#include <vector>

int x = 5;

template<typename T>double f(){      // The name iterator depends on T.
  T::iterator *x;                    // Ambiguity 1:  
                                     //   T::iterator multiplied by x    OR
                                     //   x declared as a pointer to the type named T::iterator
  // ...
}

int main(){
  f<std::vector<double>>();          // Ambiguity 2:
                                     //  >>   shift right   OR
                                     //  end of nested template argument list
}