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#include <utility>
#include <string>
 
template<typename T>
void X(T&& x)
{
    auto y = std::forward(x);
}
 
int main()
{
	std::string x;
	X(x);
}

prog.cpp: In instantiation of ‘void X(T&&) [with T = std::basic_string<char>&]’:
prog.cpp:13:5:   required from here
prog.cpp:7:28: error: no matching function for call to ‘forward(std::basic_string<char>&)’
     auto y = std::forward(x);
                            ^
prog.cpp:7:28: note: candidates are:
In file included from /usr/include/c++/4.8/bits/stl_pair.h:59:0,
                 from /usr/include/c++/4.8/utility:70,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/move.h:76:5: note: template<class _Tp> constexpr _Tp&& std::forward(typename std::remove_reference<_From>::type&)
     forward(typename std::remove_reference<_Tp>::type& __t) noexcept
     ^
/usr/include/c++/4.8/bits/move.h:76:5: note:   template argument deduction/substitution failed:
prog.cpp:7:28: note:   couldn't deduce template parameter ‘_Tp’
     auto y = std::forward(x);
                            ^
In file included from /usr/include/c++/4.8/bits/stl_pair.h:59:0,
                 from /usr/include/c++/4.8/utility:70,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/move.h:87:5: note: template<class _Tp> constexpr _Tp&& std::forward(typename std::remove_reference<_From>::type&&)
     forward(typename std::remove_reference<_Tp>::type&& __t) noexcept
     ^
/usr/include/c++/4.8/bits/move.h:87:5: note:   template argument deduction/substitution failed:
prog.cpp:7:28: note:   couldn't deduce template parameter ‘_Tp’
     auto y = std::forward(x);
                            ^

Standard output is empty