#include <iostream>

using namespace std;

int main()
{
    auto l = 4;
    cout<<l<<endl;
    return 0;
}

template <class T> class diag;

int main()
{
    auto l = 4;
    auto& m = l;

    diag<decltype (l)> ltype;
    diag<decltype (m)> mtype;
    return 0;
}

error C2079: 'ltype' uses undefined class 'diag<int>'
error C2079: 'mtype' uses undefined class 'diag<int &>'