[Bug c++/102449] template parameter with default argument is used without being verified during explicit specialization

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102449

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this is valid code as the compiler can deduce that First is int.
All compilers I have tried accept the code.