[swift-evolution] [Review] SE-0160: Limiting @objc inference

Brian King brianaking at gmail.com
Wed Mar 22 20:25:44 CDT 2017

> * What is your evaluation of the proposal?
+1 in intent and -1 in detail.

I think reducing the amount of magic helps make swift more powerful and
easier to understand. This will force developers to add a few more `@objc`
tokens, but the consistency will help in the long run.

The last section in "Source Compatibility" calls out a few
problems, presents some possible solutions, but states that they are "Out
of scope for this proposal". Given the depth of migration issues that this
proposal is expected to incur, I think leaving out these details feels
short-sighted. If this proposal is approved, when are the 'out of scope'
behaviors decided?

A few specific opinions on the possibilities presented:
- I'd like a clearer explanation on how the inferred `dynamic` behavior
would change. I would prefer @objc  to always infer dynamic or never infer
dynamic. Currently it's context dependent and confusing.
- I don't like forcing extension methods that are not `@objc` be flagged
`final`. That seems heavy handed.
- I'd like to get over-rides in extensions working!

That said, I'm new here, and I'm a net +0. I trust a good choice will be

> * 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?
No Experience

> * How much effort did you put into your review? A glance, a quick reading,
> or an in-depth study?
In-depth study

>  More information about the Swift evolution process is available at:
>         https://github.com/apple/swift-evolution/blob/master/process.md
> Thanks!
> -Chris Lattner
> Review Manager
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> swift-evolution at swift.org
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