<!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` macro in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, include"><title>std::include - Rust</title><link rel="stylesheet" type="text/css" href="../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../light1.35.0.css" id="themeStyle"><script src="../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow1.35.0.svg");}</style></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='../rust-logo1.35.0.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', 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="../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><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#898-901' title='goto source code'>[src]</a></span><span class='in-band'>Macro <a href='index.html'>std</a>::<wbr><a class="macro" href=''>include</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><div class="example-wrap"><pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">include</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><div class='docblock'><p>Parses a file as an expression or an item according to the context.</p>
<p>The file is located relative to the current file (similarly to how
modules are found).</p>
<p>Using this macro is often a bad idea, because if the file is
parsed as an expression, it is going to be placed in the
surrounding code unhygienically. This could result in variables
or functions being different from what the file expected if
there are variables or functions that have the same name in
the current 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 'monkeys.in':</p>
<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><div class="example-wrap"><pre class="rust rust-example-rendered ignore">
[<span class="string">'🙈'</span>, <span class="string">'🙊'</span>, <span class="string">'🙉'</span>]
.<span class="ident">iter</span>()
.<span class="ident">cycle</span>()
.<span class="ident">take</span>(<span class="number">6</span>)
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">String</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%0A%5B'%F0%9F%99%88'%2C%20'%F0%9F%99%8A'%2C%20'%F0%9F%99%89'%5D%0A%20%20%20%20.iter()%0A%20%20%20%20.cycle()%0A%20%20%20%20.take(6)%0A%20%20%20%20.collect%3A%3A%3CString%3E()%0A%7D">Run</a></pre></div>
<p>File 'main.rs':</p>
<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><div class="example-wrap"><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_string</span> <span class="op">=</span> <span class="macro">include</span><span class="macro">!</span>(<span class="string">"monkeys.in"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"🙈🙊🙉🙈🙊🙉"</span>, <span class="ident">my_string</span>);
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">my_string</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_string%20%3D%20include!(%22monkeys.in%22)%3B%0A%20%20%20%20assert_eq!(%22%F0%9F%99%88%F0%9F%99%8A%F0%9F%99%89%F0%9F%99%88%F0%9F%99%8A%F0%9F%99%89%22%2C%20my_string)%3B%0A%20%20%20%20println!(%22%7B%7D%22%2C%20my_string)%3B%0A%7D">Run</a></pre></div>
<p>Compiling 'main.rs' and running the resulting binary will print
"🙈🙊🙉🙈🙊🙉".</p>
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