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

plx plxswift at icloud.com
Mon Jan 4 16:49:02 CST 2016

On a re-read I am -1; I like the `associatedtype` keyword but didn’t realize there was no plan to let `typealias` be used within a protocol to as a convenience (and to preserve intent, and to improve the development experience when still figuring out an interface design).

I would prefer the new keyword and also adding/allowing one to add convenience typealiases within a protocol definition.

I have not followed the discussion closely to know if there are difficult technical issues with permitting both `associatedtype` declarations and simple convenience `typealias` declarations within a protocol, or if the current proposal is simply making the possible-confusion argument; if there are legit technical issues then so be it, but if it’s just an argument-from-possible-confusion I think the price of clarity is dearer than it needs to be here.

> On Jan 3, 2016, at 1:38 AM, Douglas Gregor via swift-evolution <swift-evolution at swift.org> wrote:
> Hello Swift community,
> The review of "Replace `typealias` keyword with `associatedtype` for associated type declarations” begins now and runs through Wednesday, January 6th. The proposal is available here:
> 	https://github.com/apple/swift-evolution/blob/master/proposals/0011-replace-typealias-associated.md <https://github.com/apple/swift-evolution/blob/master/proposals/0011-replace-typealias-associated.md>
> Reviews are an important part of the Swift evolution process. All reviews should be sent to the swift-evolution mailing list at
> 	https://lists.swift.org/mailman/listinfo/swift-evolution <https://lists.swift.org/mailman/listinfo/swift-evolution>
> or, if you would like to keep your feedback private, directly to the review manager.
> What goes into a review?
> The goal of the review process is to improve the proposal under review through constructive criticism and, eventually, determine the direction of Swift. When writing your review, here are some questions you might want to answer in your review:
> 	* What is your evaluation of the proposal?
> 	* Is the problem being addressed significant enough to warrant a change to Swift?
> 	* Does this proposal fit well with the feel and direction of Swift?
> 	* If you have you used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?
> 	* How much effort did you put into your review? A glance, a quick reading, or an in-depth study?
> More information about the Swift evolution process is available at
> 	https://github.com/apple/swift-evolution/blob/master/process.md <https://github.com/apple/swift-evolution/blob/master/process.md>
> 	Cheers,
> 	Doug Gregor
> 	Review Manager
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