these 3 derivations will be built:
  /nix/store/qq7x7l4x275gra37vn822394vp8ps8f8-treefmt.toml.drv
  /nix/store/7wbw2fsraqmncpi18bxhwcfp3f6398f4-treefmt.drv
  /nix/store/36pggqb5130xw0z3856pv48ww5z1iifq-treefmt-check.drv
this path will be fetched (16.2 MiB download, 66.9 MiB unpacked):
  /nix/store/pn48p580ynnv8j1cgh44zj24qyy59nb8-python3.14-mypy-2.1.0
error: Cannot build '/nix/store/36pggqb5130xw0z3856pv48ww5z1iifq-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/d16v78m1jilc7i3sqwl39jmflxg2lhca-treefmt-check
       Last 25 log lines:
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_update.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_version_compare.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_version_prefix.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_version_regex_no_rev.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_version_sorting.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> tests/test_yarn_berry_missing_hashes.py:1:1
       >
       > Found 79 errors (2 fixed, 77 remaining).
       >
       > traversed 158 files
       > emitted 143 files for processing
       > formatted 66 files (0 changed) in 215ms
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/36pggqb5130xw0z3856pv48ww5z1iifq-treefmt-check.drv