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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="A reference to [span data] and the associated registry."><title>SpanRef in tracing_subscriber::registry - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><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">&#9776;</button><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing_subscriber/index.html">tracing_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">SpanRef</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.extensions">extensions</a></li><li><a href="#method.extensions_mut">extensions_mut</a></li><li><a href="#method.fields">fields</a></li><li><a href="#method.id">id</a></li><li><a href="#method.metadata">metadata</a></li><li><a href="#method.name">name</a></li><li><a href="#method.parent">parent</a></li><li><a href="#method.scope">scope</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-SpanRef%3C'a,+R%3E">Debug</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-RefUnwindSafe-for-SpanRef%3C'a,+R%3E">RefUnwindSafe</a></li><li><a href="#impl-Send-for-SpanRef%3C'a,+R%3E">Send</a></li><li><a href="#impl-Sync-for-SpanRef%3C'a,+R%3E">Sync</a></li><li><a href="#impl-Unpin-for-SpanRef%3C'a,+R%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-SpanRef%3C'a,+R%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&lt;T&gt;</a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut&lt;T&gt;</a></li><li><a href="#impl-From%3CT%3E-for-T">From&lt;T&gt;</a></li><li><a href="#impl-Instrument-for-T">Instrument</a></li><li><a href="#impl-Into%3CU%3E-for-T">Into&lt;U&gt;</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom&lt;U&gt;</a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto&lt;U&gt;</a></li><li><a href="#impl-WithSubscriber-for-T">WithSubscriber</a></li></ul></section><h2><a href="index.html">In tracing_subscriber::registry</a></h2></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../tracing_subscriber/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../index.html">tracing_subscriber</a>::<wbr><a href="index.html">registry</a>::<wbr><a class="struct" href="#">SpanRef</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/tracing_subscriber/registry/mod.rs.html#208-214">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub struct SpanRef&lt;'a, R: <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt; { <span class="comment">/* private fields */</span> }</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A reference to [span data] and the associated <a href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">registry</a>.</p>
<p>This type implements all the same methods as <a href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData"><code>SpanData</code></a>, and provides
additional methods for querying the registry based on values from the span.</p>
</div></details><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-SpanRef%3C'a,+R%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#336-513">source</a><a href="#impl-SpanRef%3C'a,+R%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, R&gt; <a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, R&gt;<div class="where">where
R: <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.id" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#341-343">source</a><h4 class="code-header">pub fn <a href="#method.id" class="fn">id</a>(&amp;self) -&gt; <a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a></h4></section></summary><div class="docblock"><p>Returns this spans ID.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.metadata" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#346-348">source</a><h4 class="code-header">pub fn <a href="#method.metadata" class="fn">metadata</a>(&amp;self) -&gt; &amp;'static <a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'static&gt;</h4></section></summary><div class="docblock"><p>Returns a static reference to the spans metadata.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.name" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#351-353">source</a><h4 class="code-header">pub fn <a href="#method.name" class="fn">name</a>(&amp;self) -&gt; &amp;'static <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a></h4></section></summary><div class="docblock"><p>Returns the spans name,</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.fields" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#358-360">source</a><h4 class="code-header">pub fn <a href="#method.fields" class="fn">fields</a>(&amp;self) -&gt; &amp;<a class="struct" href="../../tracing_core/field/struct.FieldSet.html" title="struct tracing_core::field::FieldSet">FieldSet</a></h4></section></summary><div class="docblock"><p>Returns a list of <a href="../../tracing_core/field/index.html" title="mod tracing_core::field">fields</a> defined by the span.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.parent" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#364-394">source</a><h4 class="code-header">pub fn <a href="#method.parent" class="fn">parent</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;Self&gt;</h4></section></summary><div class="docblock"><p>Returns a <code>SpanRef</code> describing this spans parent, or <code>None</code> if this
span is the root of its trace tree.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.scope" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#463-471">source</a><h4 class="code-header">pub fn <a href="#method.scope" class="fn">scope</a>(&amp;self) -&gt; <a class="struct" href="struct.Scope.html" title="struct tracing_subscriber::registry::Scope">Scope</a>&lt;'a, R&gt; <a href="#" class="tooltip" data-notable-ty="Scope&lt;&#39;a, R&gt;"></a></h4></section></summary><div class="docblock"><p>Returns an iterator over all parents of this span, starting with this span,
ordered from leaf to root.</p>
<p>The iterator will first return the span, then the spans immediate parent,
followed by that spans parent, and so on, until it reaches a root span.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::{span, Subscriber};
<span class="kw">use </span>tracing_subscriber::{
layer::{Context, Layer},
prelude::<span class="kw-2">*</span>,
registry::LookupSpan,
};
<span class="kw">struct </span>PrintingLayer;
<span class="kw">impl</span>&lt;S&gt; Layer&lt;S&gt; <span class="kw">for </span>PrintingLayer
<span class="kw">where
</span>S: Subscriber + <span class="kw">for</span>&lt;<span class="lifetime">'lookup</span>&gt; LookupSpan&lt;<span class="lifetime">'lookup</span>&gt;,
{
<span class="kw">fn </span>on_enter(<span class="kw-2">&amp;</span><span class="self">self</span>, id: <span class="kw-2">&amp;</span>span::Id, ctx: Context&lt;S&gt;) {
<span class="kw">let </span>span = ctx.span(id).unwrap();
<span class="kw">let </span>scope = span.scope().map(|span| span.name()).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
<span class="macro">println!</span>(<span class="string">"Entering span: {:?}"</span>, scope);
}
}
tracing::subscriber::with_default(tracing_subscriber::registry().with(PrintingLayer), || {
<span class="kw">let </span>_root = <span class="macro">tracing::info_span!</span>(<span class="string">"root"</span>).entered();
<span class="comment">// Prints: Entering span: ["root"]
</span><span class="kw">let </span>_child = <span class="macro">tracing::info_span!</span>(<span class="string">"child"</span>).entered();
<span class="comment">// Prints: Entering span: ["child", "root"]
</span><span class="kw">let </span>_leaf = <span class="macro">tracing::info_span!</span>(<span class="string">"leaf"</span>).entered();
<span class="comment">// Prints: Entering span: ["leaf", "child", "root"]
</span>});</code></pre></div>
<p>If the opposite order (from the root to this span) is desired, calling <a href="struct.Scope.html#method.from_root" title="method tracing_subscriber::registry::Scope::from_root"><code>Scope::from_root</code></a> on
the returned iterator reverses the order.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">impl</span>&lt;S&gt; Layer&lt;S&gt; <span class="kw">for </span>PrintingLayer
<span class="kw">where
</span>S: Subscriber + <span class="kw">for</span>&lt;<span class="lifetime">'lookup</span>&gt; LookupSpan&lt;<span class="lifetime">'lookup</span>&gt;,
{
<span class="kw">fn </span>on_enter(<span class="kw-2">&amp;</span><span class="self">self</span>, id: <span class="kw-2">&amp;</span>span::Id, ctx: Context&lt;S&gt;) {
<span class="kw">let </span>span = ctx.span(id).unwrap();
<span class="kw">let </span>scope = span.scope().from_root().map(|span| span.name()).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
<span class="macro">println!</span>(<span class="string">"Entering span: {:?}"</span>, scope);
}
}
tracing::subscriber::with_default(tracing_subscriber::registry().with(PrintingLayer), || {
<span class="kw">let </span>_root = <span class="macro">tracing::info_span!</span>(<span class="string">"root"</span>).entered();
<span class="comment">// Prints: Entering span: ["root"]
</span><span class="kw">let </span>_child = <span class="macro">tracing::info_span!</span>(<span class="string">"child"</span>).entered();
<span class="comment">// Prints: Entering span: ["root", "child"]
</span><span class="kw">let </span>_leaf = <span class="macro">tracing::info_span!</span>(<span class="string">"leaf"</span>).entered();
<span class="comment">// Prints: Entering span: ["root", "child", "leaf"]
</span>});</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.extensions" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#479-481">source</a><h4 class="code-header">pub fn <a href="#method.extensions" class="fn">extensions</a>(&amp;self) -&gt; <a class="struct" href="struct.Extensions.html" title="struct tracing_subscriber::registry::Extensions">Extensions</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Returns a reference to this spans <code>Extensions</code>.</p>
<p>The extensions may be used by <code>Layer</code>s to store additional data
describing the span.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.extensions_mut" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#489-491">source</a><h4 class="code-header">pub fn <a href="#method.extensions_mut" class="fn">extensions_mut</a>(&amp;self) -&gt; <a class="struct" href="struct.ExtensionsMut.html" title="struct tracing_subscriber::registry::ExtensionsMut">ExtensionsMut</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Returns a mutable reference to this spans <code>Extensions</code>.</p>
<p>The extensions may be used by <code>Layer</code>s to store additional data
describing the span.</p>
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-SpanRef%3C'a,+R%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#207">source</a><a href="#impl-Debug-for-SpanRef%3C'a,+R%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, R: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, R&gt;<div class="where">where
R::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#207">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.76.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></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-RefUnwindSafe-for-SpanRef%3C'a,+R%3E" class="impl"><a href="#impl-RefUnwindSafe-for-SpanRef%3C'a,+R%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, R&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, R&gt;<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
&lt;R as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-SpanRef%3C'a,+R%3E" class="impl"><a href="#impl-Send-for-SpanRef%3C'a,+R%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, R&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, R&gt;<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
&lt;R as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h3></section><section id="impl-Sync-for-SpanRef%3C'a,+R%3E" class="impl"><a href="#impl-Sync-for-SpanRef%3C'a,+R%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, R&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, R&gt;<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
&lt;R as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,</div></h3></section><section id="impl-Unpin-for-SpanRef%3C'a,+R%3E" class="impl"><a href="#impl-Unpin-for-SpanRef%3C'a,+R%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, R&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, R&gt;<div class="where">where
&lt;R as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-SpanRef%3C'a,+R%3E" class="impl"><a href="#impl-UnwindSafe-for-SpanRef%3C'a,+R%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, R&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, R&gt;<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
&lt;R as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,</div></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/1.76.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/any.rs.html#141">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/borrow.rs.html#210">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/borrow.rs.html#217">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#763">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; 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/1.76.0/src/core/convert/mod.rs.html#766">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Instrument-for-T" class="impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#325">source</a><a href="#impl-Instrument-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="../../tracing/instrument/trait.Instrument.html" title="trait tracing::instrument::Instrument">Instrument</a> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.instrument" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#86">source</a><a href="#method.instrument" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.Instrument.html#method.instrument" class="fn">instrument</a>(self, span: <a class="struct" href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span">Span</a>) -&gt; <a class="struct" href="../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Instruments this type with the provided <a href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <a href="../../tracing/instrument/trait.Instrument.html#method.instrument">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.in_current_span" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#128">source</a><a href="#method.in_current_span" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.Instrument.html#method.in_current_span" class="fn">in_current_span</a>(self) -&gt; <a class="struct" href="../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Instruments this type with the <a href="../../tracing/span/struct.Span.html#method.current" title="associated function tracing::span::Span::current">current</a> <a href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <a href="../../tracing/instrument/trait.Instrument.html#method.in_current_span">Read more</a></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/1.76.0/src/core/convert/mod.rs.html#747-749">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</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/1.76.0/src/core/convert/mod.rs.html#756">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; 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/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</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/1.76.0/src/core/convert/mod.rs.html#803-805">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#810">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</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/1.76.0/src/core/convert/mod.rs.html#788-790">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#795">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-WithSubscriber-for-T" class="impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#393">source</a><a href="#impl-WithSubscriber-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="../../tracing/instrument/trait.WithSubscriber.html" title="trait tracing::instrument::WithSubscriber">WithSubscriber</a> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_subscriber" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#176-178">source</a><a href="#method.with_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber" class="fn">with_subscriber</a>&lt;S&gt;(self, subscriber: S) -&gt; <a class="struct" href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a>&lt;Self&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>&gt;,</div></h4></section></summary><div class='docblock'>Attaches the provided <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
<a href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.with_current_subscriber" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#228">source</a><a href="#method.with_current_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber" class="fn">with_current_subscriber</a>(self) -&gt; <a class="struct" href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Attaches the current <a href="../../tracing/dispatcher/index.html#setting-the-default-subscriber" title="mod tracing::dispatcher">default</a> <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
<a href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber">Read more</a></div></details></div></details></div><script type="text/json" id="notable-traits-data">{"Scope<'a, R>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Scope.html\" title=\"struct tracing_subscriber::registry::Scope\">Scope</a>&lt;'a, R&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, R&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.Scope.html\" title=\"struct tracing_subscriber::registry::Scope\">Scope</a>&lt;'a, R&gt;<div class=\"where\">where\n R: <a class=\"trait\" href=\"trait.LookupSpan.html\" title=\"trait tracing_subscriber::registry::LookupSpan\">LookupSpan</a>&lt;'a&gt;,</div></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"struct\" href=\"struct.SpanRef.html\" title=\"struct tracing_subscriber::registry::SpanRef\">SpanRef</a>&lt;'a, R&gt;;</div>"}</script></section></div></main></body></html>