[Bug c++/127489] Dependent __builtin_structured_binding_size in decltype is diagnosed before instantiation

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127489

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
__builtin_structured_binding_size is a gcc extension so it could anything
including erroring out rightaway.