YANTS is Yet Another Nix Type System.
Its code has moved to //depot/nix/yants on git.tazj.in. At this point
most of my software (unless it lives in other organisations) is no longer
developed on GitHub.
If you are looking for an issue tracker, issues and patches for my projects are tracked at depot@tazj.in (which is also the email address that you can send issues and patches to).