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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="Formatting macro for constructing `Ident`s."><title>format_ident in quote - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="quote" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.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">&#9776;</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../quote/index.html">quote</a><span class="version">1.0.35</span></h2></div><div class="sidebar-elems"></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../quote/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Macro <a href="index.html">quote</a>::<wbr><a class="macro" href="#">format_ident</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/quote/format.rs.html#111-125">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><span class="macro">macro_rules! </span>format_ident {
(<span class="macro-nonterminal">$fmt</span>:expr) =&gt; { ... };
(<span class="macro-nonterminal">$fmt</span>:expr, $(<span class="macro-nonterminal">$rest</span>:tt)<span class="kw-2">*</span>) =&gt; { ... };
}</pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Formatting macro for constructing <code>Ident</code>s.</p>
<br>
<h2 id="syntax"><a href="#syntax">Syntax</a></h2>
<p>Syntax is copied from the <a href="https://doc.rust-lang.org/1.76.0/alloc/macro.format.html" title="macro alloc::format"><code>format!</code></a> macro, supporting both positional and
named arguments.</p>
<p>Only a limited set of formatting traits are supported. The current mapping
of format types to traits is:</p>
<ul>
<li><code>{}</code> ⇒ <a href="trait.IdentFragment.html" title="trait quote::IdentFragment"><code>IdentFragment</code></a></li>
<li><code>{:o}</code> ⇒ <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Octal.html" title="trait core::fmt::Octal"><code>Octal</code></a></li>
<li><code>{:x}</code> ⇒ <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.LowerHex.html" title="trait core::fmt::LowerHex"><code>LowerHex</code></a></li>
<li><code>{:X}</code> ⇒ <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.UpperHex.html" title="trait core::fmt::UpperHex"><code>UpperHex</code></a></li>
<li><code>{:b}</code> ⇒ <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Binary.html" title="trait core::fmt::Binary"><code>Binary</code></a></li>
</ul>
<p>See <a href="https://doc.rust-lang.org/1.76.0/alloc/fmt/index.html" title="mod alloc::fmt"><code>std::fmt</code></a> for more information.</p>
<br>
<h2 id="identfragment"><a href="#identfragment">IdentFragment</a></h2>
<p>Unlike <code>format!</code>, this macro uses the <a href="trait.IdentFragment.html" title="trait quote::IdentFragment"><code>IdentFragment</code></a> formatting trait by
default. This trait is like <code>Display</code>, with a few differences:</p>
<ul>
<li><code>IdentFragment</code> is only implemented for a limited set of types, such as
unsigned integers and strings.</li>
<li><a href="../proc_macro2/struct.Ident.html" title="struct proc_macro2::Ident"><code>Ident</code></a> arguments will have their <code>r#</code> prefixes stripped, if present.</li>
</ul>
<br>
<h2 id="hygiene"><a href="#hygiene">Hygiene</a></h2>
<p>The <a href="../proc_macro2/struct.Span.html" title="struct proc_macro2::Span"><code>Span</code></a> of the first <code>Ident</code> argument is used as the span of the final
identifier, falling back to <a href="../proc_macro2/struct.Span.html#method.call_site" title="associated function proc_macro2::Span::call_site"><code>Span::call_site</code></a> when no identifiers are
provided.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// If `ident` is an Ident, the span of `my_ident` will be inherited from it.
</span><span class="kw">let </span>my_ident = <span class="macro">format_ident!</span>(<span class="string">"My{}{}"</span>, ident, <span class="string">"IsCool"</span>);
<span class="macro">assert_eq!</span>(my_ident, <span class="string">"MyIdentIsCool"</span>);</code></pre></div>
<p>Alternatively, the span can be overridden by passing the <code>span</code> named
argument.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>my_span = <span class="comment">/* ... */</span>;
<span class="macro">format_ident!</span>(<span class="string">"MyIdent"</span>, span = my_span);</code></pre></div>
<p><br></p>
<h2 id="panics"><a href="#panics">Panics</a></h2>
<p>This method will panic if the resulting formatted string is not a valid
identifier.</p>
<br>
<h2 id="examples"><a href="#examples">Examples</a></h2>
<p>Composing raw and non-raw identifiers:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>my_ident = <span class="macro">format_ident!</span>(<span class="string">"My{}"</span>, <span class="string">"Ident"</span>);
<span class="macro">assert_eq!</span>(my_ident, <span class="string">"MyIdent"</span>);
<span class="kw">let </span>raw = <span class="macro">format_ident!</span>(<span class="string">"r#Raw"</span>);
<span class="macro">assert_eq!</span>(raw, <span class="string">"r#Raw"</span>);
<span class="kw">let </span>my_ident_raw = <span class="macro">format_ident!</span>(<span class="string">"{}Is{}"</span>, my_ident, raw);
<span class="macro">assert_eq!</span>(my_ident_raw, <span class="string">"MyIdentIsRaw"</span>);</code></pre></div>
<p>Integer formatting options:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>num: u32 = <span class="number">10</span>;
<span class="kw">let </span>decimal = <span class="macro">format_ident!</span>(<span class="string">"Id_{}"</span>, num);
<span class="macro">assert_eq!</span>(decimal, <span class="string">"Id_10"</span>);
<span class="kw">let </span>octal = <span class="macro">format_ident!</span>(<span class="string">"Id_{:o}"</span>, num);
<span class="macro">assert_eq!</span>(octal, <span class="string">"Id_12"</span>);
<span class="kw">let </span>binary = <span class="macro">format_ident!</span>(<span class="string">"Id_{:b}"</span>, num);
<span class="macro">assert_eq!</span>(binary, <span class="string">"Id_1010"</span>);
<span class="kw">let </span>lower_hex = <span class="macro">format_ident!</span>(<span class="string">"Id_{:x}"</span>, num);
<span class="macro">assert_eq!</span>(lower_hex, <span class="string">"Id_a"</span>);
<span class="kw">let </span>upper_hex = <span class="macro">format_ident!</span>(<span class="string">"Id_{:X}"</span>, num);
<span class="macro">assert_eq!</span>(upper_hex, <span class="string">"Id_A"</span>);</code></pre></div>
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