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// PR c++/99874
// { dg-do compile { target c++20 } }
template <class T>
struct A {
static inline auto a = [] <class U> (U) {
return [] <class V> (V) requires requires (T t, U u, V v) { t + u + v; } { };
};
template <class W>
static inline auto b = [] <class U> (U) {
return [] <class V> (V) requires requires (T t, U u, V v, W w) { t + u + v + w; } { };
};
static auto f() {
return [] <class U> (U) {
return [] <class V> (V) requires requires (T t, U u, V v) { t + u + v; } { };
};
}
template <class W>
static auto g() {
return [] <class U> (U) {
return [] <class V> (V) requires requires (T t, U u, V v, W w) { t + u + v + w; } { };
};
}
};
template <class T>
auto a = [] <class U> (U) {
return [] <class V> (V) requires requires (T t, U u, V v) { t + u + v; } { };
};
template <class T>
auto b = [] <class U> (U) {
return [] <class V> (V) {
return [] {
return [] () requires requires (T t, U u, V v) { t + u + v; } { };
};
};
};
int main() {
A<int>::a(0)(0);
A<int>::a(0)(nullptr); // { dg-error "no match" }
A<int>::b<int>(0)(0);
A<int>::b<int>(0)(nullptr); // { dg-error "no match" }
A<int>::f()(0)(0);
A<int>::f()(0)(nullptr); // { dg-error "no match" }
A<int>::g<int>()(0)(0);
A<int>::g<int>()(0)(nullptr); // { dg-error "no match" }
a<int>(0)(0);
a<int>(0)(nullptr); // { dg-error "no match" }
b<int>(0)(0)();
b<int>(0)(nullptr)()(); // { dg-error "no match" }
}
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