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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 `Error` struct in crate `syn`."><meta name="keywords" content="rust, rustlang, rust-lang, Error"><title>syn::Error - 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 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'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Struct Error</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.combine">combine</a><a href="#method.new">new</a><a href="#method.new_spanned">new_spanned</a><a href="#method.span">span</a><a href="#method.to_compile_error">to_compile_error</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a><a href="#impl-Display">Display</a><a href="#impl-Error">Error</a><a href="#impl-From%3CLexError%3E">From&lt;LexError&gt;</a><a href="#impl-IntoIterator">IntoIterator</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-IntoIterator">IntoIterator</a><a href="#impl-ToOwned">ToOwned</a><a href="#impl-ToString">ToString</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: 'Error', 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"><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" 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/error.rs.html#86-88' title='goto source code'>[src]</a></span><span class='in-band'>Struct <a href='index.html'>syn</a>::<wbr><a class="struct" href=''>Error</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust struct'>pub struct Error { /* fields omitted */ }</pre></div><div class='docblock'><p>Error returned when a Syn parser cannot parse the input tokens.</p>
<h1 id="error-reporting-in-proc-macros" class="section-header"><a href="#error-reporting-in-proc-macros">Error reporting in proc macros</a></h1>
<p>The correct way to report errors back to the compiler from a procedural
macro is by emitting an appropriately spanned invocation of
<a href="https://doc.rust-lang.org/std/macro.compile_error.html"><code>compile_error!</code></a> in the generated code. This produces a better diagnostic
message than simply panicking the macro.</p>
<p>When parsing macro input, the <a href="../syn/macro.parse_macro_input.html" title="`parse_macro_input!`"><code>parse_macro_input!</code></a> macro handles the
conversion to <code>compile_error!</code> automatically.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">proc_macro</span>;
<span class="kw">use</span> <span class="ident">proc_macro</span>::<span class="ident">TokenStream</span>;
<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">parse_macro_input</span>, <span class="ident">AttributeArgs</span>, <span class="ident">ItemFn</span>};
<span class="attribute">#[<span class="ident">proc_macro_attribute</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">my_attr</span>(<span class="ident">args</span>: <span class="ident">TokenStream</span>, <span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">args</span> <span class="op">=</span> <span class="macro">parse_macro_input</span><span class="macro">!</span>(<span class="ident">args</span> <span class="kw">as</span> <span class="ident">AttributeArgs</span>);
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="macro">parse_macro_input</span><span class="macro">!</span>(<span class="ident">input</span> <span class="kw">as</span> <span class="ident">ItemFn</span>);
<span class="comment">/* ... */</span>
}</pre></div>
<p>For errors that arise later than the initial parsing stage, the
<a href="../syn/struct.Error.html#method.to_compile_error"><code>.to_compile_error()</code></a> method can be used to perform an explicit conversion
to <code>compile_error!</code>.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">MyDerive</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">my_derive</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="macro">parse_macro_input</span><span class="macro">!</span>(<span class="ident">input</span> <span class="kw">as</span> <span class="ident">DeriveInput</span>);
<span class="comment">// fn(DeriveInput) -&gt; syn::Result&lt;proc_macro2::TokenStream&gt;</span>
<span class="ident">expand</span>::<span class="ident">my_derive</span>(<span class="ident">input</span>)
.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">err</span>.<span class="ident">to_compile_error</span>())
.<span class="ident">into</span>()
}</pre></div>
</div><h2 id='methods' class='small-section-header'>Methods<a href='#methods' class='anchor'></a></h2><h3 id='impl' class='impl'><code class='in-band'>impl <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a></code><a href='#impl' class='anchor'></a><a class='srclink' href='../src/syn/error.rs.html#106-209' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.new' class="method"><code id='new.v'>pub fn <a href='#method.new' class='fnname'>new</a>&lt;T:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a>&gt;(span: <a class="struct" href="../proc_macro2/struct.Span.html" title="struct proc_macro2::Span">Span</a>, message: T) -&gt; Self</code><a class='srclink' href='../src/syn/error.rs.html#137-145' title='goto source code'>[src]</a></h4><div class='docblock'><p>Usually the <a href="../syn/parse/struct.ParseBuffer.html#method.error"><code>ParseStream::error</code></a> method will be used instead, which
automatically uses the correct span from the current position of the
parse stream.</p>
<p>Use <code>Error::new</code> when the error needs to be triggered on some span other
than where the parse stream is currently positioned.</p>
<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">Error</span>, <span class="ident">Ident</span>, <span class="ident">LitStr</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">ParseStream</span>;
<span class="comment">// Parses input that looks like `name = &quot;string&quot;` where the key must be</span>
<span class="comment">// the identifier `name` and the value may be any string literal.</span>
<span class="comment">// Returns the string literal.</span>
<span class="kw">fn</span> <span class="ident">parse_name</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="ident">LitStr</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">name_token</span>: <span class="ident">Ident</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="ident">name_token</span> <span class="op">!</span><span class="op">=</span> <span class="string">&quot;name&quot;</span> {
<span class="comment">// Trigger an error not on the current position of the stream,</span>
<span class="comment">// but on the position of the unexpected identifier.</span>
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">name_token</span>.<span class="ident">span</span>(), <span class="string">&quot;expected `name`&quot;</span>));
}
<span class="ident">input</span>.<span class="ident">parse</span>::<span class="op">&lt;</span><span class="macro">Token</span><span class="macro">!</span>[<span class="op">=</span>]<span class="op">&gt;</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">s</span>: <span class="ident">LitStr</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">s</span>)
}</pre></div>
</div><h4 id='method.new_spanned' class="method"><code id='new_spanned.v'>pub fn <a href='#method.new_spanned' class='fnname'>new_spanned</a>&lt;T:&nbsp;<a class="trait" href="../quote/to_tokens/trait.ToTokens.html" title="trait quote::to_tokens::ToTokens">ToTokens</a>, U:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a>&gt;(tokens: T, message: U) -&gt; Self</code><a class='srclink' href='../src/syn/error.rs.html#161-172' title='goto source code'>[src]</a></h4><div class='docblock'><p>Creates an error with the specified message spanning the given syntax
tree node.</p>
<p>Unlike the <code>Error::new</code> constructor, this constructor takes an argument
<code>tokens</code> which is a syntax tree node. This allows the resulting <code>Error</code>
to attempt to span all tokens inside of <code>tokens</code>. While you would
typically be able to use the <code>Spanned</code> trait with the above <code>Error::new</code>
constructor, implementation limitations today mean that
<code>Error::new_spanned</code> may provide a higher-quality error message on
stable Rust.</p>
<p>When in doubt it's recommended to stick to <code>Error::new</code> (or
<code>ParseStream::error</code>)!</p>
</div><h4 id='method.span' class="method"><code id='span.v'>pub fn <a href='#method.span' class='fnname'>span</a>(&amp;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/error.rs.html#179-189' title='goto source code'>[src]</a></h4><div class='docblock'><p>The source location of the error.</p>
<p>Spans are not thread-safe so this function returns <code>Span::call_site()</code>
if called from a different thread than the one on which the <code>Error</code> was
originally created.</p>
</div><h4 id='method.to_compile_error' class="method"><code id='to_compile_error.v'>pub fn <a href='#method.to_compile_error' class='fnname'>to_compile_error</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/syn/error.rs.html#197-202' title='goto source code'>[src]</a></h4><div class='docblock'><p>Render the error as an invocation of <a href="https://doc.rust-lang.org/std/macro.compile_error.html"><code>compile_error!</code></a>.</p>
<p>The <a href="../syn/macro.parse_macro_input.html" title="`parse_macro_input!`"><code>parse_macro_input!</code></a> macro provides a convenient way to invoke
this method correctly in a procedural macro.</p>
</div><h4 id='method.combine' class="method"><code id='combine.v'>pub fn <a href='#method.combine' class='fnname'>combine</a>(&amp;mut self, another: <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a>)</code><a class='srclink' href='../src/syn/error.rs.html#206-208' title='goto source code'>[src]</a></h4><div class='docblock'><p>Add another error message to self such that when <code>to_compile_error()</code> is
called, both errors will be emitted together.</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-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.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-Clone' class='anchor'></a><a class='srclink' href='../src/syn/error.rs.html#85' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.clone' class="method hidden"><code id='clone.v'>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.Error.html" title="struct syn::Error">Error</a></code><a class='srclink' href='../src/syn/error.rs.html#85' 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 id='clone_from.v'>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#131-133' 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-IntoIterator' class='impl'><code class='in-band'>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-IntoIterator' class='anchor'></a><a class='srclink' href='../src/syn/error.rs.html#309-318' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Item' class="type"><code id='Item.t'>type <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item' class="type">Item</a> = <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a></code></h4><div class='docblock'><p>The type of the elements being iterated over.</p>
</div><h4 id='associatedtype.IntoIter' class="type"><code id='IntoIter.t'>type <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter' class="type">IntoIter</a> = IntoIter</code></h4><div class='docblock'><p>Which kind of iterator are we turning this into?</p>
</div><h4 id='method.into_iter' class="method hidden"><code id='into_iter.v'>fn <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -&gt; Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" title="type core::iter::traits::collect::IntoIterator::IntoIter">IntoIter</a></code><a class='srclink' href='../src/syn/error.rs.html#313-317' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Creates an iterator from a value. <a href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter">Read more</a></p>
</div></div><h3 id='impl-IntoIterator-1' class='impl'><code class='in-band'>impl&lt;'a&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for &amp;'a <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-IntoIterator-1' class='anchor'></a><a class='srclink' href='../src/syn/error.rs.html#334-343' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Item-1' class="type"><code id='Item.t-1'>type <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item' class="type">Item</a> = <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a></code></h4><div class='docblock'><p>The type of the elements being iterated over.</p>
</div><h4 id='associatedtype.IntoIter-1' class="type"><code id='IntoIter.t-1'>type <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter' class="type">IntoIter</a> = Iter&lt;'a&gt;</code></h4><div class='docblock'><p>Which kind of iterator are we turning this into?</p>
</div><h4 id='method.into_iter-1' class="method hidden"><code id='into_iter.v-1'>fn <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -&gt; Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" title="type core::iter::traits::collect::IntoIterator::IntoIter">IntoIter</a></code><a class='srclink' href='../src/syn/error.rs.html#338-342' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Creates an iterator from a value. <a href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter">Read more</a></p>
</div></div><h3 id='impl-From%3CLexError%3E' class='impl'><code class='in-band'>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="../proc_macro2/struct.LexError.html" title="struct proc_macro2::LexError">LexError</a>&gt; for <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-From%3CLexError%3E' class='anchor'></a><a class='srclink' href='../src/syn/error.rs.html#303-307' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from' class="method hidden"><code id='from.v'>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(err: <a class="struct" href="../proc_macro2/struct.LexError.html" title="struct proc_macro2::LexError">LexError</a>) -&gt; Self</code><a class='srclink' href='../src/syn/error.rs.html#304-306' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3 id='impl-Debug' class='impl'><code class='in-band'>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.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-Debug' class='anchor'></a><a class='srclink' href='../src/syn/error.rs.html#253-267' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt' class="method hidden"><code id='fmt.v'>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, formatter: &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><a class='srclink' href='../src/syn/error.rs.html#254-266' title='goto source code'>[src]</a></h4><div class='docblock hidden'><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-Display' class='impl'><code class='in-band'>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-Display' class='anchor'></a><a class='srclink' href='../src/syn/error.rs.html#275-279' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt-1' class="method hidden"><code id='fmt.v-1'>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, formatter: &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><a class='srclink' href='../src/syn/error.rs.html#276-278' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Error' class='impl'><code class='in-band'>impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> for <a class="struct" href="../syn/struct.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-Error' class='anchor'></a><a class='srclink' href='../src/syn/error.rs.html#297-301' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.description' class="method hidden"><code id='description.v'>fn <a href='https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.description' class='fnname'>description</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><a class='srclink' href='../src/syn/error.rs.html#298-300' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>This method is soft-deprecated. <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.description">Read more</a></p>
</div><h4 id='method.cause' class="method hidden"><code id='cause.v'>fn <a href='https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.cause' class='fnname'>cause</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;&amp;dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a>&gt;</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/std/error.rs.html#134-136' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab deprecated'>Deprecated since 1.33.0: <p>replaced by Error::source, which can support downcasting</p>
</div></div><div class='docblock hidden'><p>The lower-level cause of this error, if any. <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.cause">Read more</a></p>
</div><h4 id='method.source' class="method hidden"><code id='source.v'>fn <a href='https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.source' class='fnname'>source</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;&amp;(dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> + 'static)&gt;</code><span class='since' title='Stable since Rust version 1.30.0'>1.30.0</span><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/error.rs.html#197' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>The lower-level source of this error, if any. <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.source">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-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.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-Sync' 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.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-Send' 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.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-Unpin' class='anchor'></a></h3><div class='impl-items'></div><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.Error.html" title="struct syn::Error">Error</a></code><a href='#impl-RefUnwindSafe' 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.Error.html" title="struct syn::Error">Error</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-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.rs.html#543-548' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.into' class="method hidden"><code id='into.v'>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.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-IntoIterator-2' class='impl'><code class='in-band'>impl&lt;I&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for I <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>,&nbsp;</span></code><a href='#impl-IntoIterator-2' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/iter/traits/collect.rs.html#242-249' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Item-2' class="type"><code id='Item.t-2'>type <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item' class="type">Item</a> = &lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>&gt;::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a></code></h4><div class='docblock'><p>The type of the elements being iterated over.</p>
</div><h4 id='associatedtype.IntoIter-2' class="type"><code id='IntoIter.t-2'>type <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter' class="type">IntoIter</a> = I</code></h4><div class='docblock'><p>Which kind of iterator are we turning this into?</p>
</div><h4 id='method.into_iter-2' class="method hidden"><code id='into_iter.v-2'>fn <a href='https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -&gt; I</code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/iter/traits/collect.rs.html#246-248' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Creates an iterator from a value. <a href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter">Read more</a></p>
</div></div><h3 id='impl-ToString' class='impl'><code class='in-band'>impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html" title="trait alloc::string::ToString">ToString</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/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + ?<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-ToString' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#2134-2144' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.to_string' class="method hidden"><code id='to_string.v'>default fn <a href='https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html#tymethod.to_string' class='fnname'>to_string</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#2136-2143' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Converts the given value to a <code>String</code>. <a href="https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html#tymethod.to_string">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.rs.html#552-554' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from-1' class="method hidden"><code id='from.v-1'>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.rs.html#553' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</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#81-92' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Owned' class="type"><code id='Owned.t'>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 id='to_owned.v'>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 id='clone_into.v'>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.rs.html#571-577' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error' class="type"><code id='Error.t'>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 id='try_from.v'>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.rs.html#574-576' 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.rs.html#559-566' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error-1' class="type"><code id='Error.t-1'>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 id='try_into.v'>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.rs.html#563-565' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</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#218-220' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow_mut' class="method hidden"><code id='borrow_mut.v'>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#219' 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-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#213-215' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow' class="method hidden"><code id='borrow.v'>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#214' 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-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#100-102' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.type_id' class="method hidden"><code id='type_id.v'>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#101' 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>
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