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#include <iostream>
using namespace std;
 
 
 
template <class T>  //для lvalue
T&& go(T& x )
{
    return static_cast<T&&>(x);
}
 
template <class T >
T&& go(T&& x)                  //rvalue
{
    return static_cast<T&&>(x);
}
 
class Huston
{
    int a;
public:
    Huston(int& f) :a(f)
    {
 
    }
    Huston(int&& b) :a(move(b))
    {
 
    }
};
int func(int b ){ return b; }
int main()
{
 
    int b = 3;
    Huston a(go(b));//move constructor is called
    Huston c(go(2));//move constructor is called
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:36:18: error: call of overloaded ‘go(int&)’ is ambiguous
     Huston a(go(b));//move constructor is called
                  ^
prog.cpp:36:18: note: candidates are:
prog.cpp:7:5: note: T&& go(T&) [with T = int]
 T&& go(T& x )
     ^
prog.cpp:13:5: note: T&& go(T&&) [with T = int&]
 T&& go(T&& x)                  //rvalue
     ^

Standard output is empty