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Question #226 Difficulty: 2

According to the C++17 standard, what is the output of this program? 

    #include <iostream>
#include <utility>

struct X {
    X() { std::cout << "1"; }
    X(X &) { std::cout << "2"; }
    X(const X &) { std::cout << "3"; }
    X(X &&) { std::cout << "4"; }
    ~X() { std::cout << "5"; }
};

struct Y {
    mutable X x;
    Y() = default;
    Y(const Y &) = default;
};

int main() {
    Y y1;
    Y y2 = std::move(y1);
}

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