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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="Additional methods for `Ident` not provided by proc-macro2 or libproc_macro."><meta name="keywords" content="rust, rustlang, rust-lang, IdentExt"><title>IdentExt in syn::ext - 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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../syn/index.html'><div class='logo-container rust-logo'><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><div id="sidebar-vars" data-name="IdentExt" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><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><button id="copy-path" onclick="copy_path(this)">⎘</button></span><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#18-87" title="goto source code">[src]</a></span></h1><div class="docblock type-decl"><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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<!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="Additional methods for `Ident` not provided by proc-macro2 or libproc_macro."><title>IdentExt in syn::ext - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.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-46132b98.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="1.85.1 (4eb161250 2025-03-15)" data-channel="1.85.1" data-search-js="search-75f5ac3e.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.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 trait"><!--[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">2.0.100</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Ident<wbr>Ext</a></h2><h3><a href="#provided-associated-consts">Provided Associated Constants</a></h3><ul class="block"><li><a href="#associatedconstant.peek_any" title="peek_any">peek_any</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.parse_any" title="parse_any">parse_any</a></li><li><a href="#tymethod.unraw" title="unraw">unraw</a></li></ul><h3><a href="#dyn-compatibility">Dyn Compatibility</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In syn::<wbr>ext</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>::<wbr><a href="index.html">ext</a></span><h1>Trait <span class="trait">IdentExt</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/ext.rs.html#15-84">Source</a> </span></div><pre class="rust item-decl"><code>pub trait IdentExt: <a class="trait" href="https://doc.rust-lang.org/1.85.1/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">peek_any</a>: PeekFn = private::PeekFn;
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fn <a href="#tymethod.parse_any" class="fnname">parse_any</a>(input: <a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'_>) -> <a class="type" href="../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="../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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// Required methods
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fn <a href="#tymethod.parse_any" class="fn">parse_any</a>(input: <a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'_>) -> <a class="type" href="../type.Result.html" title="type syn::Result">Result</a><Self>;
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<span class="item-spacer"></span> fn <a href="#tymethod.unraw" class="fn">unraw</a>(&self) -> <a class="struct" href="../struct.Ident.html" title="struct syn::Ident">Ident</a>;
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><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 only if Syn is built with the <code>"parsing"</code> feature.</em></p>
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</div><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>const <a href="#associatedconstant.peek_any" class="constant"><b>peek_any</b></a>: PeekFn</code><a class="srclink" href="../../src/syn/ext.rs.html#57" title="goto source code">[src]</a></h3><div class="docblock"><p>Peeks any identifier including keywords. Usage:
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</div></details><h2 id="provided-associated-consts" class="section-header">Provided Associated Constants<a href="#provided-associated-consts" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedconstant.peek_any" class="method"><a class="src rightside" href="../../src/syn/ext.rs.html#54">Source</a><h4 class="code-header">const <a href="#associatedconstant.peek_any" class="constant">peek_any</a>: PeekFn = private::PeekFn</h4></section></summary><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><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>fn <a href="#tymethod.parse_any" class="fnname">parse_any</a>(input: <a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'_>) -> <a class="type" href="../parse/type.Result.html" title="type syn::parse::Result">Result</a><Self></code><a class="srclink" href="../../src/syn/ext.rs.html#49" title="goto source code">[src]</a></h3><div class="docblock"><p>Parses any identifier including keywords.</p>
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</div></details></div><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.parse_any" class="method"><a class="src rightside" href="../../src/syn/ext.rs.html#46">Source</a><h4 class="code-header">fn <a href="#tymethod.parse_any" class="fn">parse_any</a>(input: <a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'_>) -> <a class="type" href="../type.Result.html" title="type syn::Result">Result</a><Self></h4></section></summary><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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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">Error</span>, <span class="ident">Ident</span>, <span class="prelude-ty">Result</span>, <span class="ident">Token</span>};
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<span class="kw">use</span> <span class="ident">syn::ext::IdentExt</span>;
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<span class="kw">use</span> <span class="ident">syn::parse::ParseStream</span>;
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<h5 id="example"><a class="doc-anchor" href="#example">§</a>Example</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{Error, Ident, <span class="prelude-ty">Result</span>, Token};
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<span class="kw">use </span>syn::ext::IdentExt;
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<span class="kw">use </span>syn::parse::ParseStream;
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<span class="kw">mod</span> <span class="ident">kw</span> {
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<span class="macro">syn::custom_keyword!</span>(<span class="ident">name</span>);
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<span class="kw">mod </span>kw {
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<span class="macro">syn::custom_keyword!</span>(name);
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}
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<span class="comment">// Parses input that looks like `name = NAME` where `NAME` can be</span>
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<span class="comment">// any identifier.</span>
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<span class="comment">//</span>
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<span class="comment">// Examples:</span>
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<span class="comment">//</span>
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<span class="comment">// name = anything</span>
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<span class="comment">// name = impl</span>
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<span class="kw">fn</span> <span class="ident">parse_dsl</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Ident</span><span class="op">></span> {
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<span class="ident">input</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">kw::name</span><span class="op">></span>()<span class="question-mark">?</span>;
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<span class="ident">input</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="macro">Token!</span>[<span class="op">=</span>]<span class="op">></span>()<span class="question-mark">?</span>;
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<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">call</span>(<span class="ident">Ident::parse_any</span>)<span class="question-mark">?</span>;
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<span class="prelude-val">Ok</span>(<span class="ident">name</span>)
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}</pre></div>
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</div><h3 id="tymethod.unraw" class="method"><code>fn <a href="#tymethod.unraw" class="fnname">unraw</a>(&self) -> <a class="struct" href="../struct.Ident.html" title="struct syn::Ident">Ident</a></code><a class="srclink" href="../../src/syn/ext.rs.html#86" title="goto source code">[src]</a></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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<span class="comment">// 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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</span><span class="kw">fn </span>parse_dsl(input: ParseStream) -> <span class="prelude-ty">Result</span><Ident> {
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input.parse::<kw::name>()<span class="question-mark">?</span>;
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input.parse::<<span class="macro">Token!</span>[=]>()<span class="question-mark">?</span>;
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<span class="kw">let </span>name = input.call(Ident::parse_any)<span class="question-mark">?</span>;
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<span class="prelude-val">Ok</span>(name)
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}</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.unraw" class="method"><a class="src rightside" href="../../src/syn/ext.rs.html#83">Source</a><h4 class="code-header">fn <a href="#tymethod.unraw" class="fn">unraw</a>(&self) -> <a class="struct" href="../struct.Ident.html" title="struct syn::Ident">Ident</a></h4></section></summary><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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<h5 id="example-1"><a class="doc-anchor" href="#example-1">§</a>Example</h5>
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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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@@ -55,14 +51,12 @@ other language with a name that happens to be a Rust keyword.</p>
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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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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">proc_macro2::Span</span>;
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<span class="kw">use</span> <span class="ident">syn::Ident</span>;
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<span class="kw">use</span> <span class="ident">syn::ext::IdentExt</span>;
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>proc_macro2::Span;
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<span class="kw">use </span>syn::Ident;
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<span class="kw">use </span>syn::ext::IdentExt;
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<span class="kw">fn</span> <span class="ident">ident_for_getter</span>(<span class="ident">variable</span>: <span class="kw-2">&</span><span class="ident">Ident</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ident</span> {
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<span class="kw">let</span> <span class="ident">getter</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">"__pyo3_get_{}"</span>, <span class="ident">variable</span>.<span class="ident">unraw</span>());
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<span class="ident">Ident::new</span>(<span class="kw-2">&</span><span class="ident">getter</span>, <span class="ident">Span::call_site</span>())
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}</pre></div>
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</div></div><span class="loading-content">Loading content...</span><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><details class="rustdoc-toggle implementors-toggle" open><summary><h3 id="impl-IdentExt" class="impl"><code class="in-band">impl <a class="trait" href="trait.IdentExt.html" title="trait syn::ext::IdentExt">IdentExt</a> for <a class="struct" href="../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#89-105" title="goto source code">[src]</a></h3></summary><div class="impl-items"><h4 id="method.parse_any" class="method hidden trait-impl"><code>fn <a href="#tymethod.parse_any" class="fnname">parse_any</a>(input: <a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'_>) -> <a class="type" href="../parse/type.Result.html" title="type syn::parse::Result">Result</a><Self></code><a href="#method.parse_any" class="anchor"></a><a class="srclink" href="../../src/syn/ext.rs.html#90-95" title="goto source code">[src]</a></h4><h4 id="method.unraw" class="method hidden trait-impl"><code>fn <a href="#tymethod.unraw" class="fnname">unraw</a>(&self) -> <a class="struct" href="../struct.Ident.html" title="struct syn::Ident">Ident</a></code><a href="#method.unraw" class="anchor"></a><a class="srclink" href="../../src/syn/ext.rs.html#97-104" title="goto source code">[src]</a></h4></div></details></div><span class="loading-content">Loading content...</span><script type="text/javascript" src="../../implementors/syn/ext/trait.IdentExt.js" async></script></section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="syn" data-search-index-js="../../search-index.js" data-search-js="../../search.js"></div>
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<script src="../../main.js"></script></body></html>
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<span class="kw">fn </span>ident_for_getter(variable: <span class="kw-2">&</span>Ident) -> Ident {
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<span class="kw">let </span>getter = <span class="macro">format!</span>(<span class="string">"__pyo3_get_{}"</span>, variable.unraw());
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Ident::new(<span class="kw-2">&</span>getter, Span::call_site())
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}</code></pre></div>
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</div></details></div><h2 id="dyn-compatibility" class="section-header">Dyn Compatibility<a href="#dyn-compatibility" class="anchor">§</a></h2><div class="dyn-compatibility-info"><p>This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.85.1/reference/items/traits.html#object-safety">dyn compatible</a>.</p><p><i>In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.</i></p></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-IdentExt-for-Ident" class="impl"><a class="src rightside" href="../../src/syn/ext.rs.html#86-102">Source</a><a href="#impl-IdentExt-for-Ident" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.IdentExt.html" title="trait syn::ext::IdentExt">IdentExt</a> for <a class="struct" href="../struct.Ident.html" title="struct syn::Ident">Ident</a></h3></section></div><script src="../../trait.impl/syn/ext/trait.IdentExt.js" data-ignore-extern-crates="proc_macro2" async></script></section></div></main></body></html>
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