How does RVO and rvalue returned by the function work?

To understand the way how compiler selects constructor of a class, I wrote code following:

#include <iostream>

struct Widget
{
    Widget(Widget&& w){std::cout << "Move ctor" << std::endl;}
    Widget(void){std::cout << "Default ctor" << std::endl;}
    Widget(const Widget& w){std::cout << "Copy ctor" << std::endl;}
}

Widget make_widget(void) //helper function
{
    Widget w;
    return w;
}

int main(void)
{
    Widget w(make_widget());
}

According to item 25 of Effective Modern C++, compiler treats w as to be rvalue reference because of Return Value Optimization. So I expected Widget w(make_widget()) calls move constructor. but it doesn't. Furthermove, it prints only

Default

So I have no idea which version of constructor was called. Then I also tried to return rvalue explicitly. That is, return std::move(w) . Against my expectation considering above result, it correctly called move constructor, and printed

Default
Move

It seems I'm in the maze of rvalue. Please tell me what's going on there.