[swift-evolution] [idea] errors in properties

[Xiaodi Wu]

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”.

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> 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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