What will be printed?

#include <iostream>

using namespace std;

const int &test() {
    static int a=3;
    return a;
}

int main() {
    test()++;
    test()++;
    cout << test() << endl;
    return 0;
}
Explanation
The code will not compile since test() returns a reference to an integer constant, to which an increment operator cannot be applied.

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