these 3 derivations will be built:
  /nix/store/j11yya3zdli53dj6l2w3hzfcsqh6lwzh-treefmt.toml.drv
  /nix/store/imdh1ff5zlaj51nzl401b2zb9nw6v9q1-treefmt.drv
  /nix/store/w14375q4434pjvi04dj0q1sqrq1p7j35-treefmt-check.drv
this path will be fetched (16.2 MiB download, 66.9 MiB unpacked):
  /nix/store/pn48p580ynnv8j1cgh44zj24qyy59nb8-python3.14-mypy-2.1.0
error: Cannot build '/nix/store/w14375q4434pjvi04dj0q1sqrq1p7j35-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/fg9rd5mfj08xg1z06z8p4jrqaijxm0ss-treefmt-check
       Last 25 log lines:
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_benchmark.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_cli.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_command.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_git_revision.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_parser.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_specs.py:1:1
       >
       > Found 17 errors.
       >
       > traversed 31 files
       > emitted 22 files for processing
       > formatted 5 files (0 changed) in 1.263s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/w14375q4434pjvi04dj0q1sqrq1p7j35-treefmt-check.drv