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#include <iostream>
using namespace std::placeholders;
 
int main() {
	auto f = _1 + _2;
	return f(2, 3);
}

prog.cpp:2:22: error: ‘placeholders’ is not a namespace-name
 using namespace std::placeholders;
                      ^
prog.cpp:2:34: error: expected namespace-name before ‘;’ token
 using namespace std::placeholders;
                                  ^
prog.cpp: In function ‘int main()’:
prog.cpp:5:2: warning: ‘auto’ changes meaning in C++11; please remove it [-Wc++0x-compat]
  auto f = _1 + _2;
  ^
prog.cpp:5:7: error: ‘f’ does not name a type
  auto f = _1 + _2;
       ^
prog.cpp:6:15: error: ‘f’ was not declared in this scope
  return f(2, 3);
               ^

Standard output is empty