What if... 

FooBar.framework defines :
public protocol A {
    func foo()
}
public type B: A {
    public func foo () { 
          … implementation … 
    }
}

Other module defines :
import FooBar
extension A {
    func foo() { .. default implementation … }
}


Jérôme 

> Le 27 avr. 2016 à 19:10, Erica Sadun via swift-evolution 
> <[email protected]> a écrit :
> 
> protocol A {
>     func foo()
> }
> 
> extension A {
>     func foo() { .. default implementation … }
> }
> 
> type B: A {
> 
>     override required func foo () { … overrides implementation … }
> }
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