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#include <iostream>
using namespace std;
 
template <class T>
struct A
{
    void g()
    {
        int x = 5;
        {
            typename T::iterator<0> x;
        }
    }
};
 
struct T4
{
    struct Titerator
    {
        Titerator operator < (int value)
        {
            cout << "in operator < " << value << endl;
            return Titerator();
        }
        bool operator > (int value)
        {
            cout << "in operator > " <<  value << endl;
            return false;
        }
    };
    static Titerator iterator;
};
 
T4::Titerator T4::iterator = T4::Titerator();
 
int main(int argc, char* argv[])
{
    A<T4> a4; a4.g();
    return 0;
}
 

prog.cpp: In member function ‘void A<T>::g()’:
prog.cpp:11:25: error: non-template ‘iterator’ used as template
             typename T::iterator<0> x;
                         ^
prog.cpp:11:25: note: use ‘T::template iterator’ to indicate that it is a template
prog.cpp:11:25: error: declaration does not declare anything [-fpermissive]
prog.cpp: In instantiation of ‘void A<T>::g() [with T = T4]’:
prog.cpp:38:20:   required from here
prog.cpp:9:13: warning: unused variable ‘x’ [-Wunused-variable]
         int x = 5;
             ^

Standard output is empty