c++ - Overloaded operator ambiguity on Clang but not on GCC, which one is correct?

#include 


template 
struct Wrapper {
    operator T const &() const & {
        std::cout << "Wrapper::operator T const &() const &\n";
        return _obj;
    }


    operator T&() & {
        std::cout << "Wrapper::operator T&() &\n";
        return _obj;
    }

    operator T&&() && {
        std::cout << "Wrapper::operator T&&() &&\n";
        return std::move(_obj);
    }


private:
    T _obj;
};

struct Test {
    Test& operator=(Test const &test) {
        std::cout << "Test& Test::operator=(Test const &)\n";
        return *this;
    }


    Test& operator=(Test &&test) {
        std::cout << "Test& Test::operator=(Test &&)\n";
        return *this;
    }
};

int main() {
    Test test;
    Wrapper wrapperTest;


    test = wrapperTest;               // OK for all
    test = std::move(wrapperTest);    // OK for GCC and ICC, not for Clang and VC++

    return 0;
}

VC++ :

(34): error C2593: 'operator =' is ambiguous

(26): note: could be 'Test &Test::operator =(Test &&)'

(25): note: or 'Test &Test::operator =(const Test &)'

(69): note: while trying to match the argument list '(Test, Wrapper)'

========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Clang :

:34:7: error: use of overloaded operator '=' is ambiguous (with operand types 'Test' and 'typename std::remove_reference &>::type' (aka 'Wrapper'))

test = std::move(wrapperTest); // OK for GCC and ICC, not for Clang and Microsoft Visual C++

~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~

:25:8: note: candidate function

Test& operator=(Test const &test) { std::cout << "Test& Test::operator=(Test const &)\n"; return *this; }

^

:26:8: note: candidate function

Test& operator=(Test &&test) { std::cout << "Test& Test::operator=(Test &&)\n"; return *this; }

^

1 error generated.