syn/macro.braced.html

<!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."><title>braced in syn - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.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-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-84e720fa.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="1.89.0 (29483883e 2025-08-04)" data-channel="1.89.0" data-search-js="search-92309212.js" data-settings-js="settings-5514c975.js" ><script src="../static.files/storage-4e99c027.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-fd3af306.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-32bb7600.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.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">2.0.106</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">braced</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#example" title="Example">Example</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" title="Drag to resize sidebar"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">syn</a></div><h1>Macro <span class="macro">braced</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/group.rs.html#224-236">Source</a> </span></div><pre class="rust item-decl"><code>macro_rules! braced {
    ($content:ident in $cursor:expr) =&gt; { ... };
}</code></pre><details class="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 class="doc-anchor" href="#example">§</a>Example</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&lt;Field, <span class="macro">Token!</span>[,]&gt;,
}

<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) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>&gt; {
        <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) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>&gt; {
        <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>
</div></details></section></div></main></body></html>
deploy: `b56668540e` 2025-08-20 14:48:48 +00:00			<!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."><title>braced in syn - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.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-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-84e720fa.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="1.89.0 (29483883e 2025-08-04)" data-channel="1.89.0" data-search-js="search-92309212.js" data-settings-js="settings-5514c975.js" ><script src="../static.files/storage-4e99c027.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-fd3af306.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-32bb7600.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.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">2.0.106</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">braced</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#example" title="Example">Example</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" title="Drag to resize sidebar"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">syn</a></div><h1>Macro <span class="macro">braced</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/group.rs.html#224-236">Source</a> </span></div><pre class="rust item-decl"><code>macro_rules! braced {
deploy: `ded01cb9be` 2025-01-24 08:59:28 +00:00			`($content:ident in $cursor:expr) => { ... };`
			`}</code></pre><details class="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>`
deploy: f6ee0e7f480e3a83359852567050843c495218fd 2024-12-12 15:26:31 +00:00			`<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>`
deploy: `b388d91251` 2023-02-07 01:24:14 +00:00			`<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;`
deploy: b78a9a7a8538778ba390506f47f985ddacf0b0c3 2021-02-19 22:15:49 +00:00
deploy: `b388d91251` 2023-02-07 01:24:14 +00:00			`<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>[,]>,`
deploy: b78a9a7a8538778ba390506f47f985ddacf0b0c3 2021-02-19 22:15:49 +00:00			`}`

deploy: `b388d91251` 2023-02-07 01:24:14 +00:00			`<span class="kw">struct </span>Field {`
			`name: Ident,`
			`colon_token: <span class="macro">Token!</span>[:],`
			`ty: Type,`
deploy: b78a9a7a8538778ba390506f47f985ddacf0b0c3 2021-02-19 22:15:49 +00:00			`}`

deploy: `b388d91251` 2023-02-07 01:24:14 +00:00			`<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),`
deploy: f6ee0e7f480e3a83359852567050843c495218fd 2024-12-12 15:26:31 +00:00			`fields: content.parse_terminated(Field::parse, <span class="macro">Token!</span>[,])<span class="question-mark">?</span>,`
deploy: b78a9a7a8538778ba390506f47f985ddacf0b0c3 2021-02-19 22:15:49 +00:00			`})`
			`}`
			`}`

deploy: `b388d91251` 2023-02-07 01:24:14 +00:00			`<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>,`
deploy: b78a9a7a8538778ba390506f47f985ddacf0b0c3 2021-02-19 22:15:49 +00:00			`})`
			`}`
deploy: `825eba57df` 2021-11-20 22:06:20 +00:00			`}</code></pre></div>`
deploy: `7a5f1e9cae` 2023-11-22 13:48:01 +00:00			`</div></details></section></div></main></body></html>`