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// RUN: %clang_cc1 -std=c++20 -fsyntax-only -verify %s
struct S {
template<typename Ty = int>
friend void foo(auto){}
template<typename Ty = int, typename Tz>
friend void foo2(){}
};
template<typename T>
struct TemplS {
template<typename Ty = int>
friend void foo3(auto){}
template<typename Ty = int, typename Tz>
friend void foo4(){}
};
void Inst() {
TemplS<int>();
}
// expected-error@+2{{template parameter missing a default argument}}
// expected-note@+1{{previous default template argument defined here}}
template<typename T = int, typename U>
struct ClassTempl{};
struct HasFriendClassTempl {
// expected-error@+1{{default template argument not permitted on a friend template}}
template<typename T = int, typename U>
friend struct Friend;
// expected-error@+3{{cannot define a type in a friend declaration}}
// expected-error@+1{{default template argument not permitted on a friend template}}
template<typename T = int, typename U>
friend struct Friend2{};
};
template<typename Ty>
struct HasFriendClassTempl2 {
// expected-error@+3{{template parameter missing a default argument}}
// expected-note@+2{{previous default template argument defined here}}
// expected-note@#INST2{{in instantiation of template class}}
template<typename T = int, typename U>
friend struct Friend;
};
void Inst2() {
HasFriendClassTempl2<int>(); // #INST2
}
// expected-error@+2{{template parameter missing a default argument}}
// expected-note@+1{{previous default template argument defined here}}
template<typename T = int, typename U>
static constexpr U VarTempl;
// expected-error@+2{{template parameter missing a default argument}}
// expected-note@+1{{previous default template argument defined here}}
template<typename T = int, typename U>
using TypeAlias = U;
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