C++ code by Nameless - 10 lines

Link:

Nameless - C++, pasted on Mar 21:

#include <iostream>

int main()
{
   int foo(const int n)
   {
      return n+2;
   }
   return 0;
}

Output:

1
2
3

In function 'int main()':
Line 6: error: a function-definition is not allowed here before '{' token
compilation terminated due to -Wfatal-errors.