This issue about `numbers in` was raised during review of SE-0066; if I recall, the core team considered and rejected disallowing that syntax in closures. Since we're minimizing source-breaking changes, the issue is settled in my view, having been proposed, commented upon, reviewed, and rejected.<br><div class="gmail_quote"><div dir="ltr">On Mon, Dec 19, 2016 at 15:39 Anton Zhilin via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="gmail_msg"><div class="m_891795663522954851markdown-here-wrapper gmail_msg"><p style="margin:0px 0px 1.2em!important" class="gmail_msg">2016-12-17 2:55 GMT+03:00 Vip Malixi via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="gmail_msg" target="_blank">swift-evolution@swift.org</a>>:</p>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg"></p><div class="m_891795663522954851markdown-here-exclude gmail_msg"><p class="gmail_msg"></p><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="color:rgb(0,0,0);background-color:rgb(255,255,255);font-family:HelveticaNeue-Light,"Helvetica Neue Light","Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif" class="gmail_msg"><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg">var oneParameterAndMultipleReturn: ([Int]) -> (even:[Int], odd:[Int]) = { numbers -> ([Int], [Int]) in <br class="gmail_msg"></div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"> var evenNumberArray = [Int]()</div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"> var oddNumberArray = [Int]()</div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"><br class="gmail_msg"></div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"> for number in numbers {</div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"> number % 2 == 0 ? evenNumberArray.append(number) : oddNumberArray.append(number)</div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"> }</div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"><br class="gmail_msg"></div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"> return (evenNumberArray, oddNumberArray)</div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg">}<br class="gmail_msg"></div></div></blockquote><p class="gmail_msg"></p></div><p style="margin:0px 0px 1.2em!important" class="gmail_msg"></p>
</div></div><div dir="ltr" class="gmail_msg"><div class="m_891795663522954851markdown-here-wrapper gmail_msg"><p style="margin:0px 0px 1.2em!important" class="gmail_msg">The above code is valid, because:</p>
<ol style="margin:1.2em 0px;padding-left:2em" class="gmail_msg">
<li style="margin:0.5em 0px" class="gmail_msg">Multi-return is just a type of tuple with labeled components.</li>
<li style="margin:0.5em 0px" class="gmail_msg">Labeled tuples and normal tuples are implicitly convertible.</li>
</ol>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg">The only way we could make such code invalid is by removing labeled tuples altogether. -1 on that.<br class="gmail_msg">This problem mostly refers to code style, and the above variant can be more self-documenting in some cases.</p></div></div><div dir="ltr" class="gmail_msg"><div class="m_891795663522954851markdown-here-wrapper gmail_msg">
<p style="margin:0px 0px 1.2em!important" class="gmail_msg"></p><div class="m_891795663522954851markdown-here-exclude gmail_msg"><p class="gmail_msg"></p><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="gmail_msg"><div style="color:rgb(0,0,0);background-color:rgb(255,255,255);font-family:HelveticaNeue-Light,"Helvetica Neue Light","Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif" class="gmail_msg"><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg">Also, again for consistency and clarity, parameters in Closures should always be surrounded by parentheses, even single parameters:</div><div id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_2839" dir="ltr" class="gmail_msg"><br class="gmail_msg"></div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3467" class="gmail_msg">var oneParameterAndMultipleReturn: ([Int]) -> ([Int], [Int]) = { (numbers) -> (even:[Int], odd:[Int]) in </div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3468" class="gmail_msg"> var evenNumberArray = [Int]()</div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3469" class="gmail_msg"> var oddNumberArray = [Int]()</div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3470" class="gmail_msg"><br id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3471" class="gmail_msg"></div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3472" class="gmail_msg"> for number in numbers {</div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3473" class="gmail_msg"> number % 2 == 0 ? evenNumberArray.append(number) : oddNumberArray.append(number)</div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3474" class="gmail_msg"> }</div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3475" class="gmail_msg"><br id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3476" class="gmail_msg"></div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3477" class="gmail_msg"> return (evenNumberArray, oddNumberArray)</div><div dir="ltr" id="m_891795663522954851m_-7360247118073459990yui_3_16_0_ym19_1_1481931868851_3478" class="gmail_msg">}</div></div></div></blockquote><p class="gmail_msg"></p></div><p style="margin:0px 0px 1.2em!important" class="gmail_msg"></p>
</div></div><div dir="ltr" class="gmail_msg"><div class="m_891795663522954851markdown-here-wrapper gmail_msg"><p style="margin:0px 0px 1.2em!important" class="gmail_msg">This should be considered a bug. <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline" class="gmail_msg">numbers in</code> or <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline" class="gmail_msg">(numbers) in</code> or <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline" class="gmail_msg">(numbers) -> (...) in</code>, but not <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline" class="gmail_msg">numbers -> (...) in</code>, because the latter forms should be correct types.<br class="gmail_msg">Whether or not just <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline" class="gmail_msg">numbers in</code> should be allowed, is another talk.</p>
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