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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 `parse_macro_input` macro in crate `syn`."><meta name="keywords" content="rust, rustlang, rust-lang, parse_macro_input"><title>syn::parse_macro_input - 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="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.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='../syn/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='index.html'>syn</a></p><script>window.sidebarCurrent = {name: 'parse_macro_input', 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="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.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="../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/syn/parse_macro_input.rs.html#40-52' title='goto source code'>[src]</a></span><span class='in-band'>Macro <a href='index.html'>syn</a>::<wbr><a class="macro" href=''>parse_macro_input</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><div class="example-wrap"><pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">parse_macro_input</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokenstream</span>:<span class="ident">ident</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokenstream</span>:<span class="ident">ident</span>) <span class="op">=</span><span class="op">></span> { ... };
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}</pre></div>
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</div><div class='docblock'><p>Parse the input TokenStream of a macro, triggering a compile error if the
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tokens fail to parse.</p>
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<p>Refer to the <a href="parse/index.html"><code>parse</code> module</a> documentation for more details about parsing
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in Syn.</p>
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<h1 id="intended-usage" class="section-header"><a href="#intended-usage">Intended usage</a></h1>
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<pre><code class="language-edition2018">extern crate proc_macro;
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use proc_macro::TokenStream;
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use syn::{parse_macro_input, Result};
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use syn::parse::{Parse, ParseStream};
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struct MyMacroInput {
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/* ... */
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}
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impl Parse for MyMacroInput {
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fn parse(input: ParseStream) -> Result<Self> {
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/* ... */
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# Ok(MyMacroInput {})
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}
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}
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# const IGNORE: &str = stringify! {
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#[proc_macro]
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# };
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pub fn my_macro(tokens: TokenStream) -> TokenStream {
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let input = parse_macro_input!(tokens as MyMacroInput);
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/* ... */
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# "".parse().unwrap()
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}
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</code></pre>
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