[swift-evolution] Enhancing access levels without breaking changes

[Tino Heth]

> The one issue I see is sticking that public extension inside a private one.  I think you would have to mark ‘secret: Int’ as private instead of the extension itself to allow the effect you are looking for…
I didn't think that much while writing the example, but this one was actually on purpose:
It's stated in the Swift documentation that the default visibility of members in an extension equals the level of the extension — so this use of extensions is also a way to group all public declarations (the other levels as well), and save some keystrokes.
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