[swift-evolution] [Review] SE-0112: Improved NSError Bridging

Douglas Gregor dgregor at apple.com
Fri Jul 1 16:12:44 CDT 2016

FYI, in-progress implementation is available at:

	https://github.com/apple/swift/tree/nserror-bridging <https://github.com/apple/swift/tree/nserror-bridging>

The only issue I’ve found so far with the proposal is this bit:

	When we introduce this bridging, we will need to remove NSError's conformance to ErrorProtocol to avoid creating cyclic implicit conversions. However, one can still explicitly turn an NSError into ErrorProtocol via a bridging cast, e.g., nsError as ErrorProtocol.

This doesn’t work, because the model really needs NSError to conform to ErrorProtocol. Instead, we should break the implicit conversion by not allowing an implicit conversion from an arbitrary ErrorProtocol to NSError, which is in line with what SE-0072 would do anyway.

	- Doug

> On Jun 30, 2016, at 11:22 AM, Chris Lattner via swift-evolution <swift-evolution at swift.org> wrote:
> Hello Swift community,
> The review of "SE-0112: Improved NSError Bridging" begins now and runs through July 4. The proposal is available here:
> 	https://github.com/apple/swift-evolution/blob/master/proposals/0112-nserror-bridging.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
> 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 contribute to 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 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
> Thank you,
> -Chris Lattner
> Review Manager
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