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-error@-2{{no matching function for call}} 10 // expected-note@-3{{passing argument to parameter 'a' here}} 11 // expected-note@-4{{candidate function not viable}} 12 // expected-note@-5{{conversion candidate of type 'int (*)(int)'}} 13 14 struct S { 15 template<class T> 16 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}} 17 }; 18 19 template <typename X> 20 int foo2() { 21 X a = 0x61; 22 fn1<char>(a); 23 (void)v1<int>; 24 (void)v1<int *>; // expected-note{{in instantiation of variable template specialization 'v1' requested here}} 25 (void)S::t<int>; // expected-note{{in instantiation of static data member 'S::t<int>' requested here}} 26 return 0; 27 } 28 29 template<class C> 30 int foo3() { 31 C::m1(); // expected-error{{type 'long long' cannot be used prior to '::' because it has no members}} 32 return 1; 33 } 34 35 template<class C> 36 auto v2 = [](int a = foo3<C>()){}; // expected-note{{in instantiation of function template specialization 'foo3<long long>' requested here}} 37 38 int main() { 39 v2<long long>(); // This line causes foo3<long long> to be instantiated. 40 v2<long long>(2); // This line does not. 41 foo2<int>(); 42 } 43