Class X

test/generator_test.cpp:74–86

// - generator<X, X&>         ill-formed | ref        | ill-formed

struct X {
    int id;

    X(int id) : id(id) { std::printf("X::X(%i)\n", id); }

    X(const X &x) : id(x.id) { std::printf("X::X(copy %i)\n", id); }

    X(X &&x) : id(std::exchange(x.id, -1)) {
        std::printf("X::X(move %i)\n", id);
    }

    ~X() { std::printf("X::~X(%i)\n", id); }
};

co_context::generator<X> always_ref_example() {
    co_yield X{1};