[swift-evolution] [Pitch] Several improvements points about extension and typealias

[Robert Widmann]

~Robert Widmann

2016/10/05 11:00、Cao, Jiannan via swift-evolution <swift-evolution at swift.org> のメッセージ:

> 1. Allow extension specific dictionary
> e.g.
> extension Dictionary where Key == String, Value == String
> or
> extension Dictionary<String, String>
> 

This was just committed by Slava yesterday.

> 2. Allow extending Equatable internally
> currently any type extend to Equatable should make theme public

"Hidden Conformances" are discussed in the generics manifesto.

> 
> 3. Allow internal typealias for a public type
> this internal typealias will only can be used in that package.

Interesting idea.

> 
> Thanks
> 
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