#include <iostream>

// #txt is forced to be a double quoted string literal
#define ERR(txt) std::cerr << __FILE__ << "." << __LINE__ << ": " << #txt << std::endl

int main(int argc, char** argv)
{
  std::cout << "Hello World" << std::endl;

  ERR(error here);

  std::cout << "Hello World" << std::endl;

  return 0;
}