[swift-evolution] [Draft] open and public protocols

[Adrian Zubarev]

@Matthew: Have you considered what happens with the access modifier of an open protocol when an open/public class conforms to it?

// Module A
open protocol A {
    func foo()
}

// Module B
open class B : A {
    (open or public) func foo() {}
    // If `open`, can we downgrade to `public`?
    // The other way around seems straightforward 
}
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