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()) { return a; }(); 8 // expected-error@-1{{cannot initialize a parameter of type 'int' with an rvalue of type 'int *'}} 9 // expected-note@-2{{passing argument to parameter 'a' here}} 10 11 struct S { 12 template<class T> 13 static constexpr T t = [](int f = T(7)){return f;}(); // expected-error{{constexpr variable 't<int>' must be initialized by a constant expression}} expected-note{{cannot be used in a constant expression}} 14 }; 15 16 template <typename X> 17 int foo2() { 18 X a = 0x61; 19 fn1<char>(a); 20 (void)v1<int>; 21 (void)v1<int *>; // expected-note{{in instantiation of variable template specialization 'v1' requested here}} 22 (void)S::t<int>; // expected-note{{in instantiation of static data member 'S::t<int>' requested here}} 23 return 0; 24 } 25 26 template<class C> 27 int foo3() { 28 C::m1(); // expected-error{{type 'long long' cannot be used prior to '::' because it has no members}} 29 return 1; 30 } 31 32 template<class C> 33 auto v2 = [](int a = foo3<C>()){}; // expected-note{{in instantiation of function template specialization 'foo3<long long>' requested here}} 34 35 int main() { 36 v2<long long>(); // This line causes foo3<long long> to be instantiated. 37 v2<long long>(2); // This line does not. 38 foo2<int>(); 39 } 40