these 4 derivations will be built:
  /nix/store/52g5spa1dnkdvzm0x86bsgf008nal9a7-python3.14-types-icalendar-6.3.2.20260223.drv
  /nix/store/11ln50rbas4vxvq8js30rxix68h8jjw5-treefmt.toml.drv
  /nix/store/3pq76g5j3av6awlnb6ngqxqdzv5qzgvc-treefmt.drv
  /nix/store/arg9mifhs1khkaq020iz0fmzgvc60s6i-treefmt-check.drv
these 5 paths will be fetched (58.8 KiB download, 211.9 KiB unpacked):
  /nix/store/pb68xrlxrg3k3a5znxlgyqwy2x4vrgwk-python3.14-types-beautifulsoup4-4.12.0.20250516
  /nix/store/aj7ahvg9nk11pf5d0adr1m973k1l78jk-python3.14-types-html5lib-1.1.11.20260518
  /nix/store/rnq5i6rj82czjm26m0kasd48pcz7qbv0-python3.14-types-python-dateutil-2.9.0.20251115
  /nix/store/lg5ar6n5y2n8k2wimczrdrngrcr6l1vm-python3.14-types-pytz-2026.1.1.20260304
  /nix/store/8gw7izh91q1fzya61rwks9ddz6l4ndv3-python3.14-types-webencodings-0.6.0.20260827
error: Cannot build '/nix/store/arg9mifhs1khkaq020iz0fmzgvc60s6i-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/w6pa7cb2v0q5vh86py98w57id9jws44w-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 2.916s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/arg9mifhs1khkaq020iz0fmzgvc60s6i-treefmt-check.drv