Hello,

With MSVC, the following code compiles. The char overload is selected by overload resolution.

struct S
{
	operator int() const & { return 0; }
	operator char() && { return 0; }
};

void foo(int) {}
void foo(char) {}

int main()
{
	foo(S{}); //OK, calls 'void foo(char)'. 
}

However, the following code won't compile.

struct S
{
	int i = 0;
	operator const int &() const & { return i; }
	operator int &&() && { return (int &&)(i); }
};

void foo(const int &) {}
void foo(int &&) {}

int main()
{
	foo(S{}); //error C2668: 'foo': ambiguous call to overloaded function
                  //message : could be 'void foo(int &&)'
                  //message : or       'void foo(const int &)'
}