this derivation will be built:
  /nix/store/qsz3pr3idhv3grsmabrzz7hpr1ff9jzb-treefmt-check.drv
bld4: building qsz3pr3idhv3grsmabrzz7hpr1ff9jzb-treefmt-check.drv
traversed 517 files
emitted 354 files for processing
formatted 354 files (0 changed) in 19.047s