<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Perhaps relatedly, it no longer seems possible to mark typealiased closures as @escaping. That was quite handy when you know that closures will always be used asynchronously.<div class=""><br class=""></div><div class=""><br class=""></div><div class="">Jon</div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Sep 7, 2016, at 6:15 PM, Shawn Erickson via swift-users &lt;<a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a>&gt; wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">I should note that this issue also appeared in an earlier variant of Swift after the addition of @escaping but I was on vacation so didn't get a chance to report it then. It isn't new with the Xcode 8 GM.<br class=""><br class=""><div class="gmail_quote"><div dir="ltr" class="">On Wed, Sep 7, 2016 at 3:08 PM Shawn Erickson &lt;<a href="mailto:shawnce@gmail.com" class="">shawnce@gmail.com</a>&gt; wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">I like and fully supported the change to @escaping away from @noescape however in a body of code that I am porting to the latest Swift 3 variant (as found in Xcode 8 GM) I am hitting an issue for methods that take an optional completion closure. If optional is involved I can't find a way to apply @escape to the escaping closure. See the following for an basic example...<div class=""><br class=""></div><div class="">Is their a way to do what I need and/or is this an edge case in the implementation of @escaping?<br class=""><div class=""><br class=""></div><div class=""><div class=""><font face="monospace" size="1" class="">typealias MyCallback = (String)-&gt;()</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Happy</font></div><div class=""><font face="monospace" size="1" class="">func foo1(bar: String, completion: ((String)-&gt;())) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Happy</font></div><div class=""><font face="monospace" size="1" class="">func foo2(bar: String, completion: MyCallback) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Happy</font></div><div class=""><font face="monospace" size="1" class="">func foo3(bar: String, completion: ((String)-&gt;())? = nil) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion?(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Happy</font></div><div class=""><font face="monospace" size="1" class="">func foo4(bar: String, completion: MyCallback? = nil) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion?(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Happy</font></div><div class=""><font face="monospace" size="1" class="">func foo5(bar: String, completion: Optional&lt;MyCallback&gt; = nil) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion?(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Happy</font></div><div class=""><font face="monospace" size="1" class="">func foo6(bar: String, completion: @escaping (String)-&gt;()) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Happy</font></div><div class=""><font face="monospace" size="1" class="">func foo7(bar: String, completion: @escaping MyCallback) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Unhappy...</font></div><div class=""><font face="monospace" size="1" class="">// "@escaping attribute only applies to function types"</font></div><div class=""><font face="monospace" size="1" class="">func foo8(bar: String, completion: @escaping ((String)-&gt;())? = nil) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion?(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Unhappy...</font></div><div class=""><font face="monospace" size="1" class="">// "@escaping attribute only applies to function types"</font></div><div class=""><font face="monospace" size="1" class="">func foo9(bar: String, completion: @escaping MyCallback? = nil) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion?(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Unhappy...</font></div><div class=""><font face="monospace" size="1" class="">// "@escaping attribute only applies to function types"</font></div><div class=""><font face="monospace" size="1" class="">func foo10(bar: String, completion: (@escaping ((String)-&gt;()))? = nil) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion?(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Unhappy...</font></div><div class=""><font face="monospace" size="1" class="">// "@escaping attribute only applies to function types"</font></div><div class=""><font face="monospace" size="1" class="">func foo11(bar: String, completion: (@escaping MyCallback)? = nil) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion?(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div><div class=""><font face="monospace" size="1" class=""><br class=""></font></div><div class=""><font face="monospace" size="1" class="">// Unhappy...</font></div><div class=""><font face="monospace" size="1" class="">// "@escaping attribute only applies to function types"</font></div><div class=""><font face="monospace" size="1" class="">func foo12(bar: String, completion: Optional&lt;@escaping MyCallback&gt; = nil) {</font></div><div class=""><font face="monospace" size="1" class="">&nbsp; &nbsp; completion?(bar)</font></div><div class=""><font face="monospace" size="1" class="">}</font></div></div></div></div></blockquote></div></div>
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