<!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="API documentation for the Rust `panicking` mod in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, panicking"><title>core::panicking - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a><p class='location'>Module panicking</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#functions">Functions</a></li></ul></div><p class='location'><a href='../index.html'>core</a></p><script>window.sidebarCurrent = {name: 'panicking', ty: 'mod', relpath: '../'};</script><script defer src="../sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Module <a href='../index.html'>core</a>::<wbr><a class="mod" href=''>panicking</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/core/panicking.rs.html#11-93' title='goto source code'>[src]</a></span></h1><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>core_panic</code>)</summary><p>internal details of the implementation of the <code>panic!</code> and related macros</p>
</details></div></div><div class='docblock'><p>Panic support for libcore</p>
<p>The core library cannot define panicking, but it does <em>declare</em> panicking. This
means that the functions inside of libcore are allowed to panic, but to be
useful an upstream crate must define panicking for libcore to use. The current
interface for panicking is:</p>
<pre class="rust rust-example-rendered">
<span class="kw">fn</span> <span class="ident">panic_impl</span>(<span class="ident">fmt</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>, <span class="ident">file_line_col</span>: <span class="kw-2">&</span>(<span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">u32</span>, <span class="ident">u32</span>)) <span class="op">-></span> <span class="op">!</span><a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Afmt%3B%0Afn%20panic_impl(fmt%3A%20fmt%3A%3AArguments%2C%20file_line_col%3A%20%26(%26'static%20str%2C%20u32%2C%20u32))%20-%3E%20!%0A%7B%20loop%20%7B%7D%20%7D%0A%7D">Run</a></pre>
<p>This definition allows for panicking with any general message, but it does not
allow for failing with a <code>Box<Any></code> value. The reason for this is that libcore
is not allowed to allocate.</p>
<p>This module contains a few other panicking functions, but these are just the
necessary lang items for the compiler. All panics are funneled through this
one function. Currently, the actual symbol is declared in the standard
library, but the location of this may change over time.</p>
</div><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
<table>
<tr class='unstable module-item'>
<td><a class="fn" href="fn.panic.html"
title='fn core::panicking::panic'>panic</a></td>
<td class='docblock-short'>
[<div class='stab unstable'>Experimental</div>]
</td>
</tr>
<tr class='unstable module-item'>
<td><a class="fn" href="fn.panic_fmt.html"
title='fn core::panicking::panic_fmt'>panic_fmt</a></td>
<td class='docblock-short'>
[<div class='stab unstable'>Experimental</div>]
</td>
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