<div dir="ltr">On Fri, May 5, 2017 at 1:00 AM, Adrian Zubarev <span dir="ltr"><<a href="mailto:adrian.zubarev@devandartist.com" target="_blank">adrian.zubarev@devandartist.com</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div class="m_8709656768579954978bloop_markdown"><p>Just to double check, here is the updated version of my code snippet on how it would look like if this proposal will be accepted.</p>
<pre><code class="m_8709656768579954978swift">let a: (x: Int, y: Int) = (1, 2)
var b: (y: Int, x: Int) = a
</code></pre>
<p></p></div></div></blockquote><div>This would be banned. It involves reordering arguments.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div class="m_8709656768579954978bloop_markdown"><p>Label swap while destructuring:</p>
<pre><code class="m_8709656768579954978swift">let tuple: (first: Int, second: (x: Int, y: Int)) = (0, (1, 2))
let (first: a, second: (x: b, y: c)): (first: Int, second: (x: Int, y: Int)) = tuple // fine, unaffected</code></pre></div></div></blockquote><div>This would be banned. You are using labels (things ending with a colon) in a pattern (the stuff that comes after the word "let").</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div class="m_8709656768579954978bloop_markdown"><pre><code class="m_8709656768579954978swift">let (second: (x: b, y: c), first: a): (second: (x: Int, y: Int), first: Int) = tuple // will the rendering be banned or not?</code></pre></div></div></blockquote><div>This would also be banned.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div class="m_8709656768579954978bloop_markdown"><pre><code class="m_8709656768579954978swift">
</code></pre>
<p>Is this correct now?</p>
<p></p></div><div class="m_8709656768579954978bloop_original_html"><span class=""><div id="m_8709656768579954978bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br></div> <br> <div id="m_8709656768579954978bloop_sign_1493963775407723008" class="m_8709656768579954978bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <br></span><div><div class="h5"><p class="m_8709656768579954978airmail_on">Am 5. Mai 2017 um 07:53:51, Xiaodi Wu (<a href="mailto:xiaodi.wu@gmail.com" target="_blank">xiaodi.wu@gmail.com</a>) schrieb:</p> <blockquote type="cite" class="m_8709656768579954978clean_bq"><span><div><div></div><div>
<div dir="ltr">On Fri, May 5, 2017 at 12:52 AM, Adrian Zubarev
<span dir="ltr"><<a href="mailto:adrian.zubarev@devandartist.com" target="_blank">adrian.zubarev@devandartist.<wbr>com</a>></span>
wrote:<br>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_8709656768579954978m_-2654004740070611601bloop_markdown">
<p>Eliminating all labels would mean that even the first example
from my last post will be banned.</p>
</div>
</div>
</blockquote>
<div>No, not eliminating all labels from tuples, but from tuple
_patterns_.</div>
<div> <br></div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_8709656768579954978m_-2654004740070611601bloop_markdown">
<p>Is there any difference from labels in tuple types and labels in
tuples themselves?</p>
<p>Personally I would not support the removal of labels from tuple
types, because it’s a very useful feature that replaces indexed
access like <code>myTuple.1</code> to a more readable counterpart
<code>myTuple.somethingSpecial</code>.</p>
<p>Am I still missing something out?</p>
</div>
<div class="m_8709656768579954978m_-2654004740070611601bloop_original_html">
<div id="m_8709656768579954978m_-2654004740070611601bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">
<span><br></span></div>
<span><br></span>
<div id="m_8709656768579954978m_-2654004740070611601bloop_sign_1493963146083270144" class="m_8709656768579954978m_-2654004740070611601bloop_sign">
<div style="font-family:helvetica,arial;font-size:13px">
<span>-- <br>
Adrian Zubarev<br>
Sent with Airmail</span></div>
</div>
<span><br></span>
<div>
<div class="m_8709656768579954978h5">
<p class="m_8709656768579954978m_-2654004740070611601airmail_on">Am 5. Mai 2017 um
07:43:49, Xiaodi Wu (<a href="mailto:xiaodi.wu@gmail.com" target="_blank">xiaodi.wu@gmail.com</a>) schrieb:</p>
<blockquote type="cite" class="m_8709656768579954978m_-2654004740070611601clean_bq">
<div>
<div>
<div dir="ltr"><span>On Fri, May 5, 2017 at 12:42 AM, Adrian
Zubarev via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span>
wrote:<br></span>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_8709656768579954978m_-2654004740070611601m_-1319762173201981654bloop_markdown">
<p>Okay now I see where this is going. So basically you want to
mirror the behavior of function parameters into tuples.</p>
<p>You might want to be a little bit more explicit on types in your
proposal to better understand the so called ‘tuple shuffle’.</p>
<pre><code class="m_8709656768579954978m_-2654004740070611601m_-1319762173201981654swift">let a: (x: Int, y: Int) = (x: 1, y: 2)
var b: (y: Int, x: Int) = a
a.x == b.x
a.y == b.y
</code></pre>
<p>Label swap (tuple shuffle) while destructuring:</p>
<pre><code class="m_8709656768579954978m_-2654004740070611601m_-1319762173201981654swift">let tuple: (first: Int, second: (x: Int, y: Int)) = (first: 0, second: (x: 1, y: 2))
let (first: a, second: (x: b, y: c)): (first: Int, second: (x: Int, y: Int)) = tuple // fine, unaffected
let (second: (x: b, y: c), first: a): (second: (x: Int, y: Int), first: Int) = tuple // shuffle => error</code></pre></div>
</div>
</blockquote>
<div><br></div>
<div>No, I thought this was what Robert was proposing, but he is
proposing the elimination of all labels in tuple patterns. Your
second example would be banned.</div>
<div><br></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
<div class="m_8709656768579954978m_-2654004740070611601bloop_markdown"></div>
</div>
</blockquote>
</div>
<br></div>
</div>
</div></div></span></blockquote></div></div></div><div class="m_8709656768579954978bloop_markdown"><p></p></div></div></blockquote></div><br></div></div>