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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 `ToTokens` trait in crate `quote`."><meta name="keywords" content="rust, rustlang, rust-lang, ToTokens"><title>quote::ToTokens - 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='../quote/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Trait ToTokens</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.to_tokens">to_tokens</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.into_token_stream">into_token_stream</a><a href="#method.to_token_stream">to_token_stream</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-ToTokens-for-%26%27a%20T">&'a T</a><a href="#impl-ToTokens-for-%26%27a%20mut%20T">&'a mut T</a><a href="#impl-ToTokens-for-Box%3CT%3E">Box<T></a><a href="#impl-ToTokens-for-Cow%3C%27a%2C%20T%3E">Cow<'a, T></a><a href="#impl-ToTokens-for-Group">Group</a><a href="#impl-ToTokens-for-Ident">Ident</a><a href="#impl-ToTokens-for-Literal">Literal</a><a href="#impl-ToTokens-for-Option%3CT%3E">Option<T></a><a href="#impl-ToTokens-for-Punct">Punct</a><a href="#impl-ToTokens-for-Rc%3CT%3E">Rc<T></a><a href="#impl-ToTokens-for-String">String</a><a href="#impl-ToTokens-for-TokenStream">TokenStream</a><a href="#impl-ToTokens-for-TokenTree">TokenTree</a><a href="#impl-ToTokens-for-bool">bool</a><a href="#impl-ToTokens-for-char">char</a><a href="#impl-ToTokens-for-f32">f32</a><a href="#impl-ToTokens-for-f64">f64</a><a href="#impl-ToTokens-for-i128">i128</a><a href="#impl-ToTokens-for-i16">i16</a><a href="#impl-ToTokens-for-i32">i32</a><a href="#impl-ToTokens-for-i64">i64</a><a href="#impl-ToTokens-for-i8">i8</a><a href="#impl-ToTokens-for-isize">isize</a><a href="#impl-ToTokens-for-str">str</a><a href="#impl-ToTokens-for-u128">u128</a><a href="#impl-ToTokens-for-u16">u16</a><a href="#impl-ToTokens-for-u32">u32</a><a href="#impl-ToTokens-for-u64">u64</a><a href="#impl-ToTokens-for-u8">u8</a><a href="#impl-ToTokens-for-usize">usize</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>quote</a></p><script>window.sidebarCurrent = {name: 'ToTokens', 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" w
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fn <a href='#tymethod.to_tokens' class='fnname'>to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>);
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fn <a href='#method.to_token_stream' class='fnname'>to_token_stream</a>(&self) -> <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a> { ... }
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<div class='item-spacer'></div> fn <a href='#method.into_token_stream' class='fnname'>into_token_stream</a>(self) -> <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a><br> <span class="where">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span>,
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{ ... }
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}</pre></div><div class='docblock'><p>Types that can be interpolated inside a <code>quote!</code> invocation.</p>
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</div>
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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.to_tokens' class='method'><code id='to_tokens.v'>fn <a href='#tymethod.to_tokens' class='fnname'>to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</code></h3><div class='docblock'><p>Write <code>self</code> to the given <code>TokenStream</code>.</p>
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<p>The token append methods provided by the <a href="trait.TokenStreamExt.html"><code>TokenStreamExt</code></a> extension
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trait may be useful for implementing <code>ToTokens</code>.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<p>Example implementation for a struct representing Rust paths like
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<code>std::cmp::PartialEq</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 class="ident">TokenTree</span>, <span class="ident">Spacing</span>, <span class="ident">Span</span>, <span class="ident">Punct</span>, <span class="ident">TokenStream</span>};
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<span class="kw">use</span> <span class="ident">quote</span>::{<span class="ident">TokenStreamExt</span>, <span class="ident">ToTokens</span>};
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Path</span> {
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<span class="kw">pub</span> <span class="ident">global</span>: <span class="ident">bool</span>,
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<span class="kw">pub</span> <span class="ident">segments</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">PathSegment</span><span class="op">></span>,
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}
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<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Path</span> {
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<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
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<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">segment</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">segments</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
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<span class="kw">if</span> <span class="ident">i</span> <span class="op">></span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">global</span> {
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<span class="comment">// Double colon `::`</span>
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<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">':'</span>, <span class="ident">Spacing</span>::<span class="ident">Joint</span>));
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<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">Punct</span>::<span class="ident">new</span>(<span class="string">':'</span>, <span class="ident">Spacing</span>::<span class="ident">Alone</span>));
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}
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<span class="ident">segment</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
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}
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}
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}</pre></div>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='provided-methods' class='small-section-header'>Provided methods<a href='#provided-methods' class='anchor'></a></h2><div class='methods'><h3 id='method.to_token_stream' class='method'><code id='to_token_stream.v'>fn <a href='#method.to_token_stream' class='fnname'>to_token_stream</a>(&self) -> <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a></code></h3><div class='docblock'><p>Convert <code>self</code> directly into a <code>TokenStream</code> object.</p>
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<p>This method is implicitly implemented using <code>to_tokens</code>, and acts as a
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convenience method for consumers of the <code>ToTokens</code> trait.</p>
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</div><h3 id='method.into_token_stream' class='method'><code id='into_token_stream.v'>fn <a href='#method.into_token_stream' class='fnname'>into_token_stream</a>(self) -> <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></h3><div class='docblock'><p>Convert <code>self</code> directly into a <code>TokenStream</code> object.</p>
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<p>This method is implicitly implemented using <code>to_tokens</code>, and acts as a
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convenience method for consumers of the <code>ToTokens</code> trait.</p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='foreign-impls' class='small-section-header'>Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a></h2><h3 id='impl-ToTokens-for-%26%27a%20T' class='impl'><code class='in-band'>impl<'a, T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../quote/trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a>> <a class="trait" href="../quote/trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T</code><a href='#impl-ToTokens-for-%26%27a%20T' class='anchor'></a><a class='srclink' href='../src/quote/to_tokens.rs.html#79-83' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.to_tokens' class="method hidden"><code id='to_tokens.v-1'>fn <a href='#method.to_tokens' class='fnname'>to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</code><a class='srclink' href='../src/quote/to_tokens.rs.html#80-82' title='goto source code'>[src]</a></h4></div><h3 id='impl-ToTokens-for-%26%27a%20mut%20T' class='impl'><code class='in-band'>impl<'a, T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../quote/trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a>> <a class="trait" href="../quote/trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>T</code><a href='#impl-ToTokens-for-%26%27a%20mut%20T' class='anchor'></a><a class='srclink' href='../src/quote/to_tokens.rs.html#85-89' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.to_tokens-1' class="method hidden"><code id='to_tokens.v-2'>fn <a href='#method.to_tokens' class='fnname'>to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</code><a class='srclink' href='../src/quote/to_tokens.rs.html#86-88' title='goto source code'>[src]</a></h4></div><h3 id='impl-ToTokens-for-Cow%3C%27a%2C%20T%3E' class='impl'><code class='in-band'>impl<'a, T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> + <a class="trait" href="../quote/trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a>> <a class="trait" href="../quote/trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a> for <a class="enum" href="https://doc.rust-lang.org/nightly/alloc/borrow/enum.Cow.html" title="enum alloc::borrow::Cow">Cow</a><'a, T></code><a href='#impl-ToTokens-for-Cow%3C%27a%2C%20T%3E' class='anchor'></a><a class='srclink' href='../src/quote/to_tokens.rs.html#91-95' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.to_tokens-2' class="method hidden"><code id='to_tokens.v-3'>fn <a href='#method.to_tokens' class='fnname'>to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</code><a class='srclink' href='../src/quote/to_tokens.rs.html#92-94' title='goto source code'>[src]</a></h4></div><h3 id='impl-ToTokens-for-Box%3CT%3E' class='impl'><code class='in-band'>impl<T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../quote/trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a>> <a class="trait" href="../quote/trait.ToTokens.html"
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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'></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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src="../implementors/quote/trait.ToTokens.js">
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