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#include <iostream>
 
template <typename T> std::string debug_rep(const T& t)
{
	std::ostringstream ret(t);
	return ret.str();
}
 
template <typename T> std::string debug_rep2(const T& t)
{
	std::ostringstream ret;
	ret << t;
	return ret.str();
}
 
int main() {
	// your code goes here
	return 0;
}

prog.cpp: In function ‘std::__cxx11::string debug_rep(const T&)’:
prog.cpp:6:12: error: invalid use of incomplete type ‘std::ostringstream {aka class std::__cxx11::basic_ostringstream<char>}’
  return ret.str();
            ^
In file included from /usr/include/c++/6/ios:38:0,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/iosfwd:104:11: note: declaration of ‘std::ostringstream {aka class std::__cxx11::basic_ostringstream<char>}’
     class basic_ostringstream;
           ^~~~~~~~~~~~~~~~~~~
prog.cpp: In function ‘std::__cxx11::string debug_rep2(const T&)’:
prog.cpp:13:12: error: invalid use of incomplete type ‘std::ostringstream {aka class std::__cxx11::basic_ostringstream<char>}’
  return ret.str();
            ^
In file included from /usr/include/c++/6/ios:38:0,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/iosfwd:104:11: note: declaration of ‘std::ostringstream {aka class std::__cxx11::basic_ostringstream<char>}’
     class basic_ostringstream;
           ^~~~~~~~~~~~~~~~~~~

Standard output is empty