[swift-evolution] Swift 3 Generics

[Joe Groff]

> On Dec 15, 2015, at 8:45 PM, Douglas Gregor via swift-evolution <swift-evolution at swift.org> wrote:
> 
> This one is tough. It is a very, very common user request and existentials are painfully under implemented in Swift. On the other hand, it's an additive feature that isn't likely (IMO!) to be important for ABI stabilization in the language or library. So, I would put it out of scope for Swift 3. 

It could be important to stabilizing the standard library, since existentials ought to replace the ad-hoc type-erased AnySequence etc. wrappers that are currently hand-written in the standard library.

-Joe
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