Brent Royal-Gordon has written a draft proposal: <https://github.com/apple/swift-evolution/pull/218>
> On 25 Jul 2017, at 21:58, Gor Gyolchanyan via swift-evolution > <[email protected]> wrote: > > 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 <[email protected] >> <mailto:[email protected]>> 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 >> <[email protected] <mailto:[email protected]>> 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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