[swift-evolution] [swift-evolution-announce] [Accepted with Revision] SE-0177: Allow distinguishing between public access and public overridability

[Scott James Remnant]

I realize that there’s no review needed, but I actually wanted to give a hearty 👏 to the authors and commenters of this proposal, because I genuinely think we’ve reached something good in the result.

The selling point for me is this:

// This is allowed since the superclass is `open`.
class SubclassB : SubclassableParentClass {
    // This is invalid because it overrides a method that is
    // defined outside of the current module but is not `open'.
    override func foo() { }

    // This is allowed since the superclass's method is overridable.
    // It does not need to be marked `open` because it is defined on
    // an `internal` class.
    override func bar() { }
}

This feels super-clean; it gives Library developers `open` for their APIs, without confusing app developers, and still requires that sub-classing Library developers think about `open`.

Good job, everyone!

Scott
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