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#include <iostream>
#include <string>
 
using namespace std;
 
template <typename T>
void foo(){
	T::value_type bar('a');
 
	cout << bar << endl;
}
 
int main() {
	foo<string>();
 
	return 0;
}

prog.cpp: In function 'void foo()':
prog.cpp:8:2: error: need 'typename' before 'T:: value_type' because 'T' is a dependent scope
  T::value_type bar('a');
  ^
prog.cpp:8:16: error: expected ';' before 'bar'
  T::value_type bar('a');
                ^
prog.cpp:10:10: error: 'bar' was not declared in this scope
  cout << bar << endl;
          ^
prog.cpp: In instantiation of 'void foo() [with T = std::basic_string<char>]':
prog.cpp:14:14:   required from here
prog.cpp:8:2: error: dependent-name 'T:: value_type' is parsed as a non-type, but instantiation yields a type
  T::value_type bar('a');
  ^
prog.cpp:8:2: note: say 'typename T:: value_type' if a type is meant

Standard output is empty