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// { dg-options "-std=c++17 -fconcepts" }
struct X { };
int operator==(X, X) { return 0; }
template<typename T>
concept bool C1() { return X(); } // { dg-error "bool" }
template<C1 T>
void h(T) { } // OK until used.
void f()
{
h(0); // { dg-error "does not have|cannot call" }
}
template<typename T>
concept bool C2() { return X() == X(); } // OK
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