this derivation will be built:
  /nix/store/m7wqffg3i8b181krg6qsxn3rxcsw2nma-treefmt-check.drv
bld4: waiting for another worker building m7wqffg3i8b181krg6qsxn3rxcsw2nma-treefmt-check.drv
bld4: promoted to build but no free slot, retrying elsewhere
bld4: building m7wqffg3i8b181krg6qsxn3rxcsw2nma-treefmt-check.drv
traversed 517 files
emitted 354 files for processing
formatted 354 files (0 changed) in 18.723s