https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110195
--- Comment #2 from jack <jack.cui2 at foxmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> Before C++20, Single{} didn't call the constructor so this behavior is
> expected.
Could you explain why it didn't call the constructor before c++20? C++ standard
rules or compiler make it this way?
Really appreciate if you could explain a bit more.
