[Bug c++/67397] GCC incorrectly accepts non-type template parameter pack expansion of a parameter pack declared in the same template-parameter-list

[luigighiron at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67397

Halalaluyafail3 <luigighiron at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |luigighiron at gmail dot com

--- Comment #3 from Halalaluyafail3 <luigighiron at gmail dot com> ---
This looks very similar to CWG778. See also
https://github.com/llvm/llvm-project/issues/214757, GCC also incorrectly
accepts:

template<typename...T,T...>void foo(){}
int main(){
    foo();
}

Though I think this is also ill-formed because there is no way to deduce the
second pack, GCC does not appear to enforce that either.