these 3 derivations will be built:
  /nix/store/jmrvy820r2a39sfnlqiwki7730zmqp56-treefmt.toml.drv
  /nix/store/387nd2d78jp413kikjgq90fzwyi03q4d-treefmt.drv
  /nix/store/vsp7sqs8v65vz9yszlybqgzww065l7kw-treefmt-check.drv
this path will be fetched (15.5 MiB download, 82.4 MiB unpacked):
  /nix/store/rsb9h6mqbibbs04zikcfwqzmn8cw625w-python3.14-mypy-2.3.1
error: Cannot build '/nix/store/vsp7sqs8v65vz9yszlybqgzww065l7kw-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/4g7ij06hj2z1i7g8q2bmjggdsm08v3xk-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 34.097s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/vsp7sqs8v65vz9yszlybqgzww065l7kw-treefmt-check.drv