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<!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 `quote` crate."><meta name="keywords" content="rust, rustlang, rust-lang, quote"><title>quote - 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="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></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='../quote/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><p class="location">Crate quote</p><div class="block version"><p>Version 1.0.8</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all quote's items</p></a><div class="block items"><ul><li><a href="#macros">Macros</a></li><li><a href="#traits">Traits</a></li></ul></div><p class="location"></p><script>window.sidebarCurrent = {name: "quote", ty: "mod", relpath: "../"};</script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><span class="help-button">?</span>
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<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="out-of-band"><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/quote/lib.rs.html#1-1262" title="goto source code">[src]</a></span><span class="in-band">Crate <a class="mod" href="">quote</a></span></h1><div class="docblock"><p><a href="https://github.com/dtolnay/quote"><img src="https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github" alt="github" /></a> <a href="https://crates.io/crates/quote"><img src="https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust" alt="crates-io" /></a> <a href="https://docs.rs/quote"><img src="https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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" alt="docs-rs" /></a></p>
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<br>
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<p>This crate provides the <a href="macro.quote.html"><code>quote!</code></a> macro for turning Rust syntax tree data
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structures into tokens of source code.</p>
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<p>Procedural macros in Rust receive a stream of tokens as input, execute
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arbitrary Rust code to determine how to manipulate those tokens, and produce
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a stream of tokens to hand back to the compiler to compile into the caller's
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crate. Quasi-quoting is a solution to one piece of that — producing
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tokens to return to the compiler.</p>
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<p>The idea of quasi-quoting is that we write <em>code</em> that we treat as <em>data</em>.
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Within the <code>quote!</code> macro, we can write what looks like code to our text
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editor or IDE. We get all the benefits of the editor's brace matching,
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syntax highlighting, indentation, and maybe autocompletion. But rather than
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compiling that as code into the current crate, we can treat it as data, pass
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it around, mutate it, and eventually hand it back to the compiler as tokens
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to compile into the macro caller's crate.</p>
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<p>This crate is motivated by the procedural macro use case, but is a
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general-purpose Rust quasi-quoting library and is not specific to procedural
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macros.</p>
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<pre><code class="language-toml">[dependencies]
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quote = "1.0"
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</code></pre>
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<br>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<p>The following quasi-quoted block of code is something you might find in <a href="https://serde.rs/">a</a>
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procedural macro having to do with data structure serialization. The <code>#var</code>
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syntax performs interpolation of runtime variables into the quoted tokens.
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Check out the documentation of the <a href="macro.quote.html"><code>quote!</code></a> macro for more detail about
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the syntax. See also the <a href="macro.quote_spanned.html"><code>quote_spanned!</code></a> macro which is important for
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implementing hygienic procedural macros.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote</span><span class="macro">!</span> {
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<span class="kw">struct</span> <span class="ident">SerializeWith</span> #<span class="ident">generics</span> #<span class="ident">where_clause</span> {
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<span class="ident">value</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> #<span class="ident">field_ty</span>,
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<span class="ident">phantom</span>: <span class="ident">core</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span><span class="op"><</span>#<span class="ident">item_ty</span><span class="op">></span>,
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}
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<span class="kw">impl</span> #<span class="ident">generics</span> <span class="ident">serde</span>::<span class="ident">Serialize</span> <span class="kw">for</span> <span class="ident">SerializeWith</span> #<span class="ident">generics</span> #<span class="ident">where_clause</span> {
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<span class="kw">fn</span> <span class="ident">serialize</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">serializer</span>: <span class="ident">S</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">S</span>::<span class="prelude-val">Ok</span>, <span class="ident">S</span>::<span class="ident">Error</span><span class="op">></span>
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<span class="kw">where</span>
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<span class="ident">S</span>: <span class="ident">serde</span>::<span class="ident">Serializer</span>,
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{
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#<span class="ident">path</span>(<span class="self">self</span>.<span class="ident">value</span>, <span class="ident">serializer</span>)
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}
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}
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<span class="ident">SerializeWith</span> {
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<span class="ident">value</span>: #<span class="ident">value</span>,
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<span class="ident">phantom</span>: <span class="ident">core</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>::<span class="op"><</span>#<span class="ident">item_ty</span><span class="op">></span>,
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}
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};</pre></div>
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</div><h2 id="macros" class="section-header"><a href="#macros">Macros</a></h2>
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<table><tr class="module-item"><td><a class="macro" href="macro.format_ident.html" title="quote::format_ident macro">format_ident</a></td><td class="docblock-short"><p>Formatting macro for constructing <code>Ident</code>s.</p>
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</td></tr><tr class="module-item"><td><a class="macro" href="macro.quote.html" title="quote::quote macro">quote</a></td><td class="docblock-short"><p>The whole point.</p>
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</td></tr><tr class="module-item"><td><a class="macro" href="macro.quote_spanned.html" title="quote::quote_spanned macro">quote_spanned</a></td><td class="docblock-short"><p>Same as <code>quote!</code>, but applies a given span to all tokens originating within
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the macro invocation.</p>
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</td></tr></table><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2>
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<table><tr class="module-item"><td><a class="trait" href="trait.IdentFragment.html" title="quote::IdentFragment trait">IdentFragment</a></td><td class="docblock-short"><p>Specialized formatting trait used by <code>format_ident!</code>.</p>
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</td></tr><tr class="module-item"><td><a class="trait" href="trait.ToTokens.html" title="quote::ToTokens trait">ToTokens</a></td><td class="docblock-short"><p>Types that can be interpolated inside a <code>quote!</code> invocation.</p>
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</td></tr><tr class="module-item"><td><a class="trait" href="trait.TokenStreamExt.html" title="quote::TokenStreamExt trait">TokenStreamExt</a></td><td class="docblock-short"><p>TokenStream extension trait with methods for appending tokens.</p>
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</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><script>window.rootPath = "../";window.currentCrate = "quote";</script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
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