<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=""><br class=""><div><blockquote type="cite" class=""><div class="">On Mar 3, 2016, at 4:10 PM, Chris Lattner 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=""><meta http-equiv="Content-Type" content="text/html charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Mar 3, 2016, at 2:14 PM, Jacob Bandes-Storch <<a href="mailto:jtbandes@gmail.com" class="">jtbandes@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Will this allow me to write "let myDispatchSync = dispatch_sync as! @noescape () -> Void" ? :-D</div></div></blockquote><div class=""><br class=""></div>Yes, but you need to spell it like this:</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>let myDispatchSync = dispatch_sync as! ((dispatch_queue_t, @noescape @convention(block) () -> ()) -> Void)<br class=""></div></div></div></blockquote></div><br class=""><div class="">Ah, while this syntactically parses, but the cast is considered to fail at runtime given that it is not a safe conversion. This is the domain of an unsafe cast.</div><div class=""><br class=""></div><div class="">-Chris</div></body></html>