<html><head><style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
padding:1em;
margin:auto;
background:#fefefe;
}
h1, h2, h3, h4, h5, h6 {
font-weight: bold;
}
h1 {
color: #000000;
font-size: 28pt;
}
h2 {
border-bottom: 1px solid #CCCCCC;
color: #000000;
font-size: 24px;
}
h3 {
font-size: 18px;
}
h4 {
font-size: 16px;
}
h5 {
font-size: 14px;
}
h6 {
color: #777777;
background-color: inherit;
font-size: 14px;
}
hr {
height: 0.2em;
border: 0;
color: #CCCCCC;
background-color: #CCCCCC;
display: inherit;
}
p, blockquote, ul, ol, dl, li, table, pre {
margin: 15px 0;
}
a, a:visited {
color: #4183C4;
background-color: inherit;
text-decoration: none;
}
#message {
border-radius: 6px;
border: 1px solid #ccc;
display:block;
width:100%;
height:60px;
margin:6px 0px;
}
button, #ws {
font-size: 12 pt;
padding: 4px 6px;
border-radius: 5px;
border: 1px solid #bbb;
background-color: #eee;
}
code, pre, #ws, #message {
font-family: Monaco;
font-size: 10pt;
border-radius: 3px;
background-color: #F8F8F8;
color: inherit;
}
code {
border: 1px solid #EAEAEA;
margin: 0 2px;
padding: 0 5px;
}
pre {
border: 1px solid #CCCCCC;
overflow: auto;
padding: 4px 8px;
}
pre > code {
border: 0;
margin: 0;
padding: 0;
}
#ws { background-color: #f8f8f8; }
.bloop_markdown table {
border-collapse: collapse;
font-family: Helvetica, arial, freesans, clean, sans-serif;
color: rgb(51, 51, 51);
font-size: 15px; line-height: 25px;
padding: 0; }
.bloop_markdown table tr {
border-top: 1px solid #cccccc;
background-color: white;
margin: 0;
padding: 0; }
.bloop_markdown table tr:nth-child(2n) {
background-color: #f8f8f8; }
.bloop_markdown table tr th {
font-weight: bold;
border: 1px solid #cccccc;
margin: 0;
padding: 6px 13px; }
.bloop_markdown table tr td {
border: 1px solid #cccccc;
margin: 0;
padding: 6px 13px; }
.bloop_markdown table tr th :first-child, table tr td :first-child {
margin-top: 0; }
.bloop_markdown table tr th :last-child, table tr td :last-child {
margin-bottom: 0; }
.bloop_markdown blockquote{
border-left: 4px solid #dddddd;
padding: 0 15px;
color: #777777; }
blockquote > :first-child {
margin-top: 0; }
blockquote > :last-child {
margin-bottom: 0; }
code, pre, #ws, #message {
word-break: normal;
word-wrap: normal;
}
hr {
display: inherit;
}
.bloop_markdown :first-child {
-webkit-margin-before: 0;
}
code, pre, #ws, #message {
font-family: Menlo, Consolas, Liberation Mono, Courier, monospace;
}
.send { color:#77bb77; }
.server { color:#7799bb; }
.error { color:#AA0000; }</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="bloop_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="swift">let a: (x: Int, y: Int) = (1, 2)
var b: (y: Int, x: Int) = a
</code></pre>
<p>Label swap while destructuring:</p>
<pre><code class="swift">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
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>
<p>Is this correct now?</p>
<p></p></div><div class="bloop_original_html"><style>body{font-family:Helvetica,Arial;font-size:13px}</style><div id="bloop_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="bloop_sign_1493963775407723008" class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <br><p class="airmail_on">Am 5. Mai 2017 um 07:53:51, Xiaodi Wu (<a href="mailto:xiaodi.wu@gmail.com">xiaodi.wu@gmail.com</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>
<title></title>
<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.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_-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_-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_-2654004740070611601bloop_original_html">
<div id="m_-2654004740070611601bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">
<span class=""><br></span></div>
<span class=""><br></span>
<div id="m_-2654004740070611601bloop_sign_1493963146083270144" class="m_-2654004740070611601bloop_sign">
<div style="font-family:helvetica,arial;font-size:13px">
<span class="">-- <br>
Adrian Zubarev<br>
Sent with Airmail</span></div>
</div>
<span class=""><br></span>
<div>
<div class="h5">
<p class="m_-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_-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_-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_-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_-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_-2654004740070611601bloop_markdown"></div>
</div>
</blockquote>
</div>
<br></div>
</div>
</div></div></span></blockquote></div><div class="bloop_markdown"><p></p></div></body></html>