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// PR c++/67178
// { dg-do compile { target c++20 } }
template<typename T>
concept c = true;
template<typename T>
concept C0 = requires (auto x) { // { dg-error "placeholder type" }
x;
};
template<typename T>
concept C1 = requires (C1 auto x) { // { dg-error "not been declared|placeholder|two or more|in requirements" }
x; // { dg-error "not declared" }
{ x } -> c; // { dg-message "is invalid" }
};
template<typename T>
requires C1<T>
void f(T) {}
int main() {
f(1); // { dg-error "" }
}
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