this derivation will be built:
  /nix/store/n91i013piswxn2yhzdbl2pf4zh3ih09c-treefmt-check.drv
building '/nix/store/n91i013piswxn2yhzdbl2pf4zh3ih09c-treefmt-check.drv'
treefmt-check> treefmt v2.6.0traversed 17 files
treefmt-check> emitted 8 files for processing
treefmt-check> formatted 8 files (0 changed) in 61ms