these 4 derivations will be built:
  /nix/store/ppj41ycnsjikzji03b30vg69a96jqg0b-python3.14-types-icalendar-6.3.2.20260223.drv
  /nix/store/6kz5zwp7gz5fk07z9vgnzzvhql0ysg6p-treefmt.toml.drv
  /nix/store/bpckwacps5w3ick0h7wiqc91bjk00wdy-treefmt.drv
  /nix/store/hg4bil0pys3crd1dx1rs54zqq9rn18mg-treefmt-check.drv
these 5 paths will be fetched (58.8 KiB download, 211.5 KiB unpacked):
  /nix/store/b1iblwzxrpi6qf6y6l7fpmq8l4cjhfxh-python3.14-types-beautifulsoup4-4.12.0.20250516
  /nix/store/i81d4vdynz6n7pa7p5q759zi7gz2w278-python3.14-types-html5lib-1.1.11.20260518
  /nix/store/b6vxc0sc22brd9m7vsm5bw6c53rzhf6m-python3.14-types-python-dateutil-2.9.0.20251115
  /nix/store/3rxkk3qlci3z8v34a3shykimrw0b4qhk-python3.14-types-pytz-2026.1.1.20260304
  /nix/store/8ypf4nx9gv693biwl0bqdla4c6158gy0-python3.14-types-webencodings-0.5.0.20260408
error: Cannot build '/nix/store/hg4bil0pys3crd1dx1rs54zqq9rn18mg-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/dbip2qj3q4yqk4ydaf5c9jdw0b58m5a9-treefmt-check
       Last 25 log lines:
       >
       > CPY001 Missing copyright notice at top of file
       > --> calendar-cli/tests/test_cache.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> calendar-cli/tests/test_cli.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> calendar-cli/tests/test_import.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> calendar-cli/tests/test_invite.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> calendar-cli/tests/test_reply.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> calendar-cli/tests/test_store.py:1:1
       >
       > Found 23 errors.
       >
       > traversed 188 files
       > emitted 166 files for processing
       > formatted 81 files (8 changed) in 2.955s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/hg4bil0pys3crd1dx1rs54zqq9rn18mg-treefmt-check.drv