1 // RUN: %clang_cc1 -std=c++14 -fsyntax-only -verify %s
2 
3 template <class> auto fn0 = [] {};
4 template <typename> void foo0() { fn0<char>(); }
5 
6 template<typename T> auto fn1 = [](auto a) { return a + T(1); };
7 template<typename T> auto v1 = [](int a = T(1)) { return a; }();
8 
9 struct S {
10   template<class T>
11   static constexpr T t = [](int f = T(7)){return f;}(); // expected-error{{constexpr variable 't<int>' must be initialized by a constant expression}} expected-error{{a lambda expression may not appear inside of a constant expression}} expected-note{{cannot be used in a constant expression}}
12 };
13 
14 template <typename X>
15 int foo2() {
16   X a = 0x61;
17   fn1<char>(a);
18   (void)v1<int>;
19   (void)S::t<int>; // expected-note{{in instantiation of static data member 'S::t<int>' requested here}}
20   return 0;
21 }
22 
23 template<class C>
24 int foo3() {
25   C::m1(); // expected-error{{type 'long long' cannot be used prior to '::' because it has no members}}
26   return 1;
27 }
28 
29 template<class C>
30 auto v2 = [](int a = foo3<C>()){};  // expected-note{{in instantiation of function template specialization 'foo3<long long>' requested here}}
31 
32 int main() {
33   v2<long long>();  // This line causes foo3<long long> to be instantiated.
34   v2<long long>(2); // This line does not.
35   foo2<int>();
36 }
37