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<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></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>
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<section id='main' class="content">
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<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'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/syn/macros.rs.html#37' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct Attribute {
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pub pound_token: <a class="struct" href="../syn/token/struct.Pound.html" title="struct syn::token::Pound">Pound</a>,
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pub style: <a class="enum" href="../syn/enum.AttrStyle.html" title="enum syn::AttrStyle">AttrStyle</a>,
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pub bracket_token: <a class="struct" href="../syn/token/struct.Bracket.html" title="struct syn::token::Bracket">Bracket</a>,
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pub path: <a class="struct" href="../syn/struct.Path.html" title="struct syn::Path">Path</a>,
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pub tts: <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>,
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pub is_sugared_doc: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,
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}</pre><div class='docblock'><p>An attribute like <code>#[repr(transparent)]</code>.</p>
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<p><em>This type is available if Syn is built with the <code>"derive"</code> or <code>"full"</code>
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feature.</em></p>
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<h1 id="syntax" class="section-header"><a href="#syntax">Syntax</a></h1>
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<p>Rust has six types of attributes.</p>
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<ul>
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<li>Outer attributes like <code>#[repr(transparent)]</code>. These appear outside or
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in front of the item they describe.</li>
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<li>Inner attributes like <code>#![feature(proc_macro)]</code>. These appear inside
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of the item they describe, usually a module.</li>
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<li>Outer doc comments like <code>/// # Example</code>.</li>
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<li>Inner doc comments like <code>//! Please file an issue</code>.</li>
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<li>Outer block comments <code>/** # Example */</code>.</li>
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<li>Inner block comments <code>/*! Please file an issue */</code>.</li>
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</ul>
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<p>The <code>style</code> field of type <code>AttrStyle</code> distinguishes whether an attribute
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is outer or inner. Doc comments and block comments are promoted to
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attributes that have <code>is_sugared_doc</code> set to true, as this is how they
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are processed by the compiler and by <code>macro_rules!</code> macros.</p>
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<p>The <code>path</code> field gives the possibly colon-delimited path against which
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the attribute is resolved. It is equal to <code>"doc"</code> for desugared doc
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comments. The <code>tts</code> field contains the rest of the attribute body as
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tokens.</p>
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<pre><code class="language-text">#[derive(Copy)] #[crate::precondition x < 5]
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^^^^^^~~~~~~ ^^^^^^^^^^^^^^^^^^^ ~~~~~
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path tts path tts
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</code></pre>
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<p>Use the <a href="#method.interpret_meta"><code>interpret_meta</code></a> method to try parsing the tokens of an
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attribute into the structured representation that is used by convention
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across most Rust libraries.</p>
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</div><h2 id='fields' class='fields small-section-header'>
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Fields<a href='#fields' class='anchor'></a></h2><span id="structfield.pound_token" class="structfield small-section-header">
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<a href="#structfield.pound_token" class="anchor field"></a>
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<span id="pound_token.v" class='invisible'>
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<code>pound_token: <a class="struct" href="../syn/token/struct.Pound.html" title="struct syn::token::Pound">Pound</a></code>
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</span></span><span id="structfield.style" class="structfield small-section-header">
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<a href="#structfield.style" class="anchor field"></a>
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<span id="style.v" class='invisible'>
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<code>style: <a class="enum" href="../syn/enum.AttrStyle.html" title="enum syn::AttrStyle">AttrStyle</a></code>
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</span></span><span id="structfield.bracket_token" class="structfield small-section-header">
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<a href="#structfield.bracket_token" class="anchor field"></a>
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<span id="bracket_token.v" class='invisible'>
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<code>bracket_token: <a class="struct" href="../syn/token/struct.Bracket.html" title="struct syn::token::Bracket">Bracket</a></code>
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</span></span><span id="structfield.path" class="structfield small-section-header">
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<a href="#structfield.path" class="anchor field"></a>
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<span id="path.v" class='invisible'>
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<code>path: <a class="struct" href="../syn/struct.Path.html" title="struct syn::Path">Path</a></code>
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</span></span><span id="structfield.tts" class="structfield small-section-header">
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<a href="#structfield.tts" class="anchor field"></a>
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<span id="tts.v" class='invisible'>
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<code>tts: <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a></code>
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</span></span><span id="structfield.is_sugared_doc" class="structfield small-section-header">
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<a href="#structfield.is_sugared_doc" class="anchor field"></a>
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<span id="is_sugared_doc.v" class='invisible'>
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<code>is_sugared_doc: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code>
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</span></span>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><code>impl <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code><a href='#impl' class='anchor'></a></span><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></h3>
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<div class='impl-items'><h4 id='method.parse_inner' class="method"><span id='parse_inner.v' class='invisible'><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>) -> <a class="type" href="../syn/synom/type.PResult.html" title="type syn::synom::PResult">PResult</a><Self></code></span><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></span></h4>
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<h4 id='method.parse_outer' class="method"><span id='parse_outer.v' class='invisible'><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>) -> <a class="type" href="../syn/synom/type.PResult.html" title="type syn::synom::PResult">PResult</a><Self></code></span><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></span></h4>
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</div><h3 id='impl-1' class='impl'><span class='in-band'><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><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></h3>
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<div class='impl-items'><h4 id='method.interpret_meta' class="method"><span id='interpret_meta.v' class='invisible'><code>pub fn <a href='#method.interpret_meta' class='fnname'>interpret_meta</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="enum" href="../syn/enum.Meta.html" title="enum syn::Meta">Meta</a>></code></span><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></span></h4>
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<div class='docblock'><p>Parses the tokens after the path as a <a href="enum.Meta.html"><code>Meta</code></a> if
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possible.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<h3 id='impl-ToTokens' class='impl'><span class='in-band'><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><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></h3>
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<div class='impl-items'><h4 id='method.to_tokens' class="method"><span id='to_tokens.v' class='invisible'><code>fn <a href='../quote/to_tokens/trait.ToTokens.html#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></span><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></span></h4>
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<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'><code>fn <a href='../quote/to_tokens/trait.ToTokens.html#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></code></span><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></span></h4>
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<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>
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</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><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><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></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><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></h4>
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<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>
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</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><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><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></h3>
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<div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../syn/struct.Attribute.html" title="struct syn::Attribute">Attribute</a></code></span><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></h4>
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<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>
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</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span><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#112-114' title='goto source code'>[src]</a></span></h4>
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<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>
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</div></div><h3 id='impl-Eq' class='impl'><span class='in-band'><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><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></h3>
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<div class='impl-items'></div><h3 id='impl-PartialEq' class='impl'><span class='in-band'><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><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></h3>
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<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><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></span></h4>
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<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'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Rhs) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><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#121' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>This method tests for <code>!=</code>.</p>
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</div></div><h3 id='impl-Hash' class='impl'><span class='in-band'><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><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></h3>
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<div class='impl-items'><h4 id='method.hash' class="method"><span id='hash.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash' class='fnname'>hash</a><H>(&self, state: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>H) <span class="where fmt-newline">where<br> H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>, </span></code></span><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></span></h4>
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<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>
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</div><h4 id='method.hash_slice' class="method"><span id='hash_slice.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice' class='fnname'>hash_slice</a><H>(data: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[Self]</a>, state: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>H) <span class="where fmt-newline">where<br> H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>, </span></code></span><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#202-208' title='goto source code'>[src]</a></span></h4>
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<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>
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