28 lines
5.0 KiB
HTML
28 lines
5.0 KiB
HTML
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Panics by concatenating the argument slice."><title>concat_panic in const_panic - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="const_panic" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../const_panic/index.html">const_<wbr>panic</a><span class="version">0.2.10</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">concat_<wbr>panic</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#example" title="Example">Example</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate const_<wbr>panic</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">const_panic</a></span><h1>Function <span class="fn">concat_panic</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/const_panic/concat_panic_.rs.html#46-66">Source</a> </span></div><pre class="rust item-decl"><code>pub const fn concat_panic(args: &[&[<a class="struct" href="struct.PanicVal.html" title="struct const_panic::PanicVal">PanicVal</a><'_>]]) -> <a class="primitive" href="https://doc.rust-lang.org/1.84.0/core/primitive.never.html">!</a></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Panics by concatenating the argument slice.</p>
|
||
<p>This is the function that the <a href="macro.concat_panic.html" title="macro const_panic::concat_panic"><code>concat_panic</code></a> macro calls to panic.</p>
|
||
<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
|
||
<p>Here’s how to panic with formatting without using any macros:</p>
|
||
|
||
<div class="example-wrap compile_fail"><a href="#" class="tooltip" title="This example deliberately fails to compile">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">use </span>const_panic::{FmtArg, PanicVal, concat_panic};
|
||
|
||
<span class="kw">const _</span>: () = concat_panic(<span class="kw-2">&</span>[<span class="kw-2">&</span>[
|
||
PanicVal::write_str(<span class="string">"\nthe error was "</span>),
|
||
PanicVal::from_u8(<span class="number">100</span>, FmtArg::DISPLAY),
|
||
PanicVal::write_str(<span class="string">" and "</span>),
|
||
PanicVal::from_str(<span class="string">"\nHello\tworld"</span>, FmtArg::DEBUG),
|
||
]]);
|
||
|
||
</code></pre></div>
|
||
<p>That fails to compile with this error message:</p>
|
||
<div class="example-wrap"><pre class="language-text"><code>error[E0080]: evaluation of constant value failed
|
||
--> src/concat_panic_.rs:13:15
|
||
|
|
||
6 | const _: () = concat_panic(&[&[
|
||
| _______________^
|
||
7 | | PanicVal::write_str("\nthe error was "),
|
||
8 | | PanicVal::from_u8(100, FmtArg::DISPLAY),
|
||
9 | | PanicVal::write_str(" and "),
|
||
10 | | PanicVal::from_str("\nHello\tworld", FmtArg::DEBUG),
|
||
11 | | ]]);
|
||
| |___^ the evaluated program panicked at '
|
||
the error was 100 and "\nHello\tworld"', src/concat_panic_.rs:6:15</code></pre></div></div></details></section></div></main></body></html> |