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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 `IdentExt` trait in crate `syn`."><meta name="keywords" content="rust, rustlang, rust-lang, IdentExt"><title>syn::ext::IdentExt - 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 trait"><!--[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><p class='location'>Trait IdentExt</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-const">Associated Constants</a><div class="sidebar-links"><a href="#associatedconstant.peek_any">peek_any</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.parse_any">parse_any</a><a href="#tymethod.unraw">unraw</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>syn</a>::<wbr><a href='index.html'>ext</a></p><script>window.sidebarCurrent = {name: 'IdentExt', ty: 'trait', 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/ext.rs.html#24-94' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>syn</a>::<wbr><a href='index.html'>ext</a>::<wbr><a class="trait" href=''>IdentExt</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait IdentExt: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + Sealed {
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const <a href='#associatedconstant.peek_any' class="constant"><b>peek_any</b></a>: PeekFn;
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fn <a href='#tymethod.parse_any' class='fnname'>parse_any</a>(input: <a class="type" href="../../syn/parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a>) -> <a class="type" href="../../syn/parse/type.Result.html" title="type syn::parse::Result">Result</a><Self>;
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<div class='item-spacer'></div> fn <a href='#tymethod.unraw' class='fnname'>unraw</a>(&self) -> <a class="struct" href="../../syn/struct.Ident.html" title="struct syn::Ident">Ident</a>;
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}</pre></div><div class='docblock'><p>Additional methods for <code>Ident</code> not provided by proc-macro2 or libproc_macro.</p>
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<p>This trait is sealed and cannot be implemented for types outside of Syn. It
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is implemented only for <code>proc_macro2::Ident</code>.</p>
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<p><em>This trait is available if Syn is built with the <code>"parsing"</code> feature.</em></p>
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</div>
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<h2 id='associated-const' class='small-section-header'>Associated Constants<a href='#associated-const' class='anchor'></a></h2><div class='methods'><h3 id='associatedconstant.peek_any' class='method'><code id='peek_any.v'>const <a href='#associatedconstant.peek_any' class="constant"><b>peek_any</b></a>: PeekFn</code></h3><div class='docblock'><p>Peeks any identifier including keywords. Usage:
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<code>input.peek(Ident::peek_any)</code></p>
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<p>This is different from <code>input.peek(Ident)</code> which only returns true in
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the case of an ident which is not a Rust keyword.</p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.parse_any' class='method'><code id='parse_any.v'>fn <a href='#tymethod.parse_any' class='fnname'>parse_any</a>(input: <a class="type" href="../../syn/parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a>) -> <a class="type" href="../../syn/parse/type.Result.html" title="type syn::parse::Result">Result</a><Self></code></h3><div class='docblock'><p>Parses any identifier including keywords.</p>
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<p>This is useful when parsing macro input which allows Rust keywords as
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identifiers.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<pre><code class="language-edition2018">use syn::{Error, Ident, Result, Token};
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use syn::ext::IdentExt;
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use syn::parse::ParseStream;
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mod kw {
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syn::custom_keyword!(name);
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}
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// Parses input that looks like `name = NAME` where `NAME` can be
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// any identifier.
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//
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// Examples:
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//
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// name = anything
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// name = impl
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fn parse_dsl(input: ParseStream) -> Result<Ident> {
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input.parse::<kw::name>()?;
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input.parse::<Token![=]>()?;
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let name = input.call(Ident::parse_any)?;
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Ok(name)
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}
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</code></pre>
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</div><h3 id='tymethod.unraw' class='method'><code id='unraw.v'>fn <a href='#tymethod.unraw' class='fnname'>unraw</a>(&self) -> <a class="struct" href="../../syn/struct.Ident.html" title="struct syn::Ident">Ident</a></code></h3><div class='docblock'><p>Strips the raw marker <code>r#</code>, if any, from the beginning of an ident.</p>
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<ul>
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<li>unraw(<code>x</code>) = <code>x</code></li>
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<li>unraw(<code>move</code>) = <code>move</code></li>
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<li>unraw(<code>r#move</code>) = <code>move</code></li>
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</ul>
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<h1 id="example-1" class="section-header"><a href="#example-1">Example</a></h1>
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<p>In the case of interop with other languages like Python that have a
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different set of keywords than Rust, we might come across macro input
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that involves raw identifiers to refer to ordinary variables in the
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other language with a name that happens to be a Rust keyword.</p>
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<p>The function below appends an identifier from the caller's input onto a
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fixed prefix. Without using <code>unraw()</code>, this would tend to produce
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invalid identifiers like <code>__pyo3_get_r#move</code>.</p>
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<pre><code class="language-edition2018">use proc_macro2::Span;
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use syn::Ident;
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use syn::ext::IdentExt;
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fn ident_for_getter(variable: &Ident) -> Ident {
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let getter = format!("__pyo3_get_{}", variable.unraw());
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Ident::new(&getter, Span::call_site())
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}
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</code></pre>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-IdentExt' class='impl'><code class='in-band'>impl IdentExt for <a class="struct" href="../../syn/struct.Ident.html" title="struct syn::Ident">Ident</a></code><a href='#impl-IdentExt' class='anchor'></a><a class='srclink' href='../../src/syn/ext.rs.html#96-112' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.parse_any' class="method hidden"><code id='parse_any.v-1'>fn <a href='#method.parse_any' class='fnname'>parse_any</a>(input: <a class="type" href="../../syn/parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a>) -> <a class="type" href="../../syn/parse/type.Result.html" title="type syn::parse::Result">Result</a><Self></code><a class='srclink' href='../../src/syn/ext.rs.html#97-102' title='goto source code'>[src]</a></h4><h4 id='method.unraw' class="method hidden"><code id='unraw.v-1'>fn <a href='#method.unraw' class='fnname'>unraw</a>(&self) -> <a class="struct" href="../../syn/struct.Ident.html" title="struct syn::Ident">Ident</a></code><a class='srclink' href='../../src/syn/ext.rs.html#104-111' title='goto source code'>[src]</a></h4></div></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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