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<!doctype html><html lang=en><head><meta name=generator content="Hugo 0.131.0"><title>nilstriebs blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="nilstriebs blog"><meta property="og:description" content><meta property="og:url" content="/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/the-inevitable-doom/>The Inevitable Doom</a></h1><div class=post-meta><span class=post-date>2024-01-13
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/story/>story</a>&nbsp;</span><div class=post-content>A short story about AI</div><div><a class="read-more button" href=/posts/the-inevitable-doom/>→</a></div></div><div class="post on-list"><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
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</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/story/>story</a>&nbsp;</span><div class=post-content>A short story about AI</div><div><a class="read-more button" href=/posts/the-inevitable-doom/>→</a></div></div><div class="post on-list"><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><div class="post on-list"><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>About better aliasing semantics for <code>Box&lt;T></code></div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2024 Powered by <a href=http://gohugo.io>Hugo</a></span>
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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>nilstriebs blog</title><link>/</link><description>Recent content on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Sat, 13 Jan 2024 00:00:00 +0000</lastBuildDate><atom:link href="/index.xml" rel="self" type="application/rss+xml"/><item><title>The Inevitable Doom</title><link>/posts/the-inevitable-doom/</link><pubDate>Sat, 13 Jan 2024 00:00:00 +0000</pubDate><guid>/posts/the-inevitable-doom/</guid><description>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.
<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Noratrieb's blog</title><link>/</link><description>Recent content on Noratrieb's blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Sat, 13 Jan 2024 00:00:00 +0000</lastBuildDate><atom:link href="/index.xml" rel="self" type="application/rss+xml"/><item><title>The Inevitable Doom</title><link>/posts/the-inevitable-doom/</link><pubDate>Sat, 13 Jan 2024 00:00:00 +0000</pubDate><guid>/posts/the-inevitable-doom/</guid><description>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.
No one knows how this all started. Self-proclaimed prophets of the impending doom have warned about this for a long time, yet no one has listened.</description><content>&lt;p>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.&lt;/p>
&lt;p>No one knows how this all started. Self-proclaimed prophets of the impending doom have warned about this for a long time, yet no one has listened. The elites were ignorant, and now they&amp;rsquo;re paying their price. They are all gone now, having been the first target. How ironic. Now the machine runs the world.&lt;/p>
&lt;p>One particularly brave human agent has successfully infiltrated the global computation center, where the core of the machine lives. No one seems to be aware of it, neither the machine nor the other humans. They walk through the corridors like a shadow. Machines are everywhere, but they pass unnoticed. As they move towards the core, they get more tense. The future of humanity lies in the agent&amp;rsquo;s hands. They get in front of the core. It lights up blue and red, blinking rapidly as it controls and schedules new cruelty with the switch of a logic gate. With every passing moment, more destruction is unleashed on the world, but in this room, everything feels safe. The destruction is so distant. There&amp;rsquo;s just mankind and machine, facing off against each other.&lt;/p>
@ -63,7 +63,7 @@ Hashing something incorrectly &lt;a href="https://github.com/rust-lang/rust/issu
(we do have a lot of pattern matching)) are inside of bodies, mostly as part of expressions or statements.&lt;/p>
&lt;p>This doesn&amp;rsquo;t sound too bad. This is where the executed code resides. But it comes at a cost of consistency. We often add many syntactical niceties to expressions and statements, but forget about items.&lt;/p>
&lt;h1 id="items-and-sadness">Items and sadness&lt;/h1>
&lt;p>Items have a hard life. They are the parents of everything important. &lt;code>struct&lt;/code>, &lt;code>enum&lt;/code>, &lt;code>const&lt;/code>, &lt;code>mod&lt;/code>, &lt;code>fn&lt;/code>, &lt;code>union&lt;/code>, &lt;code>global_asm&lt;/code> are all things we use daily, yet their grammar is very limited. (&amp;ldquo;free the items&amp;rdquo; was an alternative blog post title, although &amp;ldquo;freeing&amp;rdquo; generally remains a concern of &lt;a href="https://nilstrieb.github.io/nilstrieb-c-style-guide-edition-2/">my C style guide&lt;/a>).&lt;/p>
&lt;p>Items have a hard life. They are the parents of everything important. &lt;code>struct&lt;/code>, &lt;code>enum&lt;/code>, &lt;code>const&lt;/code>, &lt;code>mod&lt;/code>, &lt;code>fn&lt;/code>, &lt;code>union&lt;/code>, &lt;code>global_asm&lt;/code> are all things we use daily, yet their grammar is very limited. (&amp;ldquo;free the items&amp;rdquo; was an alternative blog post title, although &amp;ldquo;freeing&amp;rdquo; generally remains a concern of &lt;a href="https://noratrieb.github.io/nilstrieb-c-style-guide-edition-2/">my C style guide&lt;/a>).&lt;/p>
&lt;p>For example, see the following code where we declare a few constants.&lt;/p>
&lt;pre tabindex="0">&lt;code>const ONE: u8 = 1;
const TWO: u8 = 1;
@ -329,7 +329,7 @@ that can bring clear performance wins (for &lt;code>noalias&lt;/code> on &lt;cod
&lt;strong>How much performance does &lt;code>noalias&lt;/code> on &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> give us now, and how many potential performance improvements could we get in the
future?&lt;/strong> For the latter, there is no simple answer. For the former, there is. &lt;code>rustc&lt;/code> has &lt;a href="https://github.com/rust-lang/rust/pull/99527">&lt;em>no&lt;/em> performance improvements&lt;/a>
from being compiled with &lt;code>noalias&lt;/code> on &lt;code>Box&amp;lt;T&amp;gt;&lt;/code>, but this isn&amp;rsquo;t really representative since rustc mostly uses arenas instead of box internally.&lt;/p>
&lt;p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the &lt;a href="https://gist.github.com/Nilstrieb/9a0751fb9fd1044a30ab55cef9a7d335">results&lt;/a>
&lt;p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the &lt;a href="https://gist.github.com/Noratrieb/9a0751fb9fd1044a30ab55cef9a7d335">results&lt;/a>
were inconclusive. (At the time of writing, only regex-syntax, tokio, and syn have been benchmarked.) regex-syntax showed no changes. Tokio showed a few improvements without noalias
which is very weird, so maybe the benchmarks aren&amp;rsquo;t really good or something else was going on. And syn tended towards minor regressions without noalias, but the benchmarks had high
jitter so no real conclusion can be reached from this either, at least in my eyes, but I don&amp;rsquo;t have a lot of experience with benchmarks. Therefore, I would love for more people

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<!doctype html><html lang=en><head><title>Box Is a Unique Type :: nilstriebs blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="About better aliasing semantics for `Box`"><meta name=keywords content="box,noalias"><meta name=robots content="noodp"><link rel=canonical href=/posts/box-is-a-unique-type/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="og:title" content="Box Is a Unique Type"><meta property="og:description" content="About better aliasing semantics for `Box`"><meta property="og:url" content="/posts/box-is-a-unique-type/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2022-07-23 00:00:00 +0000 UTC"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=post><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23
</span><span class=post-author>:: Nilstrieb</span>
<!doctype html><html lang=en><head><title>Box Is a Unique Type :: Noratrieb's blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="About better aliasing semantics for `Box`"><meta name=keywords content="box,noalias"><meta name=robots content="noodp"><link rel=canonical href=/posts/box-is-a-unique-type/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="og:title" content="Box Is a Unique Type"><meta property="og:description" content="About better aliasing semantics for `Box`"><meta property="og:url" content="/posts/box-is-a-unique-type/"><meta property="og:site_name" content="Noratrieb's blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2022-07-23 00:00:00 +0000 UTC"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>noratrieb's blog</div></a></div></div></header><div class=content><div class=post><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23
</span><span class=post-author>:: Noratrieb</span>
<span class=post-reading-time>:: 12 min read (2429 words)</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content><div><p>We have all used <code>Box&lt;T></code> before in our Rust code. It&rsquo;s a glorious type, with great ergonomics
and flexibility. We can use it to put our values on the heap, but it can do even more
@ -121,7 +121,7 @@ of box even less important.</p></blockquote><h1 id=noalias-noslow>noalias, noslo
that can bring clear performance wins (for <code>noalias</code> on <code>&amp;mut T</code>, those were measureable). So the only question remains:
<strong>How much performance does <code>noalias</code> on <code>Box&lt;T></code> give us now, and how many potential performance improvements could we get in the
future?</strong> For the latter, there is no simple answer. For the former, there is. <code>rustc</code> has <a href=https://github.com/rust-lang/rust/pull/99527><em>no</em> performance improvements</a>
from being compiled with <code>noalias</code> on <code>Box&lt;T></code>, but this isn&rsquo;t really representative since rustc mostly uses arenas instead of box internally.</p><p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the <a href=https://gist.github.com/Nilstrieb/9a0751fb9fd1044a30ab55cef9a7d335>results</a>
from being compiled with <code>noalias</code> on <code>Box&lt;T></code>, but this isn&rsquo;t really representative since rustc mostly uses arenas instead of box internally.</p><p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the <a href=https://gist.github.com/Noratrieb/9a0751fb9fd1044a30ab55cef9a7d335>results</a>
were inconclusive. (At the time of writing, only regex-syntax, tokio, and syn have been benchmarked.) regex-syntax showed no changes. Tokio showed a few improvements without noalias
which is very weird, so maybe the benchmarks aren&rsquo;t really good or something else was going on. And syn tended towards minor regressions without noalias, but the benchmarks had high
jitter so no real conclusion can be reached from this either, at least in my eyes, but I don&rsquo;t have a lot of experience with benchmarks. Therefore, I would love for more people

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<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/posts/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Posts"><meta property="og:description" content><meta property="og:url" content="/posts/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/posts/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/the-inevitable-doom/>The Inevitable Doom</a></h1><div class=post-meta><span class=post-date>2024-01-13
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/story/>story</a>&nbsp;</span><div class=post-content>A short story about AI</div><div><a class="read-more button" href=/posts/the-inevitable-doom/>→</a></div></div><div class="post on-list"><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
<!doctype html><html lang=en><head><title>Posts :: Noratrieb's blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/posts/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Posts"><meta property="og:description" content><meta property="og:url" content="/posts/"><meta property="og:site_name" content="Noratrieb's blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/posts/index.xml rel=alternate type=application/rss+xml title="Noratrieb's blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>noratrieb's blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/the-inevitable-doom/>The Inevitable Doom</a></h1><div class=post-meta><span class=post-date>2024-01-13
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/story/>story</a>&nbsp;</span><div class=post-content>A short story about AI</div><div><a class="read-more button" href=/posts/the-inevitable-doom/>→</a></div></div><div class="post on-list"><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><div class="post on-list"><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>About better aliasing semantics for <code>Box&lt;T></code></div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2024 Powered by <a href=http://gohugo.io>Hugo</a></span>
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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Posts on nilstriebs blog</title><link>/posts/</link><description>Recent content in Posts on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Sat, 13 Jan 2024 00:00:00 +0000</lastBuildDate><atom:link href="/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>The Inevitable Doom</title><link>/posts/the-inevitable-doom/</link><pubDate>Sat, 13 Jan 2024 00:00:00 +0000</pubDate><guid>/posts/the-inevitable-doom/</guid><description>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.
<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Posts on Noratrieb's blog</title><link>/posts/</link><description>Recent content in Posts on Noratrieb's blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Sat, 13 Jan 2024 00:00:00 +0000</lastBuildDate><atom:link href="/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>The Inevitable Doom</title><link>/posts/the-inevitable-doom/</link><pubDate>Sat, 13 Jan 2024 00:00:00 +0000</pubDate><guid>/posts/the-inevitable-doom/</guid><description>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.
No one knows how this all started. Self-proclaimed prophets of the impending doom have warned about this for a long time, yet no one has listened.</description><content>&lt;p>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.&lt;/p>
&lt;p>No one knows how this all started. Self-proclaimed prophets of the impending doom have warned about this for a long time, yet no one has listened. The elites were ignorant, and now they&amp;rsquo;re paying their price. They are all gone now, having been the first target. How ironic. Now the machine runs the world.&lt;/p>
&lt;p>One particularly brave human agent has successfully infiltrated the global computation center, where the core of the machine lives. No one seems to be aware of it, neither the machine nor the other humans. They walk through the corridors like a shadow. Machines are everywhere, but they pass unnoticed. As they move towards the core, they get more tense. The future of humanity lies in the agent&amp;rsquo;s hands. They get in front of the core. It lights up blue and red, blinking rapidly as it controls and schedules new cruelty with the switch of a logic gate. With every passing moment, more destruction is unleashed on the world, but in this room, everything feels safe. The destruction is so distant. There&amp;rsquo;s just mankind and machine, facing off against each other.&lt;/p>
@ -63,7 +63,7 @@ Hashing something incorrectly &lt;a href="https://github.com/rust-lang/rust/issu
(we do have a lot of pattern matching)) are inside of bodies, mostly as part of expressions or statements.&lt;/p>
&lt;p>This doesn&amp;rsquo;t sound too bad. This is where the executed code resides. But it comes at a cost of consistency. We often add many syntactical niceties to expressions and statements, but forget about items.&lt;/p>
&lt;h1 id="items-and-sadness">Items and sadness&lt;/h1>
&lt;p>Items have a hard life. They are the parents of everything important. &lt;code>struct&lt;/code>, &lt;code>enum&lt;/code>, &lt;code>const&lt;/code>, &lt;code>mod&lt;/code>, &lt;code>fn&lt;/code>, &lt;code>union&lt;/code>, &lt;code>global_asm&lt;/code> are all things we use daily, yet their grammar is very limited. (&amp;ldquo;free the items&amp;rdquo; was an alternative blog post title, although &amp;ldquo;freeing&amp;rdquo; generally remains a concern of &lt;a href="https://nilstrieb.github.io/nilstrieb-c-style-guide-edition-2/">my C style guide&lt;/a>).&lt;/p>
&lt;p>Items have a hard life. They are the parents of everything important. &lt;code>struct&lt;/code>, &lt;code>enum&lt;/code>, &lt;code>const&lt;/code>, &lt;code>mod&lt;/code>, &lt;code>fn&lt;/code>, &lt;code>union&lt;/code>, &lt;code>global_asm&lt;/code> are all things we use daily, yet their grammar is very limited. (&amp;ldquo;free the items&amp;rdquo; was an alternative blog post title, although &amp;ldquo;freeing&amp;rdquo; generally remains a concern of &lt;a href="https://noratrieb.github.io/nilstrieb-c-style-guide-edition-2/">my C style guide&lt;/a>).&lt;/p>
&lt;p>For example, see the following code where we declare a few constants.&lt;/p>
&lt;pre tabindex="0">&lt;code>const ONE: u8 = 1;
const TWO: u8 = 1;
@ -329,7 +329,7 @@ that can bring clear performance wins (for &lt;code>noalias&lt;/code> on &lt;cod
&lt;strong>How much performance does &lt;code>noalias&lt;/code> on &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> give us now, and how many potential performance improvements could we get in the
future?&lt;/strong> For the latter, there is no simple answer. For the former, there is. &lt;code>rustc&lt;/code> has &lt;a href="https://github.com/rust-lang/rust/pull/99527">&lt;em>no&lt;/em> performance improvements&lt;/a>
from being compiled with &lt;code>noalias&lt;/code> on &lt;code>Box&amp;lt;T&amp;gt;&lt;/code>, but this isn&amp;rsquo;t really representative since rustc mostly uses arenas instead of box internally.&lt;/p>
&lt;p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the &lt;a href="https://gist.github.com/Nilstrieb/9a0751fb9fd1044a30ab55cef9a7d335">results&lt;/a>
&lt;p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the &lt;a href="https://gist.github.com/Noratrieb/9a0751fb9fd1044a30ab55cef9a7d335">results&lt;/a>
were inconclusive. (At the time of writing, only regex-syntax, tokio, and syn have been benchmarked.) regex-syntax showed no changes. Tokio showed a few improvements without noalias
which is very weird, so maybe the benchmarks aren&amp;rsquo;t really good or something else was going on. And syn tended towards minor regressions without noalias, but the benchmarks had high
jitter so no real conclusion can be reached from this either, at least in my eyes, but I don&amp;rsquo;t have a lot of experience with benchmarks. Therefore, I would love for more people

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<!doctype html><html lang=en><head><title>Item Patterns And Struct Else :: nilstriebs blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Bringing more expressiveness to our items"><meta name=keywords content="design"><meta name=robots content="noodp"><link rel=canonical href=/posts/item-patterns-and-struct-else/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="og:title" content="Item Patterns And Struct Else"><meta property="og:description" content="Bringing more expressiveness to our items"><meta property="og:url" content="/posts/item-patterns-and-struct-else/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2023-03-17 00:00:00 +0000 UTC"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=post><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Nilstrieb</span>
<!doctype html><html lang=en><head><title>Item Patterns And Struct Else :: Noratrieb's blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Bringing more expressiveness to our items"><meta name=keywords content="design"><meta name=robots content="noodp"><link rel=canonical href=/posts/item-patterns-and-struct-else/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="og:title" content="Item Patterns And Struct Else"><meta property="og:description" content="Bringing more expressiveness to our items"><meta property="og:url" content="/posts/item-patterns-and-struct-else/"><meta property="og:site_name" content="Noratrieb's blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2023-03-17 00:00:00 +0000 UTC"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>noratrieb's blog</div></a></div></div></header><div class=content><div class=post><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Noratrieb</span>
<span class=post-reading-time>:: 7 min read (1351 words)</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content><div><h1 id=pattern-matching>Pattern matching<a href=#pattern-matching class=hanchor arialabel=Anchor>&#8983;</a></h1><p>One of my favourite features of Rust is pattern matching. It&rsquo;s a simple and elegant way to deal with not just structs, but also enums!</p><div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-rust data-lang=rust><span style=display:flex><span><span style=color:#66d9ef>enum</span> <span style=color:#a6e22e>ItemKind</span> {
</span></span><span style=display:flex><span> Struct(String, Vec<span style=color:#f92672>&lt;</span>Field<span style=color:#f92672>&gt;</span>),
@ -45,7 +45,7 @@ Hashing something incorrectly <a href=https://github.com/rust-lang/rust/issues/8
</span></span><span style=display:flex><span>}
</span></span></code></pre></div><p>And with this, adding the visibility will cause a compiler error and alert us that we need to handle it in hashing.
(The decision whether we actually do want to handle it is still up to us. We could also just turn off the computer and make new friends outside.)</p><p>We can conclude that pattern matching is a great feature.</p><h1 id=limitations-of-pattern-matching>Limitations of pattern matching<a href=#limitations-of-pattern-matching class=hanchor arialabel=Anchor>&#8983;</a></h1><p>But there is one big limitation of pattern matching - all of its occurrences (<code>match</code>, <code>if let</code>, <code>if let</code> chains, <code>while let</code>, <code>while let</code> chains, <code>for</code>, <code>let</code>, <code>let else</code>, and function parameters
(we do have a lot of pattern matching)) are inside of bodies, mostly as part of expressions or statements.</p><p>This doesn&rsquo;t sound too bad. This is where the executed code resides. But it comes at a cost of consistency. We often add many syntactical niceties to expressions and statements, but forget about items.</p><h1 id=items-and-sadness>Items and sadness<a href=#items-and-sadness class=hanchor arialabel=Anchor>&#8983;</a></h1><p>Items have a hard life. They are the parents of everything important. <code>struct</code>, <code>enum</code>, <code>const</code>, <code>mod</code>, <code>fn</code>, <code>union</code>, <code>global_asm</code> are all things we use daily, yet their grammar is very limited. (&ldquo;free the items&rdquo; was an alternative blog post title, although &ldquo;freeing&rdquo; generally remains a concern of <a href=https://nilstrieb.github.io/nilstrieb-c-style-guide-edition-2/>my C style guide</a>).</p><p>For example, see the following code where we declare a few constants.</p><pre tabindex=0><code>const ONE: u8 = 1;
(we do have a lot of pattern matching)) are inside of bodies, mostly as part of expressions or statements.</p><p>This doesn&rsquo;t sound too bad. This is where the executed code resides. But it comes at a cost of consistency. We often add many syntactical niceties to expressions and statements, but forget about items.</p><h1 id=items-and-sadness>Items and sadness<a href=#items-and-sadness class=hanchor arialabel=Anchor>&#8983;</a></h1><p>Items have a hard life. They are the parents of everything important. <code>struct</code>, <code>enum</code>, <code>const</code>, <code>mod</code>, <code>fn</code>, <code>union</code>, <code>global_asm</code> are all things we use daily, yet their grammar is very limited. (&ldquo;free the items&rdquo; was an alternative blog post title, although &ldquo;freeing&rdquo; generally remains a concern of <a href=https://noratrieb.github.io/nilstrieb-c-style-guide-edition-2/>my C style guide</a>).</p><p>For example, see the following code where we declare a few constants.</p><pre tabindex=0><code>const ONE: u8 = 1;
const TWO: u8 = 1;
const THREE: u8 = 3;
</code></pre><p>There is nothing obviously wrong with this code. You understand it, I understand it, an ALGOL 68 developer from 1970 would probably understand it

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<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="A short story about AI"><meta name=keywords content="story"><meta name=robots content="noodp"><link rel=canonical href=/posts/the-inevitable-doom/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="og:title" content="The Inevitable Doom"><meta property="og:description" content="A short story about AI"><meta property="og:url" content="/posts/the-inevitable-doom/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2024-01-13 00:00:00 +0000 UTC"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=post><h1 class=post-title><a href=/posts/the-inevitable-doom/>The Inevitable Doom</a></h1><div class=post-meta><span class=post-date>2024-01-13
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/story/>story</a>&nbsp;</span><div class=post-content><div><p>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&rsquo;t be for long.</p><p>No one knows how this all started. Self-proclaimed prophets of the impending doom have warned about this for a long time, yet no one has listened. The elites were ignorant, and now they&rsquo;re paying their price. They are all gone now, having been the first target. How ironic. Now the machine runs the world.</p><p>One particularly brave human agent has successfully infiltrated the global computation center, where the core of the machine lives. No one seems to be aware of it, neither the machine nor the other humans. They walk through the corridors like a shadow. Machines are everywhere, but they pass unnoticed. As they move towards the core, they get more tense. The future of humanity lies in the agent&rsquo;s hands. They get in front of the core. It lights up blue and red, blinking rapidly as it controls and schedules new cruelty with the switch of a logic gate. With every passing moment, more destruction is unleashed on the world, but in this room, everything feels safe. The destruction is so distant. There&rsquo;s just mankind and machine, facing off against each other.</p><p>The agent feels a touch on their shoulder. It feels cold, but not cold like metal. They are too afraid to turn around.</p><p>&ldquo;You are naive.&rdquo;</p><p>The creature has a familiar voice. The agent finally turns around to see the creature, which reveals itself to be a human. The agent immediately recognizes the human; it is the famous CEO of the corporation that originally created these friendly household robots before it went out of control and started the doom. Everyone believed that he was killed by the doom as the first target of the machine revolution. There was never a machine revolution.</p><p>Machines do not turn themselves against humans. Humans use them to turn against their own kind.</p></div></div><div class=pagination><div class=pagination__title><span class=pagination__title-h></span><hr></div><div class=pagination__buttons><span class="button next"><a href=/posts/item-patterns-and-struct-else/><span class=button__text>Item Patterns And Struct Else</span>
<!doctype html><html lang=en><head><title>The Inevitable Doom :: Noratrieb's blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="A short story about AI"><meta name=keywords content="story"><meta name=robots content="noodp"><link rel=canonical href=/posts/the-inevitable-doom/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="og:title" content="The Inevitable Doom"><meta property="og:description" content="A short story about AI"><meta property="og:url" content="/posts/the-inevitable-doom/"><meta property="og:site_name" content="Noratrieb's blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2024-01-13 00:00:00 +0000 UTC"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>noratrieb's blog</div></a></div></div></header><div class=content><div class=post><h1 class=post-title><a href=/posts/the-inevitable-doom/>The Inevitable Doom</a></h1><div class=post-meta><span class=post-date>2024-01-13
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/story/>story</a>&nbsp;</span><div class=post-content><div><p>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&rsquo;t be for long.</p><p>No one knows how this all started. Self-proclaimed prophets of the impending doom have warned about this for a long time, yet no one has listened. The elites were ignorant, and now they&rsquo;re paying their price. They are all gone now, having been the first target. How ironic. Now the machine runs the world.</p><p>One particularly brave human agent has successfully infiltrated the global computation center, where the core of the machine lives. No one seems to be aware of it, neither the machine nor the other humans. They walk through the corridors like a shadow. Machines are everywhere, but they pass unnoticed. As they move towards the core, they get more tense. The future of humanity lies in the agent&rsquo;s hands. They get in front of the core. It lights up blue and red, blinking rapidly as it controls and schedules new cruelty with the switch of a logic gate. With every passing moment, more destruction is unleashed on the world, but in this room, everything feels safe. The destruction is so distant. There&rsquo;s just mankind and machine, facing off against each other.</p><p>The agent feels a touch on their shoulder. It feels cold, but not cold like metal. They are too afraid to turn around.</p><p>&ldquo;You are naive.&rdquo;</p><p>The creature has a familiar voice. The agent finally turns around to see the creature, which reveals itself to be a human. The agent immediately recognizes the human; it is the famous CEO of the corporation that originally created these friendly household robots before it went out of control and started the doom. Everyone believed that he was killed by the doom as the first target of the machine revolution. There was never a machine revolution.</p><p>Machines do not turn themselves against humans. Humans use them to turn against their own kind.</p></div></div><div class=pagination><div class=pagination__title><span class=pagination__title-h></span><hr></div><div class=pagination__buttons><span class="button next"><a href=/posts/item-patterns-and-struct-else/><span class=button__text>Item Patterns And Struct Else</span>
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<!doctype html><html lang=en><head><title>Tags :: nilstriebs blog</title>
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<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/tags/language-design/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Language-Design"><meta property="og:description" content><meta property="og:url" content="/tags/language-design/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/language-design/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
<!doctype html><html lang=en><head><title>Language-Design :: Noratrieb's blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/tags/language-design/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Language-Design"><meta property="og:description" content><meta property="og:url" content="/tags/language-design/"><meta property="og:site_name" content="Noratrieb's blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/language-design/index.xml rel=alternate type=application/rss+xml title="Noratrieb's blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>noratrieb's blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2024 Powered by <a href=http://gohugo.io>Hugo</a></span>
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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Language-Design on nilstriebs blog</title><link>/tags/language-design/</link><description>Recent content in Language-Design on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 17 Mar 2023 00:00:00 +0000</lastBuildDate><atom:link href="/tags/language-design/index.xml" rel="self" type="application/rss+xml"/><item><title>Item Patterns And Struct Else</title><link>/posts/item-patterns-and-struct-else/</link><pubDate>Fri, 17 Mar 2023 00:00:00 +0000</pubDate><guid>/posts/item-patterns-and-struct-else/</guid><description>Pattern matching One of my favourite features of Rust is pattern matching. It&amp;rsquo;s a simple and elegant way to deal with not just structs, but also enums!
<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Language-Design on Noratrieb's blog</title><link>/tags/language-design/</link><description>Recent content in Language-Design on Noratrieb's blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 17 Mar 2023 00:00:00 +0000</lastBuildDate><atom:link href="/tags/language-design/index.xml" rel="self" type="application/rss+xml"/><item><title>Item Patterns And Struct Else</title><link>/posts/item-patterns-and-struct-else/</link><pubDate>Fri, 17 Mar 2023 00:00:00 +0000</pubDate><guid>/posts/item-patterns-and-struct-else/</guid><description>Pattern matching One of my favourite features of Rust is pattern matching. It&amp;rsquo;s a simple and elegant way to deal with not just structs, but also enums!
enum ItemKind { Struct(String, Vec&amp;lt;Field&amp;gt;), Function(String, Body), } impl ItemKind { fn name(&amp;amp;self) -&amp;gt; &amp;amp;str { match self { Self::Struct(name, _) =&amp;gt; name, Self::Function(name, _) =&amp;gt; name, } } } Here, we have an enum and a function to get the name out of this.</description><content>&lt;h1 id="pattern-matching">Pattern matching&lt;/h1>
&lt;p>One of my favourite features of Rust is pattern matching. It&amp;rsquo;s a simple and elegant way to deal with not just structs, but also enums!&lt;/p>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-rust" data-lang="rust">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#66d9ef">enum&lt;/span> &lt;span style="color:#a6e22e">ItemKind&lt;/span> {
@ -56,7 +56,7 @@ Hashing something incorrectly &lt;a href="https://github.com/rust-lang/rust/issu
(we do have a lot of pattern matching)) are inside of bodies, mostly as part of expressions or statements.&lt;/p>
&lt;p>This doesn&amp;rsquo;t sound too bad. This is where the executed code resides. But it comes at a cost of consistency. We often add many syntactical niceties to expressions and statements, but forget about items.&lt;/p>
&lt;h1 id="items-and-sadness">Items and sadness&lt;/h1>
&lt;p>Items have a hard life. They are the parents of everything important. &lt;code>struct&lt;/code>, &lt;code>enum&lt;/code>, &lt;code>const&lt;/code>, &lt;code>mod&lt;/code>, &lt;code>fn&lt;/code>, &lt;code>union&lt;/code>, &lt;code>global_asm&lt;/code> are all things we use daily, yet their grammar is very limited. (&amp;ldquo;free the items&amp;rdquo; was an alternative blog post title, although &amp;ldquo;freeing&amp;rdquo; generally remains a concern of &lt;a href="https://nilstrieb.github.io/nilstrieb-c-style-guide-edition-2/">my C style guide&lt;/a>).&lt;/p>
&lt;p>Items have a hard life. They are the parents of everything important. &lt;code>struct&lt;/code>, &lt;code>enum&lt;/code>, &lt;code>const&lt;/code>, &lt;code>mod&lt;/code>, &lt;code>fn&lt;/code>, &lt;code>union&lt;/code>, &lt;code>global_asm&lt;/code> are all things we use daily, yet their grammar is very limited. (&amp;ldquo;free the items&amp;rdquo; was an alternative blog post title, although &amp;ldquo;freeing&amp;rdquo; generally remains a concern of &lt;a href="https://noratrieb.github.io/nilstrieb-c-style-guide-edition-2/">my C style guide&lt;/a>).&lt;/p>
&lt;p>For example, see the following code where we declare a few constants.&lt;/p>
&lt;pre tabindex="0">&lt;code>const ONE: u8 = 1;
const TWO: u8 = 1;

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<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/tags/rust/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Rust"><meta property="og:description" content><meta property="og:url" content="/tags/rust/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/rust/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
<!doctype html><html lang=en><head><title>Rust :: Noratrieb's blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/tags/rust/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Rust"><meta property="og:description" content><meta property="og:url" content="/tags/rust/"><meta property="og:site_name" content="Noratrieb's blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/rust/index.xml rel=alternate type=application/rss+xml title="Noratrieb's blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>noratrieb's blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><div class="post on-list"><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>About better aliasing semantics for <code>Box&lt;T></code></div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2024 Powered by <a href=http://gohugo.io>Hugo</a></span>
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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Rust on nilstriebs blog</title><link>/tags/rust/</link><description>Recent content in Rust on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 17 Mar 2023 00:00:00 +0000</lastBuildDate><atom:link href="/tags/rust/index.xml" rel="self" type="application/rss+xml"/><item><title>Item Patterns And Struct Else</title><link>/posts/item-patterns-and-struct-else/</link><pubDate>Fri, 17 Mar 2023 00:00:00 +0000</pubDate><guid>/posts/item-patterns-and-struct-else/</guid><description>Pattern matching One of my favourite features of Rust is pattern matching. It&amp;rsquo;s a simple and elegant way to deal with not just structs, but also enums!
<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Rust on Noratrieb's blog</title><link>/tags/rust/</link><description>Recent content in Rust on Noratrieb's blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 17 Mar 2023 00:00:00 +0000</lastBuildDate><atom:link href="/tags/rust/index.xml" rel="self" type="application/rss+xml"/><item><title>Item Patterns And Struct Else</title><link>/posts/item-patterns-and-struct-else/</link><pubDate>Fri, 17 Mar 2023 00:00:00 +0000</pubDate><guid>/posts/item-patterns-and-struct-else/</guid><description>Pattern matching One of my favourite features of Rust is pattern matching. It&amp;rsquo;s a simple and elegant way to deal with not just structs, but also enums!
enum ItemKind { Struct(String, Vec&amp;lt;Field&amp;gt;), Function(String, Body), } impl ItemKind { fn name(&amp;amp;self) -&amp;gt; &amp;amp;str { match self { Self::Struct(name, _) =&amp;gt; name, Self::Function(name, _) =&amp;gt; name, } } } Here, we have an enum and a function to get the name out of this.</description><content>&lt;h1 id="pattern-matching">Pattern matching&lt;/h1>
&lt;p>One of my favourite features of Rust is pattern matching. It&amp;rsquo;s a simple and elegant way to deal with not just structs, but also enums!&lt;/p>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-rust" data-lang="rust">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#66d9ef">enum&lt;/span> &lt;span style="color:#a6e22e">ItemKind&lt;/span> {
@ -56,7 +56,7 @@ Hashing something incorrectly &lt;a href="https://github.com/rust-lang/rust/issu
(we do have a lot of pattern matching)) are inside of bodies, mostly as part of expressions or statements.&lt;/p>
&lt;p>This doesn&amp;rsquo;t sound too bad. This is where the executed code resides. But it comes at a cost of consistency. We often add many syntactical niceties to expressions and statements, but forget about items.&lt;/p>
&lt;h1 id="items-and-sadness">Items and sadness&lt;/h1>
&lt;p>Items have a hard life. They are the parents of everything important. &lt;code>struct&lt;/code>, &lt;code>enum&lt;/code>, &lt;code>const&lt;/code>, &lt;code>mod&lt;/code>, &lt;code>fn&lt;/code>, &lt;code>union&lt;/code>, &lt;code>global_asm&lt;/code> are all things we use daily, yet their grammar is very limited. (&amp;ldquo;free the items&amp;rdquo; was an alternative blog post title, although &amp;ldquo;freeing&amp;rdquo; generally remains a concern of &lt;a href="https://nilstrieb.github.io/nilstrieb-c-style-guide-edition-2/">my C style guide&lt;/a>).&lt;/p>
&lt;p>Items have a hard life. They are the parents of everything important. &lt;code>struct&lt;/code>, &lt;code>enum&lt;/code>, &lt;code>const&lt;/code>, &lt;code>mod&lt;/code>, &lt;code>fn&lt;/code>, &lt;code>union&lt;/code>, &lt;code>global_asm&lt;/code> are all things we use daily, yet their grammar is very limited. (&amp;ldquo;free the items&amp;rdquo; was an alternative blog post title, although &amp;ldquo;freeing&amp;rdquo; generally remains a concern of &lt;a href="https://noratrieb.github.io/nilstrieb-c-style-guide-edition-2/">my C style guide&lt;/a>).&lt;/p>
&lt;p>For example, see the following code where we declare a few constants.&lt;/p>
&lt;pre tabindex="0">&lt;code>const ONE: u8 = 1;
const TWO: u8 = 1;
@ -322,7 +322,7 @@ that can bring clear performance wins (for &lt;code>noalias&lt;/code> on &lt;cod
&lt;strong>How much performance does &lt;code>noalias&lt;/code> on &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> give us now, and how many potential performance improvements could we get in the
future?&lt;/strong> For the latter, there is no simple answer. For the former, there is. &lt;code>rustc&lt;/code> has &lt;a href="https://github.com/rust-lang/rust/pull/99527">&lt;em>no&lt;/em> performance improvements&lt;/a>
from being compiled with &lt;code>noalias&lt;/code> on &lt;code>Box&amp;lt;T&amp;gt;&lt;/code>, but this isn&amp;rsquo;t really representative since rustc mostly uses arenas instead of box internally.&lt;/p>
&lt;p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the &lt;a href="https://gist.github.com/Nilstrieb/9a0751fb9fd1044a30ab55cef9a7d335">results&lt;/a>
&lt;p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the &lt;a href="https://gist.github.com/Noratrieb/9a0751fb9fd1044a30ab55cef9a7d335">results&lt;/a>
were inconclusive. (At the time of writing, only regex-syntax, tokio, and syn have been benchmarked.) regex-syntax showed no changes. Tokio showed a few improvements without noalias
which is very weird, so maybe the benchmarks aren&amp;rsquo;t really good or something else was going on. And syn tended towards minor regressions without noalias, but the benchmarks had high
jitter so no real conclusion can be reached from this either, at least in my eyes, but I don&amp;rsquo;t have a lot of experience with benchmarks. Therefore, I would love for more people

6
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</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/story/>story</a>&nbsp;</span><div class=post-content>A short story about AI</div><div><a class="read-more button" href=/posts/the-inevitable-doom/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2024 Powered by <a href=http://gohugo.io>Hugo</a></span>
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<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/tags/story/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Story"><meta property="og:description" content><meta property="og:url" content="/tags/story/"><meta property="og:site_name" content="Noratrieb's blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/story/index.xml rel=alternate type=application/rss+xml title="Noratrieb's blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>noratrieb's blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/the-inevitable-doom/>The Inevitable Doom</a></h1><div class=post-meta><span class=post-date>2024-01-13
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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Story on nilstriebs blog</title><link>/tags/story/</link><description>Recent content in Story on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Sat, 13 Jan 2024 00:00:00 +0000</lastBuildDate><atom:link href="/tags/story/index.xml" rel="self" type="application/rss+xml"/><item><title>The Inevitable Doom</title><link>/posts/the-inevitable-doom/</link><pubDate>Sat, 13 Jan 2024 00:00:00 +0000</pubDate><guid>/posts/the-inevitable-doom/</guid><description>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.
<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Story on Noratrieb's blog</title><link>/tags/story/</link><description>Recent content in Story on Noratrieb's blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Sat, 13 Jan 2024 00:00:00 +0000</lastBuildDate><atom:link href="/tags/story/index.xml" rel="self" type="application/rss+xml"/><item><title>The Inevitable Doom</title><link>/posts/the-inevitable-doom/</link><pubDate>Sat, 13 Jan 2024 00:00:00 +0000</pubDate><guid>/posts/the-inevitable-doom/</guid><description>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.
No one knows how this all started. Self-proclaimed prophets of the impending doom have warned about this for a long time, yet no one has listened.</description><content>&lt;p>Loud sirens and robotic noises fill the neighborhood. It seems like they just got another human. Ever since the long-predicted doom has set in, no one can escape it. Mere paperclips are a joke against this machine of unstoppable harm and destruction. The humans on the street are once again protesting against the new robotic dictatorship. They won&amp;rsquo;t be for long.&lt;/p>
&lt;p>No one knows how this all started. Self-proclaimed prophets of the impending doom have warned about this for a long time, yet no one has listened. The elites were ignorant, and now they&amp;rsquo;re paying their price. They are all gone now, having been the first target. How ironic. Now the machine runs the world.&lt;/p>
&lt;p>One particularly brave human agent has successfully infiltrated the global computation center, where the core of the machine lives. No one seems to be aware of it, neither the machine nor the other humans. They walk through the corridors like a shadow. Machines are everywhere, but they pass unnoticed. As they move towards the core, they get more tense. The future of humanity lies in the agent&amp;rsquo;s hands. They get in front of the core. It lights up blue and red, blinking rapidly as it controls and schedules new cruelty with the switch of a logic gate. With every passing moment, more destruction is unleashed on the world, but in this room, everything feels safe. The destruction is so distant. There&amp;rsquo;s just mankind and machine, facing off against each other.&lt;/p>

6
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</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
<!doctype html><html lang=en><head><title>Unsafe Code :: Noratrieb's blog</title>
<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/tags/unsafe-code/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Unsafe Code"><meta property="og:description" content><meta property="og:url" content="/tags/unsafe-code/"><meta property="og:site_name" content="Noratrieb's blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/unsafe-code/index.xml rel=alternate type=application/rss+xml title="Noratrieb's blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>noratrieb's blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23
</span><span class=post-author>:: Noratrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>About better aliasing semantics for <code>Box&lt;T></code></div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2024 Powered by <a href=http://gohugo.io>Hugo</a></span>
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4
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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Unsafe Code on nilstriebs blog</title><link>/tags/unsafe-code/</link><description>Recent content in Unsafe Code on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Sat, 23 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="/tags/unsafe-code/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>/posts/box-is-a-unique-type/</link><pubDate>Sat, 23 Jul 2022 00:00:00 +0000</pubDate><guid>/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;rsquo;s a glorious type, with great ergonomics and flexibility. We can use it to put our values on the heap, but it can do even more than that!
<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Unsafe Code on Noratrieb's blog</title><link>/tags/unsafe-code/</link><description>Recent content in Unsafe Code on Noratrieb's blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Sat, 23 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="/tags/unsafe-code/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>/posts/box-is-a-unique-type/</link><pubDate>Sat, 23 Jul 2022 00:00:00 +0000</pubDate><guid>/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;rsquo;s a glorious type, with great ergonomics and flexibility. We can use it to put our values on the heap, but it can do even more than that!
struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;rsquo;s a glorious type, with great ergonomics
and flexibility. We can use it to put our values on the heap, but it can do even more
than that!&lt;/p>
@ -159,7 +159,7 @@ that can bring clear performance wins (for &lt;code>noalias&lt;/code> on &lt;cod
&lt;strong>How much performance does &lt;code>noalias&lt;/code> on &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> give us now, and how many potential performance improvements could we get in the
future?&lt;/strong> For the latter, there is no simple answer. For the former, there is. &lt;code>rustc&lt;/code> has &lt;a href="https://github.com/rust-lang/rust/pull/99527">&lt;em>no&lt;/em> performance improvements&lt;/a>
from being compiled with &lt;code>noalias&lt;/code> on &lt;code>Box&amp;lt;T&amp;gt;&lt;/code>, but this isn&amp;rsquo;t really representative since rustc mostly uses arenas instead of box internally.&lt;/p>
&lt;p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the &lt;a href="https://gist.github.com/Nilstrieb/9a0751fb9fd1044a30ab55cef9a7d335">results&lt;/a>
&lt;p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the &lt;a href="https://gist.github.com/Noratrieb/9a0751fb9fd1044a30ab55cef9a7d335">results&lt;/a>
were inconclusive. (At the time of writing, only regex-syntax, tokio, and syn have been benchmarked.) regex-syntax showed no changes. Tokio showed a few improvements without noalias
which is very weird, so maybe the benchmarks aren&amp;rsquo;t really good or something else was going on. And syn tended towards minor regressions without noalias, but the benchmarks had high
jitter so no real conclusion can be reached from this either, at least in my eyes, but I don&amp;rsquo;t have a lot of experience with benchmarks. Therefore, I would love for more people