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#include <iostream>
using namespace std;
 
int main() {
	string str ("Test string");
	for (int index = 0, auto it = str.begin(); it < str.end(); ++it, ++index)
		cout << index << *it;
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:6:22: error: expected unqualified-id before ‘auto’
  for (int index = 0, auto it = str.begin(); it < str.end(); ++it, ++index)
                      ^~~~
prog.cpp:6:22: error: expected ‘;’ before ‘auto’
prog.cpp:6:42: error: could not convert ‘it’ from ‘__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >’ to ‘bool’
  for (int index = 0, auto it = str.begin(); it < str.end(); ++it, ++index)
                                          ^
prog.cpp:6:59: error: expected ‘)’ before ‘;’ token
  for (int index = 0, auto it = str.begin(); it < str.end(); ++it, ++index)
                                                           ^
prog.cpp:6:63: error: ‘it’ was not declared in this scope
  for (int index = 0, auto it = str.begin(); it < str.end(); ++it, ++index)
                                                               ^~
prog.cpp:6:69: error: ‘index’ was not declared in this scope
  for (int index = 0, auto it = str.begin(); it < str.end(); ++it, ++index)
                                                                     ^~~~~

Standard output is empty