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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="Quasi-quotation macro that accepts input like the `quote!` macro but uses type inference to figure out a return type for those tokens."><title>parse_quote in syn - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.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-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-b0742ba02757f159.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="syn" data-themes="" data-resource-suffix="" data-rustdoc-version="1.83.0 (90b35a623 2024-11-26)" data-channel="1.83.0" data-search-js="search-f0d225181b97f9a4.js" data-settings-js="settings-805db61a62df4bd2.js" ><script src="../static.files/storage-1d39b6787ed640ff.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-f070b9041d14864c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-0111fcff984fae8f.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc macro"><!--[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="../syn/index.html">syn</a><span class="version">2.0.90</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">parse_<wbr>quote</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#example" title="Example">Example</a></li><li><a href="#special-cases" title="Special cases">Special cases</a></li><li><a href="#panics" title="Panics">Panics</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate syn</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">syn</a></span><h1>Macro <span class="macro">parse_quote</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/syn/parse_quote.rs.html#69-73">source</a> </span></div><pre class="rust item-decl"><span class="macro">macro_rules!</span> parse_quote {
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($(<span class="macro-nonterminal">$tt</span>:tt)<span class="kw-2">*</span>) => { ... };
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}</pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Quasi-quotation macro that accepts input like the <a href="https://docs.rs/quote/1.0/quote/index.html"><code>quote!</code></a> macro but uses
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type inference to figure out a return type for those tokens.</p>
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<p>The return type can be any syntax tree node that implements the <a href="parse/trait.Parse.html" title="trait syn::parse::Parse"><code>Parse</code></a>
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trait.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>quote::quote;
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<span class="kw">use </span>syn::{parse_quote, Stmt};
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<span class="kw">fn </span>main() {
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<span class="kw">let </span>name = <span class="macro">quote!</span>(v);
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<span class="kw">let </span>ty = <span class="macro">quote!</span>(u8);
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<span class="kw">let </span>stmt: Stmt = <span class="macro">parse_quote!</span> {
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<span class="kw">let </span>#name: #ty = Default::default();
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};
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<span class="macro">println!</span>(<span class="string">"{:#?}"</span>, stmt);
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}</code></pre></div>
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<p><em>This macro is available only if Syn is built with both the <code>"parsing"</code> and
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<code>"printing"</code> features.</em></p>
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<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
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<p>The following helper function adds a bound <code>T: HeapSize</code> to every type
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parameter <code>T</code> in the input generics.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{parse_quote, Generics, GenericParam};
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<span class="comment">// Add a bound `T: HeapSize` to every type parameter T.
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</span><span class="kw">fn </span>add_trait_bounds(<span class="kw-2">mut </span>generics: Generics) -> Generics {
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<span class="kw">for </span>param <span class="kw">in </span><span class="kw-2">&mut </span>generics.params {
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<span class="kw">if let </span>GenericParam::Type(type_param) = param {
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type_param.bounds.push(<span class="macro">parse_quote!</span>(HeapSize));
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}
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}
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generics
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}</code></pre></div>
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<h2 id="special-cases"><a class="doc-anchor" href="#special-cases">§</a>Special cases</h2>
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<p>This macro can parse the following additional types as a special case even
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though they do not implement the <code>Parse</code> trait.</p>
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<ul>
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<li><a href="struct.Attribute.html" title="struct syn::Attribute"><code>Attribute</code></a> — parses one attribute, allowing either outer like <code>#[...]</code>
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or inner like <code>#![...]</code></li>
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<li><a href="punctuated/struct.Punctuated.html" title="struct syn::punctuated::Punctuated"><code>Punctuated<T, P></code></a> — parses zero or more <code>T</code> separated by punctuation
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<code>P</code> with optional trailing punctuation</li>
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<li><a href="struct.Block.html#method.parse_within" title="associated function syn::Block::parse_within"><code>Vec<Stmt></code></a> — parses the same as <code>Block::parse_within</code></li>
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</ul>
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<h2 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h2>
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<p>Panics if the tokens fail to parse as the expected syntax tree type. The
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caller is responsible for ensuring that the input tokens are syntactically
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valid.</p>
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</div></details></section></div></main></body></html>
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