<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 Jul 1, 2016, at 2:06 AM, Cao Jiannan via swift-evolution &lt;<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>&gt; 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=""><a href="https://github.com/frogcjn/swift-evolution/blob/master/proposals/xxxx-union-type.md" class="">https://github.com/frogcjn/swift-evolution/blob/master/proposals/xxxx-union-type.md</a><div class=""><br class=""></div><div class=""><div class="">Hi,</div><div class=""><br class=""></div><div class="">I'm now officially proposal the union type feature for Swift. Please see:</div></div></div></div></blockquote><br class=""></div><div>FYI, this is clearly out of scope for Swift 3. &nbsp;Please wait until Swift 3 is wound down before bringing this up. &nbsp;Also beware that this topic has come up several times before and there are major semantic problems with it. &nbsp;Please familiarize yourself with those previous discussions.</div><div><br class=""></div><div>-Chris</div></body></html>