these 3 derivations will be built:
  /nix/store/1qcaclnh2vhy22f9v7dv94km6grwj96h-treefmt.toml.drv
  /nix/store/3p7pxv40xw23wj0gsrkfmcdi2020livk-treefmt.drv
  /nix/store/0scrd58jzklm1yy3b1hiymdrdraajb3q-treefmt-check.drv
this path will be fetched (13.6 MiB download, 68.6 MiB unpacked):
  /nix/store/802sq8z3s7qwbh0f6z3bwyawsllyqkv4-python3.14-mypy-2.1.0
error: Cannot build '/nix/store/0scrd58jzklm1yy3b1hiymdrdraajb3q-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/j6f71xm8kvblrw09ljvji1gavcd2g8zp-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 736ms
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/0scrd58jzklm1yy3b1hiymdrdraajb3q-treefmt-check.drv