| <!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."><meta name="keywords" content="rust, rustlang, rust-lang, ParseNestedMeta"><title>ParseNestedMeta in syn::meta - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin 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class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">ParseNestedMeta</a></h2><div class="sidebar-elems"><section><h3><a href="#fields">Fields</a></h3><ul class="block"><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"><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"><li><a href="#impl-RefUnwindSafe-for-ParseNestedMeta%3C%27a%3E">!RefUnwindSafe</a></li><li><a href="#impl-Send-for-ParseNestedMeta%3C%27a%3E">!Send</a></li><li><a href="#impl-Sync-for-ParseNestedMeta%3C%27a%3E">!Sync</a></li><li><a href="#impl-Unpin-for-ParseNestedMeta%3C%27a%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-ParseNestedMeta%3C%27a%3E">!UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-ParseNestedMeta%3C%27a%3E">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-ParseNestedMeta%3C%27a%3E">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-ParseNestedMeta%3C%27a%3E">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-ParseNestedMeta%3C%27a%3E">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-ParseNestedMeta%3C%27a%3E">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-ParseNestedMeta%3C%27a%3E">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-ParseNestedMeta%3C%27a%3E">TryInto<U></a></li></ul></section><h2><a href="index.html">In syn::meta</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Struct <a href="../index.html">syn</a>::<wbr><a href="index.html">meta</a>::<wbr><a class="struct" href="#">ParseNestedMeta</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../../src/syn/meta.rs.html#163-166">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust struct"><code><div class="code-attribute">#[non_exhaustive]</div>pub struct ParseNestedMeta<'a> { |
| pub path: <a class="struct" href="../struct.Path.html" title="struct syn::Path">Path</a>, |
| pub input: <a class="type" href="../parse/type.ParseStream.html" title="type syn::parse::ParseStream">ParseStream</a><'a>, |
| }</code></pre></div><details class="rustdoc-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 |
| structured attributes.</p> |
| <h2 id="examples"><a href="#examples">Examples</a></h2> |
| <p>Refer to usage examples on the following two entry-points:</p> |
| <ul> |
| <li> |
| <p><a href="../struct.Attribute.html#method.parse_nested_meta"><code>Attribute::parse_nested_meta</code></a> if you have an entire <code>Attribute</code> to |
| parse. Always use this if possible. Generally this is able to produce |
| better error messages because <code>Attribute</code> holds span information for all |
| of the delimiters therein.</p> |
| </li> |
| <li> |
| <p><a href="fn.parser.html"><code>syn::meta::parser</code></a> if you are implementing a <code>proc_macro_attribute</code> |
| macro and parsing the arguments to the attribute macro, i.e. the ones |
| written in the same attribute that dispatched the macro invocation. Rustc |
| does not pass span information for the surrounding delimiters into the |
| attribute macro invocation in this situation, so error messages might be |
| less precise.</p> |
| </li> |
| </ul> |
| </div></details><h2 id="fields" class="fields small-section-header">Fields (Non-exhaustive)<a href="#fields" class="anchor"></a></h2><details class="rustdoc-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 small-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 small-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="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><div id="implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/syn/meta.rs.html#168-382">source</a><a href="#impl-ParseNestedMeta%3C%27a%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="rustdoc-toggle method-toggle" open><summary><section id="method.value" class="method has-srclink"><a class="srclink rightside" href="../../src/syn/meta.rs.html#201-204">source</a><h4 class="code-header">pub fn <a href="#method.value" class="fnname">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> |
| <p>All it does is advance <code>meta.input</code> past the <code>=</code> sign in the input. You |
| could accomplish the same effect by writing |
| <code>meta.parse::<Token![=]>()?</code>, so at most it is a minor convenience to |
| use <code>meta.value()?</code>.</p> |
| <h5 id="example"><a href="#example">Example</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{parse_quote, Attribute, LitStr}; |
| |
| <span class="kw">let </span>attr: Attribute = <span class="macro">parse_quote! </span>{ |
| <span class="attribute">#[tea(kind = <span class="string">"EarlGrey"</span>)] |
| </span>}; |
| <span class="comment">// conceptually: |
| </span><span class="kw">if </span>attr.path().is_ident(<span class="string">"tea"</span>) { <span class="comment">// this parses the `tea` |
| </span>attr.parse_nested_meta(|meta| { <span class="comment">// this parses the `(` |
| </span><span class="kw">if </span>meta.path.is_ident(<span class="string">"kind"</span>) { <span class="comment">// this parses the `kind` |
| </span><span class="kw">let </span>value = meta.value()<span class="question-mark">?</span>; <span class="comment">// this parses the `=` |
| </span><span class="kw">let </span>s: LitStr = value.parse()<span class="question-mark">?</span>; <span class="comment">// this parses `"EarlGrey"` |
| </span><span class="kw">if </span>s.value() == <span class="string">"EarlGrey" </span>{ |
| <span class="comment">// ... |
| </span>} |
| <span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported attribute"</span>)) |
| } |
| })<span class="question-mark">?</span>; |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.parse_nested_meta" class="method has-srclink"><a class="srclink rightside" href="../../src/syn/meta.rs.html#270-277">source</a><h4 class="code-header">pub fn <a href="#method.parse_nested_meta" class="fnname">parse_nested_meta</a>(<br> &self,<br> logic: impl <a class="trait" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.unit.html">()</a>><br>) -> <a class="type" href="../parse/type.Result.html" title="type syn::parse::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/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 |
| nested parentheses is also expected to conform to Rust’s structured |
| attribute convention.</p> |
| <h5 id="example-1"><a href="#example-1">Example</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{parse_quote, Attribute}; |
| |
| <span class="kw">let </span>attr: Attribute = <span class="macro">parse_quote! </span>{ |
| <span class="attribute">#[tea(with(sugar, milk))] |
| </span>}; |
| |
| <span class="kw">if </span>attr.path().is_ident(<span class="string">"tea"</span>) { |
| attr.parse_nested_meta(|meta| { |
| <span class="kw">if </span>meta.path.is_ident(<span class="string">"with"</span>) { |
| meta.parse_nested_meta(|meta| { <span class="comment">// <--- |
| </span><span class="kw">if </span>meta.path.is_ident(<span class="string">"sugar"</span>) { |
| <span class="comment">// Here we can go even deeper if needed. |
| </span><span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else if </span>meta.path.is_ident(<span class="string">"milk"</span>) { |
| <span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported ingredient"</span>)) |
| } |
| }) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported tea property"</span>)) |
| } |
| })<span class="question-mark">?</span>; |
| }</code></pre></div> |
| <h5 id="counterexample"><a href="#counterexample">Counterexample</a></h5> |
| <p>If you don’t need <code>parse_nested_meta</code>’s help in parsing the content |
| written within the nested parentheses, keep in mind that you can always |
| just parse it yourself from the exposed ParseStream. Rust syntax permits |
| arbitrary tokens within those parentheses so for the crazier stuff, |
| <code>parse_nested_meta</code> is not what you want.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::{parenthesized, parse_quote, Attribute, LitInt}; |
| |
| <span class="kw">let </span>attr: Attribute = <span class="macro">parse_quote! </span>{ |
| <span class="attribute">#[repr(align(<span class="number">32</span>))] |
| </span>}; |
| |
| <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>; |
| <span class="kw">if </span>attr.path().is_ident(<span class="string">"repr"</span>) { |
| attr.parse_nested_meta(|meta| { |
| <span class="kw">if </span>meta.path.is_ident(<span class="string">"align"</span>) { |
| <span class="kw">let </span>content; |
| <span class="macro">parenthesized!</span>(content <span class="kw">in </span>meta.input); |
| align = <span class="prelude-val">Some</span>(content.parse()<span class="question-mark">?</span>); |
| <span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported repr"</span>)) |
| } |
| })<span class="question-mark">?</span>; |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.error" class="method has-srclink"><a class="srclink rightside" href="../../src/syn/meta.rs.html#377-381">source</a><h4 class="code-header">pub fn <a href="#method.error" class="fnname">error</a>(&self, msg: impl <a class="trait" href="https://doc.rust-lang.org/nightly/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> |
| <p>The span of the resulting error will cover <code>meta.path</code> <em>and</em> everything |
| that has been parsed so far since it.</p> |
| <p>There are 2 ways you might call this. First, if <code>meta.path</code> is not |
| something you recognize:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code>attr.parse_nested_meta(|meta| { |
| <span class="kw">if </span>meta.path.is_ident(<span class="string">"kind"</span>) { |
| <span class="comment">// ... |
| </span><span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(meta.error(<span class="string">"unsupported tea property"</span>)) |
| } |
| })<span class="question-mark">?</span>;</code></pre></div> |
| <p>In this case, it behaves exactly like |
| <code>syn::Error::new_spanned(&meta.path, "message...")</code>.</p> |
| <div class="example-wrap"><pre class="language-console"><code>error: unsupported tea property |
| --> src/main.rs:3:26 |
| | |
| 3 | #[tea(kind = "EarlGrey", wat = "foo")] |
| | ^^^</code></pre></div> |
| <p>More usefully, the second place is if you’ve already parsed a value but |
| have decided not to accept the value:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>syn::Expr; |
| |
| attr.parse_nested_meta(|meta| { |
| <span class="kw">if </span>meta.path.is_ident(<span class="string">"kind"</span>) { |
| <span class="kw">let </span>expr: Expr = meta.value()<span class="question-mark">?</span>.parse()<span class="question-mark">?</span>; |
| <span class="kw">match </span>expr { |
| Expr::Lit(expr) => <span class="comment">/* ... */ |
| </span>Expr::Path(expr) => <span class="comment">/* ... */ |
| </span>Expr::Macro(expr) => <span class="comment">/* ... */ |
| </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>)), |
| } |
| } <span class="kw">else </span><span class="comment">/* as above */ |
| |
| </span>})<span class="question-mark">?</span>;</code></pre></div> |
| <div class="example-wrap"><pre class="language-console"><code>error: tea kind must be a string literal, path, or macro |
| --> src/main.rs:3:7 |
| | |
| 3 | #[tea(kind = async { replicator.await })] |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^</code></pre></div> |
| <p>Often you may want to use <code>syn::Error::new_spanned</code> even in this |
| situation. In the above code, that would be:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code> <span class="kw">match </span>expr { |
| Expr::Lit(expr) => <span class="comment">/* ... */ |
| </span>Expr::Path(expr) => <span class="comment">/* ... */ |
| </span>Expr::Macro(expr) => <span class="comment">/* ... */ |
| </span><span class="kw">_ </span>=> <span class="prelude-val">Err</span>(Error::new_spanned(expr, <span class="string">"unsupported expression type for `kind`"</span>)), |
| }</code></pre></div> |
| <div class="example-wrap"><pre class="language-console"><code>error: unsupported expression type for `kind` |
| --> src/main.rs:3:14 |
| | |
| 3 | #[tea(kind = async { replicator.await })] |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^</code></pre></div></div></details></div></details></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"><section id="impl-RefUnwindSafe-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> !<a class="trait" href="https://doc.rust-lang.org/nightly/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%27a%3E" class="impl has-srclink"><a href="#impl-Send-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> !<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="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section><section id="impl-Sync-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a href="#impl-Sync-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> !<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="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section><section id="impl-Unpin-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a href="#impl-Unpin-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> <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="struct.ParseNestedMeta.html" title="struct syn::meta::ParseNestedMeta">ParseNestedMeta</a><'a></h3></section><section id="impl-UnwindSafe-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a href="#impl-UnwindSafe-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> !<a class="trait" href="https://doc.rust-lang.org/nightly/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="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#200">source</a><a href="#impl-Any-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T> <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> T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#201">source</a><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/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/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#211">source</a><a href="#impl-Borrow%3CT%3E-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#213">source</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#220">source</a><a href="#impl-BorrowMut%3CT%3E-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#221">source</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</h4></section></summary><div class='docblock'>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></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#733">source</a><a href="#impl-From%3CT%3E-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#736">source</a></span><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#717">source</a><a href="#impl-Into%3CU%3E-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#725">source</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p> |
| <p>That is, this conversion is whatever the implementation of |
| <code><a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="From">From</a><T> for U</code> chooses to do.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#775">source</a><a href="#impl-TryFrom%3CU%3E-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/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="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#781">source</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/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="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-ParseNestedMeta%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#760">source</a><a href="#impl-TryInto%3CU%3E-for-ParseNestedMeta%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/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="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#766">source</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/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><div id="rustdoc-vars" data-root-path="../../" data-current-crate="syn" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
