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* What is your evaluation of the proposal?<br></blockquote><div><br></div><div>This is improved from the previous iteration. The code example needs updating, as both instances of `open func bar()` should be `public open func bar()` as outlined in the Proposed Design section.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
* Does this proposal fit well with the feel and direction of Swift?<br></blockquote><div><br></div><div>Yes, mostly. There is one comment in the code example that describes a restriction which does not fit with the direction of Swift. It is not the main focus of the proposal but I think should be changed. Namely, the proposal comments:</div><div><br></div><div>"[The declaration `[public] open func bar()` inside a class not marked `open`] raises a compilation error: a method can't be marked `open` if the class it belongs to can't be subclassed."</div><div><br></div><div>This is discordant with the direction resolved by the core team in the SE-0025 revisions, where it was stated with regard to access modifiers:</div><div><br></div><div>"The compiler should not warn when a broader level of access control is used within a type with more restrictive access, such as `internal` within a `private` type. This allows the owner of the type to design the access they would use were they to make the type more widely accessible."</div><div><br></div><div>Applying the same rationale here would suggest that the compiler should not raise an error if a method is marked `open` inside a non-`open` type, in order to allow the owner of the type to design as though to make it subclassable without actually having to do so.</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
* If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?<br></blockquote><div><br></div><div>Yes, I've used OOP in other languages. As discussed, this approach is different from that taken by many of those but is a deliberate step.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
* How much effort did you put into your review? A glance, a quick reading, or an in-depth study?<br></blockquote><div><br></div><div>Followed the discussion, read proposal carefully.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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More information about the Swift evolution process is available at<br>
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<a href="https://github.com/apple/swift-evolution/blob/master/process.md" rel="noreferrer" target="_blank">https://github.com/apple/swift-evolution/blob/master/process.md</a><br>
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Thank you,<br>
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-Chris Lattner<br>
Review Manager<br>
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