[swift-evolution] [idea] errors in properties

Gor Gyolchanyan gor.f.gyolchanyan at icloud.com
Tue Jul 25 15:58:34 CDT 2017

This sounds like a challenge 🙂 
But seriously, seems like straight-up implementing the feature and then wondering whether or not the pull request will be merged in or rejected is an unnecessary gamble, which is why swift-evolution exists.
Haven’t anyone tried to make a proposal for this?
I’d gladly look into implementing it myself if I new for sure that my efforts wouldn’t be wasted.

> On Jul 25, 2017, at 11:55 PM, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:
> There have been a number of discussions on the list in this—Google finds a number of these with a search “swift throwing properties site:lists.swift.org <http://lists.swift.org/>”.
> The “tldr” seems to be that it’s not supported because no one has written code to support it yet.
> On Tue, Jul 25, 2017 at 15:29 Gor Gyolchanyan via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> I’ll just cut to the chase:
> Why is throwing from get, set, willSet and didSet disallowed?
> var login: String {
> 	willSet throws {
> 		guard newValue.count > 5 else {
> 			throw LoginError.loginTooSmall
> 		}
> 	}
> }
> try login = “JebediahKerman” // totally fine
> try login = “Bob” // throws `LoginError.loginTooSmall`
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