What Is Wrong with the Following Function Template (Other Than $\quad$

question 2

Essay

What is wrong with the following function template (Other than the fact that it really does almost nothing)?
template<class T>
int f( int & x )
{
$\quad$ return x;
}
int main()
{
$\quad$ int y = 3,z;
$\quad$ z = f(y);
}

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