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// { dg-do compile { target c++20 } }
// { dg-additional-options "-fconcepts" }
template<typename T>
concept Boolean =
requires(T t)
{
{ t } -> bool; // { dg-error "return-type-requirement is not a type-constraint" }
};
template<typename T>
concept C =
requires (T t)
{
{ t } -> Boolean;
};
template<typename T>
struct X;
template<typename T>
requires (! C<typename T::type>)
struct X<T>
{
using type = int;
};
template<typename T>
requires C<typename T::type>
struct X<T>
{
using type = int;
};
struct S
{
using type = char;
};
void f()
{
X<S>::type x;
}
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