these 3 derivations will be built:
  /nix/store/7x39zwibxmlg05aip53x72wrgc4b19ns-treefmt.toml.drv
  /nix/store/la8ibs560f2m0smh2hzc2drkqhi8bzyk-treefmt.drv
  /nix/store/ik8kys9bjg3vda8ysrhskdpxpqs9ykqr-treefmt-check.drv
this path will be fetched (13.8 MiB download, 69.6 MiB unpacked):
  /nix/store/7vqdb1lf3y2f0c19axcffb2hpvi4jndc-python3.14-mypy-2.3.1
error: Cannot build '/nix/store/ik8kys9bjg3vda8ysrhskdpxpqs9ykqr-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/qp1glzwhggh837n87qzb6fpqcp4iv0w1-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 16.58s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/ik8kys9bjg3vda8ysrhskdpxpqs9ykqr-treefmt-check.drv