Why does this call the default constructor?

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萌比男神i
萌比男神i 2020-11-30 19:00
struct X
{
    X()    { std::cout << \"X()\\n\";    }
    X(int) { std::cout << \"X(int)\\n\"; }
};

const int answer = 42;

int main()
{
    X(answer);
         


        
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