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Question #398 Difficulty: 2

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

    #include <iostream>

struct Quiz {};

void f(Quiz) { std::cout << "f1"; }
void f(Quiz &) { std::cout << "f2"; }

int main() { f(Quiz()); }

Hint:

A non-const lvalue reference cannot bind to a prvalue.

Answer:

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