these 3 derivations will be built:
  /nix/store/j6w1mq8iscp9j8yfla6b43zg2qmz51xa-treefmt.toml.drv
  /nix/store/hf72gljrghz5gvzcrnv4gp5hs76245qy-treefmt.drv
  /nix/store/fj9fp377yxkjaf0c8ivrjjvnncj4wwxn-treefmt-check.drv
this path will be fetched (15.3 MiB download, 81.7 MiB unpacked):
  /nix/store/8y7qng20qjpl2c2fswngxa36v9k63qac-python3.14-mypy-2.1.0
error: Cannot build '/nix/store/fj9fp377yxkjaf0c8ivrjjvnncj4wwxn-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/sx03p9zd7k6yfgksl54n8hnc7zbgjn2b-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 1.536s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/fj9fp377yxkjaf0c8ivrjjvnncj4wwxn-treefmt-check.drv