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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="Context for parsing a single property in the conventional syntax for structured attributes."><title>ParseNestedMeta in syn::meta - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-492a78a4a87dcc01.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="syn" data-themes="" data-resource-suffix="" data-rustdoc-version="1.82.0 (f6e511eec 2024-10-15)" data-channel="1.82.0" data-search-js="search-a99f1315e7cc5121.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-921df33f47b8780c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-3b12f09e550e0385.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../syn/index.html">syn</a><span class="version">2.0.85</span></h2></div><h2 class="location"><a href="#">Parse<wbr>Nested<wbr>Meta</a></h2><div class="sidebar-elems"><section><h3><a href="#fields">Fields</a></h3><ul class="block structfield"><li><a href="#structfield.input">input</a></li><li><a href="#structfield.path">path</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.error">error</a></li><li><a href="#method.parse_nested_meta">parse_nested_meta</a></li><li><a href="#method.value">value</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Send-for-ParseNestedMeta%3C'a%3E">!Send</a></li><li><a href="#impl-Sync-for-ParseNestedMeta%3C'a%3E">!Sync</a></li><li><a href="#impl-Freeze-for-ParseNestedMeta%3C'a%3E">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-ParseNestedMeta%3C'a%3E">RefUnwindSafe</a></li><li><a href="#impl-Unpin-for-ParseNestedMeta%3C'a%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-ParseNestedMeta%3C'a%3E">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-T">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto<U></a></li></ul></section><h2><a href="index.html">In syn::<wbr>meta</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../index.html">syn</a>::<wbr><a href="index.html">me
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pub path: <a class="struct" href="../struct.Path.html" title="struct syn::Path">Path</a>,
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pub input: <a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'a>,
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Context for parsing a single property in the conventional syntax for
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structured attributes.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<p>Refer to usage examples on the following two entry-points:</p>
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<ul>
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<li>
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<p><a href="../struct.Attribute.html#method.parse_nested_meta" title="method syn::Attribute::parse_nested_meta"><code>Attribute::parse_nested_meta</code></a> if you have an entire <code>Attribute</code> to
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parse. Always use this if possible. Generally this is able to produce
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better error messages because <code>Attribute</code> holds span information for all
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of the delimiters therein.</p>
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</li>
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<li>
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<p><a href="fn.parser.html" title="fn syn::meta::parser"><code>syn::meta::parser</code></a> if you are implementing a <code>proc_macro_attribute</code>
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macro and parsing the arguments to the attribute macro, i.e. the ones
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written in the same attribute that dispatched the macro invocation. Rustc
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does not pass span information for the surrounding delimiters into the
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attribute macro invocation in this situation, so error messages might be
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less precise.</p>
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</li>
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</ul>
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</div></details><h2 id="fields" class="fields section-header">Fields (Non-exhaustive)<a href="#fields" class="anchor">§</a></h2><details class="toggle non-exhaustive"><summary class="hideme"><span>This struct is marked as non-exhaustive</span></summary><div class="docblock">Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional <code>Struct { .. }</code> syntax; cannot be matched against without a wildcard <code>..</code>; and struct update syntax will not work.</div></details><span id="structfield.path" class="structfield section-header"><a href="#structfield.path" class="anchor field">§</a><code>path: <a class="struct" href="../struct.Path.html" title="struct syn::Path">Path</a></code></span><span id="structfield.input" class="structfield section-header"><a href="#structfield.input" class="anchor field">§</a><code>input: <a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'a></code></span><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-ParseNestedMeta%3C'a%3E" class="impl"><a class="src rightside" href="../../src/syn/meta.rs.html#169-383">source</a><a href="#impl-ParseNestedMeta%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="struct" href="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.value" class="method"><a class="src rightside" href="../../src/syn/meta.rs.html#202-205">source</a><h4 class="code-header">pub fn <a href="#method.value" class="fn">value</a>(&self) -> <a class="type" href="../parse/type.Result.html" title="type syn::parse::Result">Result</a><<a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'a>></h4></section></summary><div class="docblock"><p>Used when parsing <code>key = "value"</code> syntax.</p>
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<p>All it does is advance <code>meta.input</code> past the <code>=</code> sign in the input. You
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could accomplish the same effect by writing
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<code>meta.parse::<Token![=]>()?</code>, so at most it is a minor convenience to
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use <code>meta.value()?</code>.</p>
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<h5 id="example"><a class="doc-anchor" href="#example">§</a>Example</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{parse_quote, Attribute, LitStr};
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<span class="kw">let </span>attr: Attribute = <span class="macro">parse_quote!</span> {
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<span class="attr">#[tea(kind = <span class="string">"EarlGrey"</span>)]
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</span>};
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<span class="comment">// conceptually:
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</span><span class="kw">if </span>attr.path().is_ident(<span class="string">"tea"</span>) { <span class="comment">// this parses the `tea`
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</span>attr.parse_nested_meta(|meta| { <span class="comment">// this parses the `(`
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</span><span class="kw">if </span>meta.path.is_ident(<span class="string">"kind"</span>) { <span class="comment">// this parses the `kind`
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</span><span class="kw">let </span>value = meta.value()<span class="question-mark">?</span>; <span class="comment">// this parses the `=`
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</span><span class="kw">let </span>s: LitStr = value.parse()<span class="question-mark">?</span>; <span class="comment">// this parses `"EarlGrey"`
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</span><span class="kw">if </span>s.value() == <span class="string">"EarlGrey" </span>{
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<span class="comment">// ...
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</span>}
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<span class="prelude-val">Ok</span>(())
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} <span class="kw">else </span>{
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<span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported attribute"</span>))
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}
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})<span class="question-mark">?</span>;
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}</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.parse_nested_meta" class="method"><a class="src rightside" href="../../src/syn/meta.rs.html#271-278">source</a><h4 class="code-header">pub fn <a href="#method.parse_nested_meta" class="fn">parse_nested_meta</a>(
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&self,
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logic: impl <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="struct" href="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'_>) -> <a class="type" href="../parse/type.Result.html" title="type syn::parse::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.unit.html">()</a>>,
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) -> <a class="type" href="../parse/type.Result.html" title="type syn::parse::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.unit.html">()</a>></h4></section></summary><div class="docblock"><p>Used when parsing <code>list(...)</code> syntax <strong>if</strong> the content inside the
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nested parentheses is also expected to conform to Rust’s structured
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attribute convention.</p>
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<h5 id="example-1"><a class="doc-anchor" href="#example-1">§</a>Example</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{parse_quote, Attribute};
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<span class="kw">let </span>attr: Attribute = <span class="macro">parse_quote!</span> {
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<span class="attr">#[tea(with(sugar, milk))]
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</span>};
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<span class="kw">if </span>attr.path().is_ident(<span class="string">"tea"</span>) {
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attr.parse_nested_meta(|meta| {
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<span class="kw">if </span>meta.path.is_ident(<span class="string">"with"</span>) {
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meta.parse_nested_meta(|meta| { <span class="comment">// <---
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</span><span class="kw">if </span>meta.path.is_ident(<span class="string">"sugar"</span>) {
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<span class="comment">// Here we can go even deeper if needed.
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</span><span class="prelude-val">Ok</span>(())
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} <span class="kw">else if </span>meta.path.is_ident(<span class="string">"milk"</span>) {
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<span class="prelude-val">Ok</span>(())
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} <span class="kw">else </span>{
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<span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported ingredient"</span>))
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}
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})
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} <span class="kw">else </span>{
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<span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported tea property"</span>))
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}
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})<span class="question-mark">?</span>;
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}</code></pre></div>
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<h5 id="counterexample"><a class="doc-anchor" href="#counterexample">§</a>Counterexample</h5>
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<p>If you don’t need <code>parse_nested_meta</code>’s help in parsing the content
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written within the nested parentheses, keep in mind that you can always
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just parse it yourself from the exposed ParseStream. Rust syntax permits
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arbitrary tokens within those parentheses so for the crazier stuff,
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<code>parse_nested_meta</code> is not what you want.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{parenthesized, parse_quote, Attribute, LitInt};
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<span class="kw">let </span>attr: Attribute = <span class="macro">parse_quote!</span> {
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<span class="attr">#[repr(align(<span class="number">32</span>))]
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</span>};
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<span class="kw">let </span><span class="kw-2">mut </span>align: <span class="prelude-ty">Option</span><LitInt> = <span class="prelude-val">None</span>;
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<span class="kw">if </span>attr.path().is_ident(<span class="string">"repr"</span>) {
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attr.parse_nested_meta(|meta| {
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<span class="kw">if </span>meta.path.is_ident(<span class="string">"align"</span>) {
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<span class="kw">let </span>content;
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<span class="macro">parenthesized!</span>(content <span class="kw">in </span>meta.input);
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align = <span class="prelude-val">Some</span>(content.parse()<span class="question-mark">?</span>);
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<span class="prelude-val">Ok</span>(())
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} <span class="kw">else </span>{
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<span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported repr"</span>))
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}
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})<span class="question-mark">?</span>;
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}</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.error" class="method"><a class="src rightside" href="../../src/syn/meta.rs.html#378-382">source</a><h4 class="code-header">pub fn <a href="#method.error" class="fn">error</a>(&self, msg: impl <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a>) -> <a class="struct" href="../parse/struct.Error.html" title="struct syn::parse::Error">Error</a></h4></section></summary><div class="docblock"><p>Report that the attribute’s content did not conform to expectations.</p>
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<p>The span of the resulting error will cover <code>meta.path</code> <em>and</em> everything
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that has been parsed so far since it.</p>
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<p>There are 2 ways you might call this. First, if <code>meta.path</code> is not
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something you recognize:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code>attr.parse_nested_meta(|meta| {
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<span class="kw">if </span>meta.path.is_ident(<span class="string">"kind"</span>) {
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<span class="comment">// ...
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</span><span class="prelude-val">Ok</span>(())
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} <span class="kw">else </span>{
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<span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported tea property"</span>))
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}
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})<span class="question-mark">?</span>;</code></pre></div>
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<p>In this case, it behaves exactly like
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<code>syn::Error::new_spanned(&meta.path, "message...")</code>.</p>
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<div class="example-wrap"><pre class="language-console"><code>error: unsupported tea property
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--> src/main.rs:3:26
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|
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3 | #[tea(kind = "EarlGrey", wat = "foo")]
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| ^^^
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</code></pre></div>
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<p>More usefully, the second place is if you’ve already parsed a value but
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have decided not to accept the value:</p>
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|
|
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::Expr;
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|
|
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attr.parse_nested_meta(|meta| {
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<span class="kw">if </span>meta.path.is_ident(<span class="string">"kind"</span>) {
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<span class="kw">let </span>expr: Expr = meta.value()<span class="question-mark">?</span>.parse()<span class="question-mark">?</span>;
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<span class="kw">match </span>expr {
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Expr::Lit(expr) => <span class="comment">/* ... */
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</span>Expr::Path(expr) => <span class="comment">/* ... */
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</span>Expr::Macro(expr) => <span class="comment">/* ... */
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</span><span class="kw">_ </span>=> <span class="prelude-val">Err</span>(meta.error(<span class="string">"tea kind must be a string literal, path, or macro"</span>)),
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}
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} <span class="kw">else </span><span class="comment">/* as above */
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</span>})<span class="question-mark">?</span>;</code></pre></div>
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<div class="example-wrap"><pre class="language-console"><code>error: tea kind must be a string literal, path, or macro
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--> src/main.rs:3:7
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|
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3 | #[tea(kind = async { replicator.await })]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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</code></pre></div>
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<p>Often you may want to use <code>syn::Error::new_spanned</code> even in this
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situation. In the above code, that would be:</p>
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|
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code> <span class="kw">match </span>expr {
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Expr::Lit(expr) => <span class="comment">/* ... */
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</span>Expr::Path(expr) => <span class="comment">/* ... */
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</span>Expr::Macro(expr) => <span class="comment">/* ... */
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</span><span class="kw">_ </span>=> <span class="prelude-val">Err</span>(Error::new_spanned(expr, <span class="string">"unsupported expression type for `kind`"</span>)),
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}</code></pre></div>
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<div class="example-wrap"><pre class="language-console"><code>error: unsupported expression type for `kind`
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--> src/main.rs:3:14
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|
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3 | #[tea(kind = async { replicator.await })]
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|
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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</code></pre></div></div></details></div></details></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-ParseNestedMeta%3C'a%3E" class="impl"><a href="#impl-Freeze-for-ParseNestedMeta%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section><section id="impl-RefUnwindSafe-for-ParseNestedMeta%3C'a%3E" class="impl"><a href="#impl-RefUnwindSafe-for-ParseNestedMeta%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section><section id="impl-Send-for-ParseNestedMeta%3C'a%3E" class="impl"><a href="#impl-Send-for-ParseNestedMeta%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> !<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section><section id="impl-Sync-for-ParseNestedMeta%3C'a%3E" class="impl"><a href="#impl-Sync-for-ParseNestedMeta%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> !<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section><section id="impl-Unpin-for-ParseNestedMeta%3C'a%3E" class="impl"><a href="#impl-Unpin-for-ParseNestedMeta%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section><section id="impl-UnwindSafe-for-ParseNestedMeta%3C'a%3E" class="impl"><a href="#impl-UnwindSafe-for-ParseNestedMeta%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/any.rs.html#138">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/any.rs.html#139">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#209">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#211">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#217">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#218">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code><a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#809">source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#794">source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html>
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