ExtUtils::ParseXS is the module that translates XS to C. There have been development releases (newest: 3.18_04) for some time now. No CPAN testers failures. But for something as low-level as this, tests can only cover so much. I've been wanting to build a full CPAN against it, but the infrastructure for that has been in maintenance for months.
Because the release contains a few important fixes, please test your XS against the new development release soon. Otherwise, I will take a bit of a risk and cut a production release.