By the way, return Never used to be called @noreturn, so you weren't far off! On Fri, Mar 24, 2017 at 02:22 Rien via swift-users <swift-users@swift.org> wrote:
> Excellent! > > Love this list ;-) > > Regards, > Rien > > Site: http://balancingrock.nl > Blog: http://swiftrien.blogspot.com > Github: http://github.com/Balancingrock > Project: http://swiftfire.nl > > > > > > > On 24 Mar 2017, at 10:12, Philip Erickson <philiperick...@gmail.com> > wrote: > > > > I believe returning Never does what you want, e.g. > > > > > > import Foundation > > > > func findReasonAndTerminate() -> Never > > { > > let reason: String = findReason() > > fatalError(reason) > > } > > > > func findReason() -> String > > { > > return "some reason" > > } > > > > func buildData() -> Data? > > { > > return nil > > } > > > > guard let data = buildData() else { findReasonAndTerminate() } > > > > > > On Fri, Mar 24, 2017 at 3:02 AM, Rien via swift-users < > swift-users@swift.org> wrote: > > Is there any way to mark a function as “no return”? > > > > Reason: The compiler generates an error when the else block from a guard > does not terminate the execution by either a return or a fatalError. I want > to call out to a function and raise the fatalError in that function. > > > > func findReasonAndTerminate() { > > let reason: String = …. > > fatalError(reason) > > } > > > > main.swift: > > > > guard let data = buildData() else { findReasonAndTerminate() } > > > > > > Currently the work around is to add another fatalError like this: > > > > guard let data = buildData() else { findReasonAndTerminate(); fatalError > } > > > > > > but it would be nice to have some attribute like @noReturn: > > > > @noReturn > > func findReasonAndTerminate() { … } > > > > > > Regards, > > Rien > > > > Site: http://balancingrock.nl > > Blog: http://swiftrien.blogspot.com > > Github: http://github.com/Balancingrock > > Project: http://swiftfire.nl > > > > > > > > > > > > _______________________________________________ > > swift-users mailing list > > swift-users@swift.org > > https://lists.swift.org/mailman/listinfo/swift-users > > > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users > -- -Saagar Jha
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