That is a 'warning as default error', so for at least Clang16, it is still disable-able. The Clang code owner is on a bit of a well-deserved war-path against t

That is a 'warning as default error', so for at least Clang16, it is still disable-able. The Clang code owner is on a bit of a well-deserved war-path against these, so they are likely to be completely illegal in the next version or two.