operator& can be overloaded as a free function

[EricWF]

When checking if operator& has been overloaded you should check if it is a free function as well.
Let me know if I've missed anything

[viboes]

Could you point to the code that is doing the check. I don't believe the code is able to check if operator& has been overloaded as a member or free function, as you just check for valid expressions.