkcib2jfbcafr4vnm1hcy8lkl06n9q0k-treefmt-check.drv
traversed 517 files
emitted 354 files for processing
formatted 354 files (0 changed) in 8.355s