Hi,

Thank you for the patch.

I've adjusted license from bsd-4 to bsd-2 after skimming the project
source
<https://github.com/search?q=repo%3Aneogeny%2FTatSu%20BSD&type=code> and
checking which one is set in Nix as well
<https://github.com/NixOS/nixpkgs/blob/nixos-24.11/pkgs/development/python-modules/tatsu/default.nix#L38>

Pushed to master as ccc9fd93c402a251bf53b25bd92be0a856f7999d.
--
Oleg