[swift-evolution] [Review] Replace `typealias` keyword with `associatedtype` for associated type declarations

[James Campbell]

What about protocoltype ?

Sent from my iPhone

> On 6 Jan 2016, at 22:33, Ross O'Brien via swift-evolution <swift-evolution at swift.org> wrote:
> 
> It seems no different to me than when "instancetype" was added to Objective C (though, that doesn't say anything for the 'Swiftiness' of it).
> 
> Ross
> 
>> On Wed, Jan 6, 2016 at 9:08 PM, Jacob Bandes-Storch via swift-evolution <swift-evolution at swift.org> wrote:
>> I'm sure we're just bikeshedding at this point, but...
>> 
>> I find "typealias" and "fallthrough" much easier to read, and easier to write, than "associatedtype". Upon further in(tro)spection, I think I'm reading typealias and fallthrough as compound words, rather than multiple words with no separation, so there is no question that they should be all-lowercase.
>> 
>> I find associatedtype harder to interpret as a compound word, so I'd expect some separation, either associated_type or associatedType. (I put some other suggestions that I like better in my previous email, though.)
>> 
>> Jacob
>> 
>>> On Wed, Jan 6, 2016 at 12:56 PM, Loïc Lecrenier <swift-evolution at swift.org> wrote:
>>> >
>>> > What about the all lower case “associatedtype”? The underscore alternative of “associated_type” breaks existing language precedent. The camel case version (“associatedType”) does have language precedent, and I wonder if it wouldn’t be a better choice:
>>> >
>>> >    dynamicType
>>> >    didSet
>>> >    willSet
>>> >
>>> > However, there’s also precedent for making paired words all lowercase in keywords:
>>> >
>>> >    typealias
>>> >    fallthrough
>>> >    deinit           ←(debatable: could be considered single word or hyphenated)
>>> >
>>> > Perhaps keyword capitalization conventions deserve some attention across the board.
>>> 
>>> I thought the rules were:
>>> - property/method: lowerCamelCase
>>> - language keyword: lowercase
>>> 
>>> I consider
>>> - dynamicType as a property
>>> - didSet, willSet, deinit as methods.
>>> - typealias, fallthrough as language keywords
>>> 
>>> And “associatedtype” would be a language keyword too, so it is lowercase 😊
>>> 
>>> Loïc
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>> 
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