[Bug c++/107450] GCC accepts invalid program involving multiple template parameter packs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107450

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced/simplified (using auto because I feel like it):
int i, j, k;
void f(auto){i++;}
void g(auto){j++;}
void h(auto){k++;}
void foo(auto&&...args1, auto&&... args2, auto&&... args3) {
    (f(args1), ...);
    (g(args2), ...);
    (h(args3), ...);
}

int main(int argc, char** argv)
{
    foo(1,2,3,4,5,6); //gcc and clang compiles this while msvc correctly
rejects this
    __builtin_printf("args1: %d, args2: %d, args3: %d.\n", i, j, k);
}