<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 Feb 2, 2017, at 11:20 AM, Douglas Gregor 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=utf-8" 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 Feb 1, 2017, at 11:44 PM, Adrian Zubarev <<a href="mailto:adrian.zubarev@devandartist.com" class="">adrian.zubarev@devandartist.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="bloop_markdown" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(254, 254, 254);"><p style="margin: 15px 0px; -webkit-margin-before: 0px;" class=""><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal; -webkit-margin-before: 0px;" class="">typealias AnyObject = …</code><span class="Apple-converted-space"> </span>is nice to have, but how about if we fully drop the<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal;" class="">class</code><span class="Apple-converted-space"> </span>constraint-keyword and generalize<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal;" class="">AnyObject</code><span class="Apple-converted-space"> </span>instead?</p></div></div></blockquote><div class="">That’s a good point. My *technical* goal is for AnyObject to cease to be a protocol, because it’s really describing something more fundamental (“it’s a class!”). Whether we spell that constraint as “class” or “AnyObject” doesn’t affect that technical goal.</div><div class=""><br class=""></div><div class="">I’d gravitated toward the “class” spelling because the idea of a class constraint seems most naturally described by “class”, and it’s precedented in C#.</div><div class=""><br class=""></div><div class="">However, the changes in <a href="https://github.com/apple/swift-evolution/blob/master/proposals/0095-any-as-existential.md" class="">SE-0095</a> to make “Any” a more fundamental type (and not just a typealias) definitely open the door to doing the same thing with “AnyObject”—just make it a built-in notion in the language, and the spelling for a class constraint. It *certainly* works better with existentials.</div><br class=""><blockquote type="cite" class=""><div class=""><div class="bloop_markdown" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(254, 254, 254);"><p style="margin: 15px 0px;" class="">In the future we might want to add<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal; -webkit-margin-before: 0px;" class="">AnyValue</code><span class="Apple-converted-space"> </span>with value (semantics) constraint, would that mean that we’d need another keyword there like<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal;" class="">value</code>?</p></div></div></blockquote><div class="">“value” would be a terrible keyword, as you know. Point taken :)</div><div class=""><br class=""></div><div class="">If we did something like this, we would probably want it to be akin to ValueSemantics—not just “it’s a struct or enum”, but “it provides value semantics”, because not all structs/enums provide value semantics (but immutable classes do).</div><div class=""><br class=""></div><blockquote type="cite" class=""><div class=""><div class="bloop_markdown" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(254, 254, 254);"><p style="margin: 15px 0px;" class="">Speaking of the future directions:</p><ul style="margin: 15px 0px;" class=""><li style="margin: 15px 0px; -webkit-margin-before: 0px;" class=""><p style="margin: 15px 0px; -webkit-margin-before: 0px;" class="">Now that we’re no longer supporting the idea of<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal; -webkit-margin-before: 0px;" class="">Any<…></code><span class="Apple-converted-space"> </span>syntax and any type prefixed with<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal;" class="">Any</code><span class="Apple-converted-space"> </span>seems to be special for its particular usage, could we safely bring the empty<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal;" class="">Any</code><span class="Apple-converted-space"> </span>protocol back (is this somehow ABI related?)?</p></li></ul></div></div></blockquote><div class="">From an implementation standpoint, the choice to make AnyObject a magic protocol was a *horrible* decision. We have hacks throughout everything—the compiler, optimizers, runtime, and so on—that specifically check for the magic AnyObject protocol. So, rather than make Any a magic protocol, we need to make AnyObject *not* magic.</div><br class=""><blockquote type="cite" class=""><div class=""><div class="bloop_markdown" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(254, 254, 254);"><ul style="margin: 15px 0px;" class=""><li style="margin: 15px 0px;" class=""><p style="margin: 15px 0px; -webkit-margin-before: 0px;" class="">One day after this proposal is accepted, implemented and released, we probably will talk about the<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal; -webkit-margin-before: 0px;" class="">where</code><span class="Apple-converted-space"> </span>clause for existentials. But since a lot of the existentials will have the form<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal;" class="">typealias Abc = …</code>, this talk will also include the ability to constrain generic typealiases.</p></li></ul></div></div></blockquote><div class="">By “one day” I suspect you mean “some day” rather than “the day after” :)</div><div class=""><br class=""></div><div class="">Yes, I feel like this is a natural direction for existentials to go.</div></div></div></div></blockquote><div><br class=""></div><div>Looking ahead to when this is on the table, I'm a little worried about the syntactic implications of constrained existentials now that the Any<> syntax doesn't seem to be as popular. The obvious way to go would be</div><div><br class=""></div><div>'X & Y where …'</div><div><br class=""></div><div>But that leads to ambiguity in function declarations</div><div><br class=""></div><div>func doTheThing<T>() -> X & Y where … where T == …</div><div><br class=""></div><div>This could be resolved by requiring constrained existentials to be typealiased to return them, but I don't think there's any other situations where we require a typealias to use something, and it just feels like a workaround.</div><div><br class=""></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>David</div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- Doug</div><div class=""><br class=""></div><br class=""><blockquote type="cite" class=""><div class=""><div class="bloop_original_html" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(254, 254, 254);"><div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; margin: 0px;" class=""><br class=""></div><br class=""><div id="bloop_sign_1486019368635563008" class="bloop_sign"><div style="font-family: helvetica, arial; font-size: 13px;" class="">-- <br class="">Adrian Zubarev<br class="">Sent with Airmail</div></div><br class=""><p class="airmail_on" style="margin: 15px 0px;">Am 2. Februar 2017 um 05:52:41, Douglas Gregor via swift-evolution (<a href="mailto:swift-evolution@swift.org" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;" class="">swift-evolution@swift.org</a>) schrieb:</p><blockquote type="cite" class="clean_bq" style="margin: 15px 0px;"><span style="margin-top: 0px; margin-bottom: 0px;" class=""><div dir="auto" class=""><div class=""></div><div class=""><div class=""><br class=""><br class="">Sent from my iPhone</div><div class=""><br class="">On Feb 1, 2017, at 8:46 PM, Slava Pestov <<a href="mailto:spestov@apple.com" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;" class="">spestov@apple.com</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" style="margin: 15px 0px;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""><div class=""><blockquote type="cite" class="" style="margin: 15px 0px;"><div class="" style="margin-top: 0px;">On Feb 1, 2017, at 4:09 PM, Douglas Gregor via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="" style="margin-bottom: 0px;"><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><blockquote type="cite" class="" style="margin: 15px 0px;"><div class="" style="margin-top: 0px;"><br class="Apple-interchange-newline">On Feb 1, 2017, at 3:13 PM, David Hart <<a href="mailto:david@hartbit.com" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">david@hartbit.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="" style="margin-bottom: 0px;"><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Second question inline:</div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""><div class=""><br class=""><br class="">Sent from my iPhone</div>On 1 Feb 2017, at 23:09, David Hart <<a href="mailto:david@hartbit.com" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">david@hartbit.com</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" class="" style="margin: 15px 0px; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div class="" style="margin-top: 0px; margin-bottom: 0px;">I did consider it, but didn’t want to put too much on your plate for Swift 4. But if you’re mentioning it, I’ll go ahead and add it to the second version of the proposal.<div class=""><br class=""></div><div class="">By the way, what you is your point of view about the discussions we’ve had concerning the positioning of the class constraint?</div><div class=""><br class=""></div><div class="">David.</div><div class=""><br class=""><div class=""><blockquote type="cite" class="" style="margin: 15px 0px;"><div class="" style="margin-top: 0px;">On 1 Feb 2017, at 22:58, Douglas Gregor <<a href="mailto:dgregor@apple.com" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">dgregor@apple.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="" style="margin-bottom: 0px;"><div class="" applecontenteditable="true" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br class=""><div class=""><blockquote type="cite" class="" style="margin: 15px 0px;"><div class="" style="margin-top: 0px;">On Jan 29, 2017, at 8:39 AM, David Hart <<a href="mailto:david@hartbit.com" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">david@hartbit.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="" style="margin-bottom: 0px;"><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hello,<div class=""><br class=""></div><div class="">As promised, I wrote the first draft of a proposal to add class requirements to the existential syntax. Please let me know what you think.</div><div class=""><br class=""></div><div class=""><a href="https://github.com/hartbit/swift-evolution/blob/subclass-existentials/proposals/XXXX-subclass-existentials.md" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">https://github.com/hartbit/swift-evolution/blob/subclass-existentials/proposals/XXXX-subclass-existentials.md</a></div></div></div></blockquote><div class=""><br class=""></div><div class="">This looks good! I’m looking forward to the second draft, but I have one question.</div><div class=""><br class=""></div><div class="">Did you consider the generalized “class” constraint? IIRC, this was in Austin’s larger proposal, and it allowed for (e.g.)</div><div class=""><br class=""></div><div class="">typealias CustomStringConvertibleClass = class & CustomStringConvertible // class that conforms to CustomStringConvertible</div><div class=""><br class=""></div><div class="">and potentially a wonderful cleanup where AnyObject ceases to be a weird special protocol and instead becomes</div><div class=""><br class=""></div><div class="">typealias AnyObject = Any & class</div><div class=""><br class=""></div></div></div></div></blockquote></div></div></div></blockquote><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Austin's proposal defines it as:</div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class="pl-k" style="background-color: rgba(255, 255, 255, 0); box-sizing: border-box;"><br class=""></span></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class="pl-k" style="background-color: rgba(255, 255, 255, 0); box-sizing: border-box;">typealias</span><span class="" style="background-color: rgba(255, 255, 255, 0);"><span class="Apple-converted-space"> </span></span><span class="pl-en" style="background-color: rgba(255, 255, 255, 0); box-sizing: border-box;">AnyObject</span><span class="" style="background-color: rgba(255, 255, 255, 0);"><span class="Apple-converted-space"> </span></span><span class="pl-k" style="background-color: rgba(255, 255, 255, 0); box-sizing: border-box;">=</span><span class="" style="background-color: rgba(255, 255, 255, 0);"><span class="Apple-converted-space"> </span>class</span></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class="" style="background-color: rgba(255, 255, 255, 0);"><br class=""></span></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class="" style="background-color: rgba(255, 255, 255, 0);">Is Any necessary?</span></div></div></blockquote><br class=""></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Nah, it should be okay to just have “class” there.</div></div></blockquote><div class=""><br class=""></div>This would mean ‘class’ can appear anywhere we expect to parse a type, or would we have a special grammar rule for the RHS of a typealias?</div></div></blockquote><div class=""><br class=""></div><div class="">This is sorta why I'm nervous about it and suggested the "Any & class" thing. In theory any type can in an expression, so</div><div class=""><br class=""></div><div class=""> class.self </div><div class=""><br class=""></div><div class="">Would be a valid expression.</div><div class=""><br class=""></div><div class="">I don't think it's actually ambiguous, but it feels... odd. And can mess with parser recovery. </div><div class=""><br class=""></div><div class=""> - Doug</div><div class=""><br class=""></div><br class=""><blockquote type="cite" style="margin: 15px 0px;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class=""><div class="">Slava</div><div class=""><br class=""></div><div class=""><blockquote type="cite" class="" style="margin: 15px 0px;"><div class="" style="margin-top: 0px; margin-bottom: 0px;"><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">- Doug</div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></div><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">_______________________________________________</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">swift-evolution mailing list</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><a href="mailto:swift-evolution@swift.org" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none; font-family: Helvetica; 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