c++ - Name lookup for local class members inside templates -

consider following code, simulates constexpr lambda (proposed c++17, not available in c++14).

#include <iostream>  template<int m, class pred> constexpr auto fun(pred pred) {     return pred(1) <= m; }  template<int m> struct c {         template<int n>         static constexpr auto pred(int x) noexcept         {             // simulate constexpr lambda (not allowed in c++14)             struct lambda             {                     int n_, x_;                      constexpr auto operator()(int y) const noexcept                     {                             return this->n_ * this->x_ + y;                             //     ^^^^       ^^^^ <---- here                     }             };              return fun<m>(lambda{n, x});         } };  int main() {     constexpr auto res = c<7>::template pred<2>(3);     std::cout << res; // prints 1, since 2 * 3 + 1 <= 7; } 

here, lambda defined inside function template member of class template. surprisingly, have this->ambiguate lambda member variables n_ , x_.

live examples (with this->, without this->)

i under impression necessary in dependent base classes, lambda class local class, not dependent base class.

question: can point me relevant standardese name lookup of local class members inside templates?

thanks comment of @dyp, appears bug in clang 3.5 / 3.6 is fixed in clang 3.7 tip of trunk. g++ 4.8.1 through tip of trunk compile correctly well.