this derivation will be built:
  /nix/store/c9sh548z86ik1nd1p6r3sxckdcpd9zh4-treefmt-check.drv
building '/nix/store/c9sh548z86ik1nd1p6r3sxckdcpd9zh4-treefmt-check.drv'
treefmt-check> treefmt v2.6.0traversed 22 files
treefmt-check> emitted 10 files for processing
treefmt-check> formatted 10 files (0 changed) in 350ms