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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="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script></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><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.pound_token">pound_token</a><a href="#structfield.style">style</a><a href="#structfield.bracket_token">bracket_token</a><a href="#structfield.path">path</a><a href="#structfield.tts">tts</a><a href="#structfield.is_sugared_doc">is_sugared_doc</a></div><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.parse_inner">parse_inner</a><a href="#method.parse_outer">parse_outer</a><a href="#method.interpret_meta">interpret_meta</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-ToTokens">ToTokens</a><a href="#impl-Debug">Debug</a><a href="#impl-Clone">Clone</a><a href="#impl-Eq">Eq</a><a href="#impl-PartialEq">PartialEq</a><a href="#impl-Hash">Hash</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</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!"><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"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><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='in-band'>Struct <a href='index.html'>syn</a>::<wbr><a class="struct" href=''>Attribute</a></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'>&#x2212;</span>]</a></span><a class='srclink' href='../src/syn/macros.rs.html#37' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><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 tts: <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>,
    pub is_sugared_doc: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,
}</pre></div><div class='docblock'><p>An attribute like <code>#[repr(transparent)]</code>.</p>
<p><em>This type is available if Syn is built with the <code>&quot;derive&quot;</code> or <code>&quot;full&quot;</code>
feature.</em></p>
<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 that have <code>is_sugared_doc</code> set to true, 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>tts</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  tts                   path         tts
</code></pre>
<p>Use the <a href="#method.interpret_meta"><code>interpret_meta</code></a> method to try parsing the tokens of an
attribute into the structured representation that is used by convention
across most Rust libraries.</p>
</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>
                           <span id="pound_token.v" class='invisible'>
                           <code>pound_token: <a class="struct" href="../syn/token/struct.Pound.html" title="struct syn::token::Pound">Pound</a></code>
                           </span></span><span id="structfield.style" class="structfield small-section-header">
                           <a href="#structfield.style" class="anchor field"></a>
                           <span id="style.v" class='invisible'>
                           <code>style: <a class="enum" href="../syn/enum.AttrStyle.html" title="enum syn::AttrStyle">AttrStyle</a></code>
                           </span></span><span id="structfield.bracket_token" class="structfield small-section-header">
                           <a href="#structfield.bracket_token" class="anchor field"></a>
                           <span id="bracket_token.v" class='invisible'>
                           <code>bracket_token: <a class="struct" href="../syn/token/struct.Bracket.html" title="struct syn::token::Bracket">Bracket</a></code>
                           </span></span><span id="structfield.path" class="structfield small-section-header">
                           <a href="#structfield.path" class="anchor field"></a>
                           <span id="path.v" class='invisible'>
                           <code>path: <a class="struct" href="../syn/struct.Path.html" title="struct syn::Path">Path</a></code>
                           </span></span><span id="structfield.tts" class="structfield small-section-header">
                           <a href="#structfield.tts" class="anchor field"></a>
                           <span id="tts.v" class='invisible'>
                           <code>tts: <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a></code>
                           </span></span><span id="structfield.is_sugared_doc" class="structfield small-section-header">
                           <a href="#structfield.is_sugared_doc" class="anchor field"></a>
                           <span id="is_sugared_doc.v" class='invisible'>
                           <code>is_sugared_doc: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code>
                           </span></span>
                    <h2 id='methods' class='small-section-header'>
                      Methods<a href='#methods' class='anchor'></a>
                    </h2>
                <h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#410-491' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.parse_inner' class="method"><span id='parse_inner.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.parse_inner' class='fnname'>parse_inner</a>(i: <a class="struct" href="../syn/buffer/struct.Cursor.html" title="struct syn::buffer::Cursor">Cursor</a>) -&gt; <a class="type" href="../syn/synom/type.PResult.html" title="type syn::synom::PResult">PResult</a>&lt;Self&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/parsers.rs.html#74-76' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.parse_outer' class="method"><span id='parse_outer.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.parse_outer' class='fnname'>parse_outer</a>(i: <a class="struct" href="../syn/buffer/struct.Cursor.html" title="struct syn::buffer::Cursor">Cursor</a>) -&gt; <a class="type" href="../syn/synom/type.PResult.html" title="type syn::synom::PResult">PResult</a>&lt;Self&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/parsers.rs.html#74-76' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div><h3 id='impl-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href='#impl-1' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#101-186' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.interpret_meta' class="method"><span id='interpret_meta.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.interpret_meta' class='fnname'>interpret_meta</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="enum" href="../syn/enum.Meta.html" title="enum syn::Meta">Meta</a>&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#104-130' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Parses the tokens after the path as a <a href="enum.Meta.html"><code>Meta</code></a> if
possible.</p>
</div></div>
                <h2 id='implementations' class='small-section-header'>
                  Trait Implementations<a href='#implementations' class='anchor'></a>
                </h2>
                <div id='implementations-list'><h3 id='impl-ToTokens' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>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></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#525-536' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.to_tokens' class="method"><span id='to_tokens.v' class='invisible'><table class='table-display'><tbody><tr><td><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></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#526-535' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><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.into_token_stream' class="method"><span id='into_token_stream.v' class='invisible'><table class='table-display'><tbody><tr><td><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></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/quote/to_tokens.rs.html#65-72' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><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><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/macros.rs.html#35' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/macros.rs.html#35' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>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></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/macros.rs.html#36' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/macros.rs.html#36' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><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"><span id='clone_from.v' class='invisible'><table class='table-display'><tbody><tr><td><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></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#130-132' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><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-Eq' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href='#impl-Eq' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#72' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-PartialEq' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href='#impl-PartialEq' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#75-84' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>Self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#76-83' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><table class='table-display'><tbody><tr><td><code><div class="docblock attributes">#[must_use]
</div>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>Rhs) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/cmp.rs.html#123' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 id='impl-Hash' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> for <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href='#impl-Hash' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#87-99' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.hash' class="method"><span id='hash.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash' class='fnname'>hash</a>&lt;H&gt;(&amp;self, state: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>H) <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/syn/attr.rs.html#88-98' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Feeds this value into the given [<code>Hasher</code>]. <a href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash">Read more</a></p>
</div><h4 id='method.hash_slice' class="method"><span id='hash_slice.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice' class='fnname'>hash_slice</a>&lt;H&gt;(data: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;[Self]</a>, state: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>H) <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.3.0'>1.3.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/hash/mod.rs.html#203-209' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Feeds a slice of this type into the given [<code>Hasher</code>]. <a href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice">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'>
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