<!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 `include_str` macro in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, include_str"><title>std::include_str - 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 macro"><!--[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='../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a><div class="sidebar-elems"><p class='location'><a href='index.html'>std</a></p><script>window.sidebarCurrent = {name: 'include_str', ty: 'macro', 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'>Macro <a href='index.html'>std</a>::<wbr><a class="macro" href=''>include_str</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</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/std/macros.rs.html#617-620' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">include_str</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">file</span>:<span class="ident">expr</span>) <span class="op">=></span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">file</span>:<span class="ident">expr</span>,) <span class="op">=></span> { ... };
}</pre>
</div><div class='docblock'><p>Includes a utf8-encoded file as a string.</p>
<p>The file is located relative to the current file. (similarly to how
modules are found)</p>
<p>This macro will yield an expression of type <code>&'static str</code> which is the
contents of the file.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Assume there are two files in the same directory with the following
contents:</p>
<p>File 'spanish.in':</p>
<pre><code class="language-text">adiós
</code></pre>
<p>File 'main.rs':</p>
<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">my_str</span> <span class="op">=</span> <span class="macro">include_str</span><span class="macro">!</span>(<span class="string">"spanish.in"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">my_str</span>, <span class="string">"adiós\n"</span>);
<span class="macro">print</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">my_str</span>);
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0A%20%20%20%20let%20my_str%20%3D%20include_str!(%22spanish.in%22)%3B%0A%20%20%20%20assert_eq!(my_str%2C%20%22adi%C3%B3s%5Cn%22)%3B%0A%20%20%20%20print!(%22%7B%7D%22%2C%20my_str)%3B%0A%7D">Run</a></pre>
<p>Compiling 'main.rs' and running the resulting binary will print "adiós".</p>
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