struct pin_in_out { static void set( bool v ){} };
struct pin_in{ };

template< typename T >
concept bool test_case = requires( bool v ) {
    { T::set( v ) } -> void;
};

int main(){
   std::cout << test_case< pin_in_out > << "n";
   std::cout << test_case< pin_in > << "n";
}

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