<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 27, 2017, at 10:38 AM, Xiaodi Wu via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">As you write, this operator becomes sugar for “?? fatalError()” once Never becomes a true bottom type.<br class=""><br class="">In the meantime, can’t the same thing be accomplished by overloading fatalError so it’s a generic function that returns a discardable result of type T, which in turn calls the Never-returning overload?<br class=""></div></blockquote><div><br class=""></div><div>I like this idea more than adding an extra operator, but overloading fatalError won’t work now because of <a href="https://github.com/apple/swift/blob/master/stdlib/public/core/Optional.swift#L668" class="">https://github.com/apple/swift/blob/master/stdlib/public/core/Optional.swift#L668</a></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><br class=""><blockquote type="cite" class=""><div class=""><div class="gmail_quote"><div dir="ltr" class="">On Tue, Jun 27, 2017 at 12:25 Erica Sadun via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class=""><div class="">Using an operator to provide feedback on the context of a failed unwrap has become a commonly implemented approach in the Swift developer Community. What are your thoughts about adopting this widely-used operator into the standard library?</div><div class=""><br class=""></div><div class=""><font face="Menlo" class="">guard !lastItem.isEmpty else { return }</font></div><div class=""><font face="Menlo" class="">let lastItem = array.last !! "Array must be non-empty"</font></div><div class=""><br class=""></div><div class="">Details here: <a href="https://gist.github.com/erica/423e4b1c63b95c4c90338cdff4939a9b" target="_blank" class="">https://gist.github.com/erica/423e4b1c63b95c4c90338cdff4939a9b</a></div><div class=""><br class=""></div><div class="">Thank you for your thoughtful feedback, -- E</div><div class=""><br class=""></div></div>_______________________________________________<br class="">
swift-evolution mailing list<br class="">
<a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a><br class="">
<a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" target="_blank" class="">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class="">
</blockquote></div>
_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class="">https://lists.swift.org/mailman/listinfo/swift-evolution<br class=""></div></blockquote></div><br class=""></body></html>