<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><br></div><div>On Jan 4, 2017, at 20:48, Douglas Gregor via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br><br></div><blockquote type="cite">Yeah. I'm less sure about the other enhancements to existentials fitting into Swift 4, e.g., the creation of existentials for protocols with associated types. Although important, it's a big feature that will take a bunch of design and implementation time, and I'm leery of accepting something that we might not actually be able to achieve.</blockquote><br><div>If it's a feature we know we want, it seems that nailing the syntax down, even if we <i>know</i> there isn't time to actually fully implement it in 4.0, would be beneficial simply to prevent it from being a source-breaking change in 4.1.</div><div><br></div><div>- Dave Sweeris</div></body></html>