In file included from main.cpp:13:0:
initialize_vector.h: In function 'auto initialize_vector(const T&, size_t&& ...)':
initialize_vector.h:14:26: error: 'arg' was not declared in this scope
     return create_vector(arg..., value);
                          ^~~
initialize_vector.h:14:26: note: suggested alternative: 'args'
     return create_vector(arg..., value);
                          ^~~
                          args
main.cpp: In function 'int main()':
main.cpp:25:14: error: 'void a' has incomplete type
         auto a = initialize_vector<int>(17, 10);
              ^
main.cpp:31:14: error: 'void a' has incomplete type
         auto a = initialize_vector<int>(-1, 2, 3);
              ^
main.cpp:37:14: error: 'void a' has incomplete type
         auto a = initialize_vector<std::string>("aba", 3, 4, 2);
              ^
main.cpp:45:14: error: 'void a' has incomplete type
         auto a = initialize_vector<Test>(4, 10);
              ^
main.cpp:52:14: error: 'void a' has incomplete type
         auto a = initialize_vector<int>(v, 2, 1);
              ^
main.cpp:59:14: error: 'void a' has incomplete type
         auto a = initialize_vector<int64_t>(w, 1);
              ^