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Question #31 Difficulty: 3

According to the C++23 standard, what is the output of this program? 

    #include <iostream>

struct X {
  X() { std::cout << "X"; }
};

struct Y {
  Y(const X &x) { std::cout << "Y"; }
  void f() { std::cout << "f"; }
};

int main() {
  Y y(X());
  y.f();
}

Hint:

Have you heard about the "most vexing parse"? Does it apply here?

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