[swift-evolution] [idea] errors in properties

[Jacob Williams]

I’d give my +1 to support this as I’ve wished at one time or another that I could throw in the get, set, willSet, or didSet.

Would this be something a proposal should be written up for when the Swift 5 reviews begin?

> On Jul 25, 2017, at 2:55 PM, Xiaodi Wu via swift-evolution <swift-evolution at swift.org> 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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