[swift-users] override-like keyword for default implementations

[Johannes Weiss]

Hi swift-users,

Is there anything like the `override` keyword for making sure that default implementations in protocols are not adding a new function?

An example would be the following:

    protocol FooProto {
        func foo()
    }
    
    extension FooProto {
        func foo() { /* <-- can I mark this as being a default implementation */
            print("foo default")
        }
    }

Right now, there's a `func foo()` default implementation for `FooProto` but if later of `foo` gets refactored to `bar`, we lose the default implementation which can lead to problems.

Is there anything in Swift (like the `override` keyword) that allows me to say this is a default implementation and not a new method?

Thanks,
  Johannes