these 3 derivations will be built:
  /nix/store/k9xaf76gm0801dk6ym0dp5s9n6nb4zm2-treefmt.toml.drv
  /nix/store/20f9n6pk65qjj4wds272q2lk4jsp8lld-treefmt.drv
  /nix/store/8z1chhb2r22s7ayk1849v1fq4cs5kh7k-treefmt-check.drv
this path will be fetched (15.3 MiB download, 81.3 MiB unpacked):
  /nix/store/43sjg68snlvh1983g1a7hbqjzxxznh43-python3.14-mypy-2.1.0
error: Cannot build '/nix/store/8z1chhb2r22s7ayk1849v1fq4cs5kh7k-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/znlwlsyikbawxc18vka93qc5f306fq55-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 1.779s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/8z1chhb2r22s7ayk1849v1fq4cs5kh7k-treefmt-check.drv