text: #include <iostream>
  
  int fail_test(
      const std::string &testname, const std::string &source, unsigned lineno,
      const std::string &error) {
  
      std::cout << testname << std::endl << source << ":" << lineno << std::endl
          << error << std::endl << std::endl;
      return 1;
  }
  
  