How copy constructor can be called with rvalue

MWE:

struct A {
    A() {std::cout << "constructor" << std::endl; }
    A(const A& a) {std::cout << "copy constructor" << std::endl; }
    A(A&& a) {std::cout << "move constructor" << std::endl; }
};

int main() {
    A a1{};
    A a2{ a2 };
    A a3{ A{} };
    A a4{ std::move(a3) };
    return 0;
}

Output:

constructor
copy constructor
constructor
move constructor

fora2 copy elision is used which is an optimization of the compiler and everything seems to be fine. When I comment out the move constructor however, copy constructor is called in place of move constructor. How can an rvalue be converted to a const lvalue reference? Output:

constructor
copy constructor
constructor
copy constructor

The program is compiled in VS2017.