[swift-evolution] Enhancing access levels without breaking changes

[Tino Heth]

> I’m not sure that this solves anything meaningful (whether in relation to SE-0169 or more generally), does it? What advantage does this provide over just declaring the protocol conformance and those methods as a direct part of the parent type? This seems like it would just introduce more indentation, and more lines of code, for zero benefit.
Well, I'm not overwhelmingly convinced of this whole "we put same-module stuff into extensions" anyways, so it's debatable wether proposals like SE-0169 have any meaningful effects at all… do you think that conformances in same-file extensions have a real benefit? 

If nothing else, nested extensions could save those who actually don't care much about such issues from another breaking change in Swift — and imho it adds consistency:
We can nest types, so why can't we nest extensions?
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