this derivation will be built:
  /nix/store/mcy9f22wqh1ifdxfxyc4iaq2z9f9w2cm-treefmt-check.drv
building '/nix/store/mcy9f22wqh1ifdxfxyc4iaq2z9f9w2cm-treefmt-check.drv'
treefmt-check> treefmt v2.4.0traversed 934 files
treefmt-check> emitted 237 files for processing
treefmt-check> formatted 237 files (0 changed) in 578ms