What's the difference between a protocol extended from AnyObject and a class-only protocol?

Question

Both this declaration

protocol SomeProtocol : AnyObject {
}

and this declaration

protocol SomeProtocol : class {
}
<         


        

Answer 1

AnyObject is a protocol to which all classes implicitly conform (source). So I would say there is no difference: you can use either to require class constraint.