| <!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="Parse a set of curly braces and expose their content to subsequent parsers."><meta name="keywords" content="rust, rustlang, rust-lang, braced"><title>braced in syn - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../normalize.css"><link rel="stylesheet" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../ayu.css" disabled><link rel="stylesheet" href="../dark.css" disabled><link rel="stylesheet" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.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">☰</button><a class="sidebar-logo" href="../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2><a href="index.html">In syn</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Macro <a href="index.html">syn</a>::<wbr><a class="macro" href="#">braced</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../src/syn/group.rs.html#216-228">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><div class="example-wrap"><pre class="rust macro"><code><span class="macro">macro_rules! </span>braced { |
| (<span class="macro-nonterminal">$content</span>:ident <span class="kw">in </span><span class="macro-nonterminal">$cursor</span>:expr) => { ... }; |
| }</code></pre></div> |
| </div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Parse a set of curly braces and expose their content to subsequent parsers.</p> |
| <h2 id="example"><a href="#example">Example</a></h2> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{braced, token, Ident, <span class="prelude-ty">Result</span>, Token, Type}; |
| <span class="kw">use </span>syn::parse::{Parse, ParseStream}; |
| <span class="kw">use </span>syn::punctuated::Punctuated; |
| |
| <span class="comment">// Parse a simplified struct syntax like: |
| // |
| // struct S { |
| // a: A, |
| // b: B, |
| // } |
| </span><span class="kw">struct </span>Struct { |
| struct_token: <span class="macro">Token!</span>[<span class="kw">struct</span>], |
| ident: Ident, |
| brace_token: token::Brace, |
| fields: Punctuated<Field, <span class="macro">Token!</span>[,]>, |
| } |
| |
| <span class="kw">struct </span>Field { |
| name: Ident, |
| colon_token: <span class="macro">Token!</span>[:], |
| ty: Type, |
| } |
| |
| <span class="kw">impl </span>Parse <span class="kw">for </span>Struct { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>content; |
| <span class="prelude-val">Ok</span>(Struct { |
| struct_token: input.parse()<span class="question-mark">?</span>, |
| ident: input.parse()<span class="question-mark">?</span>, |
| brace_token: <span class="macro">braced!</span>(content <span class="kw">in </span>input), |
| fields: content.parse_terminated(Field::parse, <span class="macro">Token!</span>[,])<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>Parse <span class="kw">for </span>Field { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(Field { |
| name: input.parse()<span class="question-mark">?</span>, |
| colon_token: input.parse()<span class="question-mark">?</span>, |
| ty: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| }</code></pre></div> |
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