example needed: registerUndefinedTokenParserCallback()

[therealpecus]

I am looking for a way to shim unknown tags from a loaded Twig file, while preserving internal nodes available to the parser/walker.

Are there code examples of how to use registerUndefinedTokenParserCallback()? It's rather trivial to shim with registerUndefinedFunctionCallback() and registerUndefinedFilterCallback(), but I have not found a way to skip unknown tags.

This code works for functions and filters, i.e. $env->registerUndefinedFunctionCallback(shimTwig(TwigFunction::class))

    function shimTwig(string $type) {
        return function ($name) use ($type) {
            return new $type($name);
        };
    }