[Bug c++/90546] [9/10 Regression] Incorrect template argument deduction for conversion functions

[ndkrempel at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90546

--- Comment #4 from Nick Krempel <ndkrempel at gmail dot com> ---
Here's one way to turn it into a test case which fails to compile:

struct Foo {};
void test(const Foo&) {}
Foo f;
struct Bar {
  template <typename T> operator T&&() = delete;
};
template<> Bar::operator const Foo&&() {
    return static_cast<Foo&&>(f);
}
int main() {
  test(Bar{});
}