[swift-evolution] access control proposal

[Matthew Johnson]

> Well that would break the pattern where you split the implementation of a type across several extensions in the same file.
> This is also often done when declaring protocol conformance to break down the type into logical pieces. 
> I don't want to be forced to squeeze everything into the same body and declare a list of a dozen protocol conformance at once.
> 
No, it doesn't break that pattern at all.   In that case you already need to declare members visible to all extensions internal.  Nothing in this proposal will prevent you from doing that.  We are discussing use cases where a *single* extension, etc has implementation details it wants to keep hidden from *everything* outside that single extension.

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