this derivation will be built:
  /nix/store/9dpccsayx7rflnrpza8q5g1nax3j74f1-treefmt-check.drv
bld4: building 9dpccsayx7rflnrpza8q5g1nax3j74f1-treefmt-check.drv
traversed 517 files
emitted 354 files for processing
formatted 354 files (0 changed) in 11.779s