https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103110
--- Comment #2 from Fedor Chelnokov <fchelnokov at gmail dot com> ---
I think the program must be equivalent to
```
struct S {
operator auto() const { return 2; }
};
int main() {
S s;
[[maybe_unused]] int d = s;
}
```
and `auto` here is deduced from `return 2` and not from `template<class=void>`
