Bug report

PHPStan assumes token_name can return empty string, while it can't.

Code snippet that reproduces the problem

https://phpstan.org/r/61739c2a-28bf-4a32-ac5e-f881104a5bc5#

Expected output

no error expected

Found during https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/pull/8236/files#r1788655053