[swift-evolution] [Review] SE-0062: Referencing Objective-C key-paths

[plx]

> What is your evaluation of the proposal?
I like it and think it’s something Swift should definitely have.

A quibble: I think there’d be value in also having:

   #key(ClassName.propertyName)

…which is the same as `#keyPath`, but without support for *paths*.

It’s functionally-redundant with the more-general #keyPath but makes intent clearer, and is IMHO both shorter and clearer at any call-site that require keys, not key-paths.

> Is the problem being addressed significant enough to warrant a change to Swift?
Yes for the same reasons #selector was added.

> Does this proposal fit well with the feel and direction of Swift?
Yes.

> If you have 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?
Quick read, didn’t follow the lead-up discussion.

> 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>
> Thank you,
> 
> -Doug Gregor
> 
> Review Manager
> 
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