Can a member function returns a modifiable lvalue reference to an rvalue object?

I have a bit confusion about this code:

struct A
{
    A& bar()&&;
};

A& A::bar()&&
{
    std::cout << "A::bar()&&\n";
    return *this;
}

int main()
{
    A{}.bar();// called by an rvalue
}

So what I understand is that bar can be called only by a modifiable-rvalue. Until this it is OK. But how can bar return a non-constant lvalue reference to that rvalue?

• How bar() binds and returns a modifiable lvalue reference to that rvalue object?