this derivation will be built:
  /nix/store/q9fjivnc892jfpahjjn8piwjjiyzisks-treefmt-check.drv
building '/nix/store/q9fjivnc892jfpahjjn8piwjjiyzisks-treefmt-check.drv'
treefmt-check> ERRO file has changed path=nixbench/datasets/README.md prev_size=16981 prev_mod_time="2026-08-06 16:12:39 +0000 UTC" current_size=16971 current_mod_time="2026-08-06 16:12:40 +0000 UTC"
treefmt-check> traversed 168 files
treefmt-check> emitted 81 files for processing
treefmt-check> formatted 81 files (1 changed) in 490ms
treefmt-check> Error: unexpected changes detected, --fail-on-change is enabled
error: Cannot build '/nix/store/q9fjivnc892jfpahjjn8piwjjiyzisks-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/06hgg01h3iwsf5jn7xalxx4kyb55fp2l-treefmt-check
       Last 5 log lines:
       > ERRO file has changed path=nixbench/datasets/README.md prev_size=16981 prev_mod_time="2026-08-06 16:12:39 +0000 UTC" current_size=16971 current_mod_time="2026-08-06 16:12:40 +0000 UTC"
       > traversed 168 files
       > emitted 81 files for processing
       > formatted 81 files (1 changed) in 490ms
       > Error: unexpected changes detected, --fail-on-change is enabled
       For full logs, run:
         nix log /nix/store/q9fjivnc892jfpahjjn8piwjjiyzisks-treefmt-check.drv