[Bug c++/128289] GCC doesn't recognize CTAD with expression-list in overloaded idiom

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128289

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Reduced to just this:
```
template<typename... T>
struct overloaded: T... {};

void fun(auto b) {}
struct s1{};
struct s2{};
overloaded g(s1{},s2{});
```