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// PR c++/99899
// { dg-do compile { target c++20 } }
template <class T> concept C1 = sizeof(T) > sizeof(int[1]);
template <class>
void f() {
int x[] = {1,2};
int y[] = {3};
C1 auto [a,b] = x; // { dg-error "structured binding declaration cannot have constrained 'auto' type 'auto \\\[requires ::C1<<placeholder>, >\\\]'" }
C1 auto [c] = y; // { dg-error "structured binding declaration cannot have constrained 'auto' type 'auto \\\[requires ::C1<<placeholder>, >\\\]'" }
// { dg-error "constraints" "" { target *-*-* } .-1 }
}
template <class T>
void g() {
T x[] = {1,2};
T y[] = {3};
C1 auto [a,b] = x; // { dg-error "structured binding declaration cannot have constrained 'auto' type 'auto \\\[requires ::C1<<placeholder>, >\\\]'" }
C1 auto [c] = y; // { dg-error "structured binding declaration cannot have constrained 'auto' type 'auto \\\[requires ::C1<<placeholder>, >\\\]'" }
// { dg-error "constraints" "" { target *-*-* } .-1 }
}
template void g<int>();
template <class... Ts> concept C2 = sizeof...(Ts) > 1;
struct S { int a, b; } s;
template <class T>
void h() {
const C2<T> auto& [a, b] = s; // { dg-error "structured binding declaration cannot have constrained 'auto' type 'const auto \\\[requires ::C2<<placeholder>, >\\\]'" }
}
template void h<int>();
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