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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 `Attribute` struct in crate `syn`."><meta name="keywords" content="rust, rustlang, rust-lang, Attribute"><title>syn::Attribute - 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><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
<link rel="alternate icon" type="image/png" href="../favicon-16x16.png">
<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 struct"><!--[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">&#9776;</div><a href='../syn/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><p class="location">Struct Attribute</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#fields">Fields</a><div class="sidebar-links"><a href="#structfield.bracket_token">bracket_token</a><a href="#structfield.path">path</a><a href="#structfield.pound_token">pound_token</a><a href="#structfield.style">style</a><a href="#structfield.tokens">tokens</a></div><a class="sidebar-title" href="#implementations">Methods</a><div class="sidebar-links"><a href="#method.parse_args">parse_args</a><a href="#method.parse_args_with">parse_args_with</a><a href="#method.parse_inner">parse_inner</a><a href="#method.parse_meta">parse_meta</a><a href="#method.parse_outer">parse_outer</a></div><a class="sidebar-title" href="#trait-implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Clone">Clone</a><a href="#impl-ToTokens">ToTokens</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-RefUnwindSafe">RefUnwindSafe</a><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">UnwindSafe</a></div><a class="sidebar-title" href="#blanket-implementations">Blanket Implementations</a><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow%3CT%3E">Borrow&lt;T&gt;</a><a href="#impl-BorrowMut%3CT%3E">BorrowMut&lt;T&gt;</a><a href="#impl-From%3CT%3E">From&lt;T&gt;</a><a href="#impl-Into%3CU%3E">Into&lt;U&gt;</a><a href="#impl-Spanned">Spanned</a><a href="#impl-ToOwned">ToOwned</a><a href="#impl-TryFrom%3CU%3E">TryFrom&lt;U&gt;</a><a href="#impl-TryInto%3CU%3E">TryInto&lt;U&gt;</a></div></div><p class="location"><a href="index.html">syn</a></p><script>window.sidebarCurrent = {name: "Attribute", ty: "struct", relpath: ""};</script><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" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><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><span class="help-button">?</span>
<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">&#x2212;</span>]</a></span><a class="srclink" href="../src/syn/attr.rs.html#11-155" title="goto source code">[src]</a></span><span class="in-band">Struct <a href="index.html">syn</a>::<wbr><a class="struct" href="">Attribute</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust struct">pub struct Attribute {
pub pound_token: <a class="struct" href="../syn/token/struct.Pound.html" title="struct syn::token::Pound">Pound</a>,
pub style: <a class="enum" href="../syn/enum.AttrStyle.html" title="enum syn::AttrStyle">AttrStyle</a>,
pub bracket_token: <a class="struct" href="../syn/token/struct.Bracket.html" title="struct syn::token::Bracket">Bracket</a>,
pub path: <a class="struct" href="../syn/struct.Path.html" title="struct syn::Path">Path</a>,
pub tokens: <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>,
}</pre></div><div class="docblock"><p>An attribute like <code>#[repr(transparent)]</code>.</p>
<p><em>This type is available only if Syn is built with the <code>&quot;derive&quot;</code> or <code>&quot;full&quot;</code>
feature.</em></p>
<br>
<h1 id="syntax" class="section-header"><a href="#syntax">Syntax</a></h1>
<p>Rust has six types of attributes.</p>
<ul>
<li>Outer attributes like <code>#[repr(transparent)]</code>. These appear outside or
in front of the item they describe.</li>
<li>Inner attributes like <code>#![feature(proc_macro)]</code>. These appear inside
of the item they describe, usually a module.</li>
<li>Outer doc comments like <code>/// # Example</code>.</li>
<li>Inner doc comments like <code>//! Please file an issue</code>.</li>
<li>Outer block comments <code>/** # Example */</code>.</li>
<li>Inner block comments <code>/*! Please file an issue */</code>.</li>
</ul>
<p>The <code>style</code> field of type <code>AttrStyle</code> distinguishes whether an attribute
is outer or inner. Doc comments and block comments are promoted to
attributes, as this is how they are processed by the compiler and by
<code>macro_rules!</code> macros.</p>
<p>The <code>path</code> field gives the possibly colon-delimited path against which
the attribute is resolved. It is equal to <code>&quot;doc&quot;</code> for desugared doc
comments. The <code>tokens</code> field contains the rest of the attribute body as
tokens.</p>
<pre><code class="language-text">#[derive(Copy)] #[crate::precondition x &lt; 5]
^^^^^^~~~~~~ ^^^^^^^^^^^^^^^^^^^ ~~~~~
path tokens path tokens
</code></pre>
<br>
<h1 id="parsing-from-tokens-to-attribute" class="section-header"><a href="#parsing-from-tokens-to-attribute">Parsing from tokens to Attribute</a></h1>
<p>This type does not implement the <a href="../syn/parse/trait.Parse.html"><code>Parse</code></a> trait and thus cannot be
parsed directly by <a href="../syn/parse/struct.ParseBuffer.html#method.parse"><code>ParseStream::parse</code></a>. Instead use
<a href="../syn/parse/struct.ParseBuffer.html#method.call"><code>ParseStream::call</code></a> with one of the two parser functions
<a href="../syn/struct.Attribute.html#method.parse_outer" title="Attribute::parse_outer"><code>Attribute::parse_outer</code></a> or <a href="../syn/struct.Attribute.html#method.parse_inner" title="Attribute::parse_inner"><code>Attribute::parse_inner</code></a> depending on
which you intend to parse.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">Attribute</span>, <span class="ident">Ident</span>, <span class="prelude-ty">Result</span>, <span class="ident">Token</span>};
<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>};
<span class="comment">// Parses a unit struct with attributes.</span>
<span class="comment">//</span>
<span class="comment">// #[path = &quot;s.tmpl&quot;]</span>
<span class="comment">// struct S;</span>
<span class="kw">struct</span> <span class="ident">UnitStruct</span> {
<span class="ident">attrs</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Attribute</span><span class="op">&gt;</span>,
<span class="ident">struct_token</span>: <span class="macro">Token</span><span class="macro">!</span>[<span class="kw">struct</span>],
<span class="ident">name</span>: <span class="ident">Ident</span>,
<span class="ident">semi_token</span>: <span class="macro">Token</span><span class="macro">!</span>[;],
}
<span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">UnitStruct</span> {
<span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span> {
<span class="prelude-val">Ok</span>(<span class="ident">UnitStruct</span> {
<span class="ident">attrs</span>: <span class="ident">input</span>.<span class="ident">call</span>(<span class="ident">Attribute</span>::<span class="ident">parse_outer</span>)<span class="question-mark">?</span>,
<span class="ident">struct_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>,
<span class="ident">name</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>,
<span class="ident">semi_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>,
})
}
}</pre></div>
<p><br></p>
<h1 id="parsing-from-attribute-to-structured-arguments" class="section-header"><a href="#parsing-from-attribute-to-structured-arguments">Parsing from Attribute to structured arguments</a></h1>
<p>The grammar of attributes in Rust is very flexible, which makes the
syntax tree not that useful on its own. In particular, arguments of the
attribute are held in an arbitrary <code>tokens: TokenStream</code>. Macros are
expected to check the <code>path</code> of the attribute, decide whether they
recognize it, and then parse the remaining tokens according to whatever
grammar they wish to require for that kind of attribute.</p>
<p>If the attribute you are parsing is expected to conform to the
conventional structured form of attribute, use <a href="../syn/struct.Attribute.html#method.parse_meta"><code>parse_meta()</code></a> to
obtain that structured representation. If the attribute follows some
other grammar of its own, use <a href="../syn/struct.Attribute.html#method.parse_args"><code>parse_args()</code></a> to parse that into the
expected data structure.</p>
<p><br></p>
<h1 id="doc-comments" class="section-header"><a href="#doc-comments">Doc comments</a></h1>
<p>The compiler transforms doc comments, such as <code>/// comment</code> and <code>/*! comment */</code>, into attributes before macros are expanded. Each comment is
expanded into an attribute of the form <code>#[doc = r&quot;comment&quot;]</code>.</p>
<p>As an example, the following <code>mod</code> items are expanded identically:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">doc</span>: <span class="ident">ItemMod</span> <span class="op">=</span> <span class="macro">parse_quote</span><span class="macro">!</span> {
<span class="doccomment">/// Single line doc comments</span>
<span class="doccomment">/// We write so many!</span>
<span class="doccomment">/**
* Multi-line comments...
* May span many lines
*/</span>
<span class="kw">mod</span> <span class="ident">example</span> {
<span class="doccomment">//! Of course, they can be inner too</span>
<span class="doccomment">/*! And fit in a single line */</span>
}
};
<span class="kw">let</span> <span class="ident">attr</span>: <span class="ident">ItemMod</span> <span class="op">=</span> <span class="macro">parse_quote</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">doc</span> <span class="op">=</span> <span class="string">r&quot; Single line doc comments&quot;</span>]</span>
<span class="attribute">#[<span class="ident">doc</span> <span class="op">=</span> <span class="string">r&quot; We write so many!&quot;</span>]</span>
<span class="attribute">#[<span class="ident">doc</span> <span class="op">=</span> <span class="string">r&quot;
* Multi-line comments...
* May span many lines
&quot;</span>]</span>
<span class="kw">mod</span> <span class="ident">example</span> {
<span class="attribute">#![<span class="ident">doc</span> <span class="op">=</span> <span class="string">r&quot; Of course, they can be inner too&quot;</span>]</span>
<span class="attribute">#![<span class="ident">doc</span> <span class="op">=</span> <span class="string">r&quot; And fit in a single line &quot;</span>]</span>
}
};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">doc</span>, <span class="ident">attr</span>);</pre></div>
</div><h2 id="fields" class="fields small-section-header">
Fields<a href="#fields" class="anchor"></a></h2><span id="structfield.pound_token" class="structfield small-section-header"><a href="#structfield.pound_token" class="anchor field"></a><code>pound_token: <a class="struct" href="../syn/token/struct.Pound.html" title="struct syn::token::Pound">Pound</a></code></span><span id="structfield.style" class="structfield small-section-header"><a href="#structfield.style" class="anchor field"></a><code>style: <a class="enum" href="../syn/enum.AttrStyle.html" title="enum syn::AttrStyle">AttrStyle</a></code></span><span id="structfield.bracket_token" class="structfield small-section-header"><a href="#structfield.bracket_token" class="anchor field"></a><code>bracket_token: <a class="struct" href="../syn/token/struct.Bracket.html" title="struct syn::token::Bracket">Bracket</a></code></span><span id="structfield.path" class="structfield small-section-header"><a href="#structfield.path" class="anchor field"></a><code>path: <a class="struct" href="../syn/struct.Path.html" title="struct syn::Path">Path</a></code></span><span id="structfield.tokens" class="structfield small-section-header"><a href="#structfield.tokens" class="anchor field"></a><code>tokens: <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a></code></span><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><h3 id="impl" class="impl"><code class="in-band">impl <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href="#impl" class="anchor"></a><a class="srclink" href="../src/syn/attr.rs.html#157-258" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.parse_meta" class="method"><code>pub fn <a href="#method.parse_meta" class="fnname">parse_meta</a>(&amp;self) -&gt; <a class="type" href="../syn/parse/type.Result.html" title="type syn::parse::Result">Result</a>&lt;<a class="enum" href="../syn/enum.Meta.html" title="enum syn::Meta">Meta</a>&gt;</code><a class="srclink" href="../src/syn/attr.rs.html#165-194" title="goto source code">[src]</a></h4><div class="docblock"><p>Parses the content of the attribute, consisting of the path and tokens,
as a <a href="../syn/enum.Meta.html" title="Meta"><code>Meta</code></a> if possible.</p>
<p><em>This function is available only if Syn is built with the <code>&quot;parsing&quot;</code>
feature.</em></p>
</div><h4 id="method.parse_args" class="method"><code>pub fn <a href="#method.parse_args" class="fnname">parse_args</a>&lt;T:&nbsp;<a class="trait" href="../syn/parse/trait.Parse.html" title="trait syn::parse::Parse">Parse</a>&gt;(&amp;self) -&gt; <a class="type" href="../syn/parse/type.Result.html" title="type syn::parse::Result">Result</a>&lt;T&gt;</code><a class="srclink" href="../src/syn/attr.rs.html#213-215" title="goto source code">[src]</a></h4><div class="docblock"><p>Parse the arguments to the attribute as a syntax tree.</p>
<p>This is similar to <code>syn::parse2::&lt;T&gt;(attr.tokens)</code> except that:</p>
<ul>
<li>the surrounding delimiters are <em>not</em> included in the input to the
parser; and</li>
<li>the error message has a more useful span when <code>tokens</code> is empty.</li>
</ul>
<pre><code class="language-text">#[my_attr(value &lt; 5)]
^^^^^^^^^ what gets parsed
</code></pre>
<p><em>This function is available only if Syn is built with the <code>&quot;parsing&quot;</code>
feature.</em></p>
</div><h4 id="method.parse_args_with" class="method"><code>pub fn <a href="#method.parse_args_with" class="fnname">parse_args_with</a>&lt;F:&nbsp;<a class="trait" href="../syn/parse/trait.Parser.html" title="trait syn::parse::Parser">Parser</a>&gt;(&amp;self, parser: F) -&gt; <a class="type" href="../syn/parse/type.Result.html" title="type syn::parse::Result">Result</a>&lt;F::<a class="type" href="../syn/parse/trait.Parser.html#associatedtype.Output" title="type syn::parse::Parser::Output">Output</a>&gt;</code><a class="srclink" href="../src/syn/attr.rs.html#223-229" title="goto source code">[src]</a></h4><div class="docblock"><p>Parse the arguments to the attribute using the given parser.</p>
<p><em>This function is available only if Syn is built with the <code>&quot;parsing&quot;</code>
feature.</em></p>
</div><h4 id="method.parse_outer" class="method"><code>pub fn <a href="#method.parse_outer" class="fnname">parse_outer</a>(input: <a class="type" href="../syn/parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a>&lt;'_&gt;) -&gt; <a class="type" href="../syn/parse/type.Result.html" title="type syn::parse::Result">Result</a>&lt;<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;Self&gt;&gt;</code><a class="srclink" href="../src/syn/attr.rs.html#237-243" title="goto source code">[src]</a></h4><div class="docblock"><p>Parses zero or more outer attributes from the stream.</p>
<p><em>This function is available only if Syn is built with the <code>&quot;parsing&quot;</code>
feature.</em></p>
</div><h4 id="method.parse_inner" class="method"><code>pub fn <a href="#method.parse_inner" class="fnname">parse_inner</a>(input: <a class="type" href="../syn/parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a>&lt;'_&gt;) -&gt; <a class="type" href="../syn/parse/type.Result.html" title="type syn::parse::Result">Result</a>&lt;<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;Self&gt;&gt;</code><a class="srclink" href="../src/syn/attr.rs.html#251-257" title="goto source code">[src]</a></h4><div class="docblock"><p>Parses zero or more inner attributes from the stream.</p>
<p><em>This function is available only if Syn is built with the <code>&quot;parsing&quot;</code>
feature.</em></p>
</div></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><h3 id="impl-Clone" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href="#impl-Clone" class="anchor"></a><a class="srclink" href="../src/syn/gen/clone.rs.html#54-64" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.clone" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone" class="fnname">clone</a>(&amp;self) -&gt; Self</code><a class="srclink" href="../src/syn/gen/clone.rs.html#55-63" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
</div><h4 id="method.clone_from" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from" class="fnname">clone_from</a>(&amp;mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>Self)</code><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/clone.rs.html#128-130" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
</div></div><h3 id="impl-ToTokens" class="impl"><code class="in-band">impl <a class="trait" href="../quote/to_tokens/trait.ToTokens.html" title="trait quote::to_tokens::ToTokens">ToTokens</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href="#impl-ToTokens" class="anchor"></a><a class="srclink" href="../src/syn/attr.rs.html#639-650" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.to_tokens" class="method hidden"><code>fn <a href="../quote/to_tokens/trait.ToTokens.html#tymethod.to_tokens" class="fnname">to_tokens</a>(&amp;self, tokens: &amp;mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</code><a class="srclink" href="../src/syn/attr.rs.html#640-649" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Write <code>self</code> to the given <code>TokenStream</code>. <a href="../quote/to_tokens/trait.ToTokens.html#tymethod.to_tokens">Read more</a></p>
</div><h4 id="method.to_token_stream" class="method hidden"><code>fn <a href="../quote/to_tokens/trait.ToTokens.html#method.to_token_stream" class="fnname">to_token_stream</a>(&amp;self) -&gt; <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#61-65" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Convert <code>self</code> directly into a <code>TokenStream</code> object. <a href="../quote/to_tokens/trait.ToTokens.html#method.to_token_stream">Read more</a></p>
</div><h4 id="method.into_token_stream" class="method hidden"><code>fn <a href="../quote/to_tokens/trait.ToTokens.html#method.into_token_stream" class="fnname">into_token_stream</a>(self) -&gt; <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#71-76" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Convert <code>self</code> directly into a <code>TokenStream</code> object. <a href="../quote/to_tokens/trait.ToTokens.html#method.into_token_stream">Read more</a></p>
</div></div></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><h3 id="impl-RefUnwindSafe" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.RefUnwindSafe.html" title="trait std::panic::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href="#impl-RefUnwindSafe" class="anchor"></a></h3><div class="impl-items"></div><h3 id="impl-Send" class="impl"><code class="in-band">impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href="#impl-Send" class="anchor"></a></h3><div class="impl-items"></div><h3 id="impl-Sync" class="impl"><code class="in-band">impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href="#impl-Sync" class="anchor"></a></h3><div class="impl-items"></div><h3 id="impl-Unpin" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href="#impl-Unpin" class="anchor"></a></h3><div class="impl-items"></div><h3 id="impl-UnwindSafe" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href="#impl-UnwindSafe" class="anchor"></a></h3><div class="impl-items"></div></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><h3 id="impl-Any" class="impl"><code class="in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></code><a href="#impl-Any" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#108-112" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.type_id" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#109-111" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
</div></div><h3 id="impl-Borrow%3CT%3E" class="impl"><code class="in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></code><a href="#impl-Borrow%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#210-214" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#211-213" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
</div></div><h3 id="impl-BorrowMut%3CT%3E" class="impl"><code class="in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></code><a href="#impl-BorrowMut%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#217-221" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow_mut" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#218-220" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
</div></div><h3 id="impl-From%3CT%3E" class="impl"><code class="in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</code><a href="#impl-From%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#552-556" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -&gt; T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#553-555" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id="impl-Into%3CU%3E" class="impl"><code class="in-band">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,&nbsp;</span></code><a href="#impl-Into%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#541-548" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -&gt; U</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#545-547" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id="impl-Spanned" class="impl"><code class="in-band">impl&lt;T&gt; <a class="trait" href="../syn/spanned/trait.Spanned.html" title="trait syn::spanned::Spanned">Spanned</a> for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: Spanned + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></code><a href="#impl-Spanned" class="anchor"></a><a class="srclink" href="../src/syn/spanned.rs.html#110-114" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.span" class="method hidden"><code>pub fn <a href="../syn/spanned/trait.Spanned.html#tymethod.span" class="fnname">span</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>Self) -&gt; <a class="struct" href="../proc_macro2/struct.Span.html" title="struct proc_macro2::Span">Span</a></code><a class="srclink" href="../src/syn/spanned.rs.html#111" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Returns a <code>Span</code> covering the complete contents of this syntax tree
node, or <a href="../proc_macro2/struct.Span.html#method.call_site"><code>Span::call_site()</code></a> if this node is empty. <a href="../syn/spanned/trait.Spanned.html#tymethod.span">Read more</a></p>
</div></div><h3 id="impl-ToOwned" class="impl"><code class="in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,&nbsp;</span></code><a href="#impl-ToOwned" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#80-92" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Owned" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="type">Owned</a> = T</code></h4><div class='docblock'><p>The resulting type after obtaining ownership.</p>
</div><h4 id="method.to_owned" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fnname">to_owned</a>(&amp;self) -&gt; T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#85-87" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></p>
</div><h4 id="method.clone_into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fnname">clone_into</a>(&amp;self, target: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>T)</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#89-91" title="goto source code">[src]</a></h4><div class="stability hidden"><div class="stab unstable"><details><summary><span class="emoji">🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code>)</summary><p>recently added</p>
</details></div></div><div class='docblock hidden'><p>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></p>
</div></div><h3 id="impl-TryFrom%3CU%3E" class="impl"><code class="in-band">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,&nbsp;</span></code><a href="#impl-TryFrom%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#589-598" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="type">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4 id="method.try_from" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#595-597" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id="impl-TryInto%3CU%3E" class="impl"><code class="in-band">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,&nbsp;</span></code><a href="#impl-TryInto%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#575-584" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error-1" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="type">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4 id="method.try_into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#581-583" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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