41 lines · cpp
1// RUN: %clang_cc1 -std=c++14 -fsyntax-only -verify %s2 3template <class> auto fn0 = [] {};4template <typename> void foo0() { fn0<char>(); }5 6template<typename T> auto fn1 = [](auto a) { return a + T(1); };7template<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{{in instantiation of default function argument expression for 'operator()<int *>' required here}}10// expected-note@-3{{passing argument to parameter 'a' here}}11 12struct S {13 template<class T>14 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}}15};16 17template <typename X>18int foo2() {19 X a = 0x61;20 fn1<char>(a);21 (void)v1<int>;22 (void)v1<int *>; // expected-note{{in instantiation of variable template specialization 'v1' requested here}}23 (void)S::t<int>; // expected-note{{in instantiation of static data member 'S::t<int>' requested here}}24 return 0;25}26 27template<class C>28int foo3() {29 C::m1(); // expected-error{{type 'long long' cannot be used prior to '::' because it has no members}}30 return 1;31}32 33template<class C>34auto v2 = [](int a = foo3<C>()){}; // expected-note{{in instantiation of function template specialization 'foo3<long long>' requested here}}35 36int main() {37 v2<long long>(); // This line causes foo3<long long> to be instantiated.38 v2<long long>(2); // This line does not.39 foo2<int>();40}41