<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="Metadata describing a span or event."><title>Metadata in tracing - Rust</title><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><linkrel="stylesheet"href="../static.files/normalize-76eba96aa4d2e634.css"><linkrel="stylesheet"href="../static.files/rustdoc-5bc39a1768837dd0.css"><metaname="rustdoc-vars"data-root-path="../"data-static-root-path="../static.files/"data-current-crate="tracing"data-themes=""data-resource-suffix=""data-rustdoc-version="1.77.2 (25ef9e3d8 2024-04-09)"data-channel="1.77.2"data-search-js="search-dd67cee4cfa65049.js"data-settings-js="settings-4313503d2e1961c2.js"><scriptsrc="../static.files/storage-4c98445ec4002617.js"></script><scriptdefersrc="sidebar-items.js"></script><scriptdefersrc="../static.files/main-48f368f3872407c8.js"></script><noscript><linkrel="stylesheet"href="../static.files/noscript-04d5337699b92874.css"></noscript><linkrel="alternate icon"type="image/png"href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><linkrel="alternate icon"type="image/png"href="../static.files/favicon-32x32-422f7d1d52889060.png"><linkrel="icon"type="image/svg+xml"href="../static.files/favicon-2c020d218678b618.svg"></head><bodyclass="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="mobile-topbar"><buttonclass="sidebar-menu-toggle"title="show sidebar"></button><aclass="logo-container"href="../tracing/index.html"><imgsrc="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png"alt=""></a></nav><navclass="sidebar"><divclass="sidebar-crate"><aclass="logo-container"href="../tracing/index.html"><imgsrc="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png"alt="logo"></a><h2><ahref="../tracing/index.html">tracing</a><spanclass="version">0.1.40</span></h2></div><h2class="location"><ahref="#">Metadata</a></h2><divclass="sidebar-elems"><section><h3><ahref="#implementations">Methods</a></h3><ulclass="block method"><li><ahref="#method.callsite">callsite</a></li><li><ahref="#method.fields">fields</a></li><li><ahref="#method.file">file</a></li><li><ahref="#method.is_event">is_event</a></li><li><ahref="#method.is_span">is_span</a></li><li><ahref="#method.level">level</a></li><li><ahref="#method.line">line</a></li><li><ahref="#method.module_path">module_path</a></li><li><ahref="#method.name">name</a></li><li><ahref="#method.new">new</a></li><li><ahref="#method.target">target</a></li></ul><h3><ahref="#trait-implementations">Trait Implementations</a></h3><ulclass="block trait-implementation"><li><ahref="#impl-Debug-for-Metadata%3C'a%3E">Debug</a></li><li><ahref="#impl-Eq-for-Metadata%3C'a%3E">Eq</a></li><li><ahref="#impl-PartialEq-for-Metadata%3C'a%3E">PartialEq</a></li></ul><h3><ahref="#synthetic-implementations">Auto Trait Implementations</a></h3><ulclass="block synthetic-implementation"><li><ahref="#impl-RefUnwindSafe-for-Metadata%3C'a%3E">!RefUnwindSafe</a></li><li><ahref="#impl-UnwindSafe-for-Metadata%3C'a%3E">!UnwindSafe</a></li><li><ahref="#impl-Send-for-Metadata%3C'a%3E">Send</a></li><li><ahref="#impl-Sync-for-Metadata%3C'a%3E">Sync</a></li><li><ahref="#impl-Unpin-for-Metadata%3C'a%3E">Unpin</a></li></ul><
<main><divclass="width-limiter"><navclass="sub"><formclass="search-form"><span></span><divid="sidebar-button"tabindex="-1"><ahref="../tracing/all.html"title="show sidebar"></a></div><inputclass="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"><divid="help-button"tabindex="-1"><ahref="../help.html"title="help">?</a></div><divid="settings-menu"tabindex="-1"><ahref="../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><sectionid="main-content"class="content"><divclass="main-heading"><h1>Struct <ahref="index.html">tracing</a>::<wbr><aclass="struct"href="#">Metadata</a><buttonid="copy-path"title="Copy item path to clipboard"><imgsrc="../static.files/clipboard-7571035ce49a181d.svg"width="19"height="18"alt="Copy item path"></button></h1><spanclass="out-of-band"><aclass="src"href="../src/tracing_core/metadata.rs.html#57">source</a> · <buttonid="toggle-all-docs"title="collapse all docs">[<span>−</span>]</button></span></div><preclass="rust item-decl"><code>pub struct Metadata<'a> { <spanclass="comment">/* private fields */</span> }</code></pre><detailsclass="toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>Metadata describing a <ahref="../tracing_core/span/index.html"title="mod tracing_core::span">span</a> or <ahref="event/index.html"title="mod tracing::event">event</a>.</p>
<p>All spans and events have the following metadata:</p>
<ul>
<li>A <ahref="struct.Metadata.html#method.name"title="method tracing::Metadata::name">name</a>, represented as a static string.</li>
<li>A <ahref="struct.Metadata.html#method.target"title="method tracing::Metadata::target">target</a>, a string that categorizes part of the system where the span
or event occurred. The <code>tracing</code> macros default to using the module
path where the span or event originated as the target, but it may be
overridden.</li>
<li>A <ahref="struct.Metadata.html#method.level"title="method tracing::Metadata::level">verbosity level</a>. This determines how verbose a given span or event
is, and allows enabling or disabling more verbose diagnostics
situationally. See the documentation for the <ahref="struct.Level.html"title="struct tracing::Level"><code>Level</code></a> type for details.</li>
<li>The names of the <ahref="struct.Metadata.html#method.fields"title="method tracing::Metadata::fields">fields</a> defined by the span or event.</li>
<li>Whether the metadata corresponds to a span or event.</li>
</ul>
<p>In addition, the following optional metadata describing the source code
location where the span or event originated <em>may</em> be provided:</p>
<p>Metadata is used by <ahref="trait.Subscriber.html"title="trait tracing::Subscriber"><code>Subscriber</code></a>s when filtering spans and events, and it
may also be used as part of their data payload.</p>
<p>When created by the <code>event!</code> or <code>span!</code> macro, the metadata describing a
particular event or span is constructed statically and exists as a single
static instance. Thus, the overhead of creating the metadata is
<em>significantly</em> lower than that of creating the actual span. Therefore,
filtering is based on metadata, rather than on the constructed span.</p>
<p>In well-behaved applications, two <code>Metadata</code> with equal
<ahref="struct.Metadata.html#method.callsite"title="method tracing::Metadata::callsite">callsite identifiers</a> will be equal in all other ways (i.e., have the same
<code>name</code>, <code>target</code>, etc.). Consequently, in release builds, <ahref="struct.Metadata.html#method.eq"title="method tracing::Metadata::eq"><code>Metadata::eq</code></a>
<em>only</em> checks that its arguments have equal callsites. However, the equality
of <code>Metadata</code>’s other fields is checked in debug builds.</p>
) -><aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h4></section></summary><divclass="docblock"><p>Construct new metadata for a span or event, with a name, target, level, field
names, and optional source code location.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.fields"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#277">source</a><h4class="code-header">pub fn <ahref="#method.fields"class="fn">fields</a>(&self) ->&<aclass="struct"href="field/struct.FieldSet.html"title="struct tracing::field::FieldSet">FieldSet</a></h4></section></summary><divclass="docblock"><p>Returns the names of the fields on the described span or event.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.level"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#282">source</a><h4class="code-header">pub fn <ahref="#method.level"class="fn">level</a>(&self) ->&<aclass="struct"href="struct.Level.html"title="struct tracing::Level">Level</a></h4></section></summary><divclass="docblock"><p>Returns the level of verbosity of the described span or event.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.name"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#287">source</a><h4class="code-header">pub fn <ahref="#method.name"class="fn">name</a>(&self) ->&'static <aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.str.html">str</a></h4></section></summary><divclass="docblock"><p>Returns the name of the span.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.target"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#296">source</a><h4class="code-header">pub fn <ahref="#method.target"class="fn">target</a>(&self) ->&'a <aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.str.html">str</a></h4></section></summary><divclass="docblock"><p>Returns a string describing the part of the system where the span or
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.module_path"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#302">source</a><h4class="code-header">pub fn <ahref="#method.module_path"class="fn">module_path</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.77.2/core/option/enum.Option.html"title="enum core::option::Option">Option</a><&'a <aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.str.html">str</a>></h4></section></summary><divclass="docblock"><p>Returns the path to the Rust module where the span occurred, or
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.file"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#308">source</a><h4class="code-header">pub fn <ahref="#method.file"class="fn">file</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.77.2/core/option/enum.Option.html"title="enum core::option::Option">Option</a><&'a <aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.str.html">str</a>></h4></section></summary><divclass="docblock"><p>Returns the name of the source code file where the span
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.line"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#314">source</a><h4class="code-header">pub fn <ahref="#method.line"class="fn">line</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.77.2/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.u32.html">u32</a>></h4></section></summary><divclass="docblock"><p>Returns the line number in the source code file where the span
occurred, or <code>None</code> if the line number is unknown.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.callsite"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#321">source</a><h4class="code-header">pub fn <ahref="#method.callsite"class="fn">callsite</a>(&self) -><aclass="struct"href="../tracing_core/callsite/struct.Identifier.html"title="struct tracing_core::callsite::Identifier">Identifier</a></h4></section></summary><divclass="docblock"><p>Returns an opaque <code>Identifier</code> that uniquely identifies the callsite
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.is_event"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#326">source</a><h4class="code-header">pub fn <ahref="#method.is_event"class="fn">is_event</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.bool.html">bool</a></h4></section></summary><divclass="docblock"><p>Returns true if the callsite kind is <code>Event</code>.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.is_span"class="method"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#331">source</a><h4class="code-header">pub fn <ahref="#method.is_span"class="fn">is_span</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.bool.html">bool</a></h4></section></summary><divclass="docblock"><p>Return true if the callsite kind is <code>Span</code>.</p>
</div></details></div></details></div><h2id="trait-implementations"class="section-header">Trait Implementations<ahref="#trait-implementations"class="anchor">§</a></h2><divid="trait-implementations-list"><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Debug-for-Metadata%3C'a%3E"class="impl"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#336">source</a><ahref="#impl-Debug-for-Metadata%3C'a%3E"class="anchor">§</a><h3class="code-header">impl<'a><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a> for <aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.fmt"class="method trait-impl"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#337">source</a><ahref="#method.fmt"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/fmt/trait.Debug.html#tymethod.fmt"class="fn">fmt</a>(&self, f: &mut <aclass="struct"href="https://doc.rust-lang.org/1.77.2/core/fmt/struct.Formatter.html"title="struct core::fmt::Formatter">Formatter</a><'_>) -><aclass="enum"href="https://doc.rust-lang.org/1.77.2/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.unit.html">()</a>, <aclass="struct"href="https://doc.rust-lang.org/1.77.2/core/fmt/struct.Error.html"title="struct core::fmt::Error">Error</a>></h4></section></summary><divclass='docblock'>Formats the value using the given formatter. <ahref="https://doc.rust-lang.org/1.77.2/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-PartialEq-for-Metadata%3C'a%3E"class="impl"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#446">source</a><ahref="#impl-PartialEq-for-Metadata%3C'a%3E"class="anchor">§</a><h3class="code-header">impl<'a><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/cmp/trait.PartialEq.html"title="trait core::cmp::PartialEq">PartialEq</a> for <aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.eq"class="method trait-impl"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#448">source</a><ahref="#method.eq"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/cmp/trait.PartialEq.html#tymethod.eq"class="fn">eq</a>(&self, other: &<aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used
by <code>==</code>.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.ne"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.0.0">1.0.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.77.2/src/core/cmp.rs.html#242">source</a></span><ahref="#method.ne"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/cmp/trait.PartialEq.html#method.ne"class="fn">ne</a>(&self, other: <aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.reference.html">&Rhs</a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>This method tests for <code>!=</code>. The default implementation is almost always
sufficient, and should not be overridden without very good reason.</div></details></div></details><sectionid="impl-Eq-for-Metadata%3C'a%3E"class="impl"><aclass="src rightside"href="../src/tracing_core/metadata.rs.html#444">source</a><ahref="#impl-Eq-for-Metadata%3C'a%3E"class="anchor">§</a><h3class="code-header">impl<'a><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/cmp/trait.Eq.html"title="trait core::cmp::Eq">Eq</a> for <aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h3></section></div><h2id="synthetic-implementations"class="section-header">Auto Trait Implementations<ahref="#synthetic-implementations"class="anchor">§</a></h2><divid="synthetic-implementations-list"><sectionid="impl-RefUnwindSafe-for-Metadata%3C'a%3E"class="impl"><ahref="#impl-RefUnwindSafe-for-Metadata%3C'a%3E"class="anchor">§</a><h3class="code-header">impl<'a> !<aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/panic/unwind_safe/trait.RefUnwindSafe.html"title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h3></section><sectionid="impl-Send-for-Metadata%3C'a%3E"class="impl"><ahref="#impl-Send-for-Metadata%3C'a%3E"class="anchor">§</a><h3class="code-header">impl<'a><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a> for <aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h3></section><sectionid="impl-Sync-for-Metadata%3C'a%3E"class="impl"><ahref="#impl-Sync-for-Metadata%3C'a%3E"class="anchor">§</a><h3class="code-header">impl<'a><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a> for <aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h3></section><sectionid="impl-Unpin-for-Metadata%3C'a%3E"class="impl"><ahref="#impl-Unpin-for-Metadata%3C'a%3E"class="anchor">§</a><h3class="code-header">impl<'a><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/marker/trait.Unpin.html"title="trait core::marker::Unpin">Unpin</a> for <aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h3></section><sectionid="impl-UnwindSafe-for-Metadata%3C'a%3E"class="impl"><ahref="#impl-UnwindSafe-for-Metadata%3C'a%3E"class="anchor">§</a><h3class="code-header">impl<'a> !<aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/panic/unwind_safe/trait.UnwindSafe.html"title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <aclass="struct"href="struct.Metadata.html"title="struct tracing::Metadata">Metadata</a><'a></h3></section></div><h2id="blanket-implementations"class="section-header">Blanket Implementations<ahref="#blanket-implementations"class="anchor">§</a></h2><divid="blanket-implementations-list"><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-Any-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/any.rs.html#140">source</a><ahref="#impl-Any-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/any/trait.Any.html"title="trait core::any::Any">Any</a> for T<divclass="where">where
T: 'static + ?<aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.type_id"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/any.rs.html#141">source</a><ahref="#method.type_id"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/any/trait.Any.html#tymethod.type_id"class="fn">type_id</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/1.77.2/core/any/struct.TypeId.html"title="struct core::any::TypeId">TypeId</a></h4></section></summary><divclass='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <ahref="https://doc.rust-lang.org/1.77.2/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-Borrow%3CT%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/borrow.rs.html#208">source</a><ahref="#impl-Borrow%3CT%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/borrow/trait.Borrow.html"title="trait core::borrow::Borrow">Borrow</a><T> for T<divclass="where">where
T: ?<aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.borrow"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/borrow.rs.html#210">source</a><ahref="#method.borrow"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/borrow/trait.Borrow.html#tymethod.borrow"class="fn">borrow</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.reference.html">&T</a></h4></section></summary><divclass='docblock'>Immutably borrows from an owned value. <ahref="https://doc.rust-lang.org/1.77.2/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-BorrowMut%3CT%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/borrow.rs.html#216">source</a><ahref="#impl-BorrowMut%3CT%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/borrow/trait.BorrowMut.html"title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<divclass="where">where
T: ?<aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.borrow_mut"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/borrow.rs.html#217">source</a><ahref="#method.borrow_mut"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut"class="fn">borrow_mut</a>(&mut self) -><aclass="primitive"href="https://doc.rust-lang.org/1.77.2/std/primitive.reference.html">&mut T</a></h4></section></summary><divclass='docblock'>Mutably borrows from an owned value. <ahref="https://doc.rust-lang.org/1.77.2/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-From%3CT%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/convert/mod.rs.html#764">source</a><ahref="#impl-From%3CT%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.From.html"title="trait core::convert::From">From</a><T> for T</h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.from"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/convert/mod.rs.html#767">source</a><ahref="#method.from"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/convert/trait.From.html#tymethod.from"class="fn">from</a>(t: T) -> T</h4></section></summary><divclass="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-Instrument-for-T"class="impl"><aclass="src rightside"href="../src/tracing/instrument.rs.html#325">source</a><ahref="#impl-Instrument-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="trait.Instrument.html"title="trait tracing::Instrument">Instrument</a> for T</h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.instrument"class="method trait-impl"><aclass="src rightside"href="../src/tracing/instrument.rs.html#86-91">source</a><ahref="#method.instrument"class="anchor">§</a><h4class="code-header">fn <ahref="trait.Instrument.html#method.instrument"class="fn">instrument</a>(self, span: <aclass="struct"href="struct.Span.html"title="struct tracing::Span">Span</a>) -><aclass="struct"href="instrument/struct.Instrumented.html"title="struct tracing::instrument::Instrumented">Instrumented</a><Self><ahref="#"class="tooltip"data-notable-ty="Instrumented<Self>">ⓘ</a></h4></section></summary><divclass='docblock'>Instruments this type with the provided <ahref="struct.Span.html"title="struct tracing::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <ahref="trait.Instrument.html#method.instrument">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.in_current_span"class="method trait-impl"><aclass="src rightside"href="../src/tracing/instrument.rs.html#128-130">source</a><ahref="#method.in_current_span"class="anchor">§</a><h4class="code-header">fn <ahref="trait.Instrument.html#method.in_current_span"class="fn">in_current_span</a>(self) -><aclass="struct"href="instrument/struct.Instrumented.html"title="struct tracing::instrument::Instrumented">Instrumented</a><Self><ahref="#"class="tooltip"data-notable-ty="Instrumented<Self>">ⓘ</a></h4></section></summary><divclass='docblock'>Instruments this type with the <ahref="struct.Span.html#method.current"title="associated function tracing::Span::current">current</a><ahref="struct.Span.html"title="struct tracing::Span"><code>Span</code></a>, returning an
<code><ahref="https://doc.rust-lang.org/1.77.2/core/convert/trait.From.html"title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-TryFrom%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/convert/mod.rs.html#804-806">source</a><ahref="#impl-TryFrom%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T<divclass="where">where
U: <aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Error-1"class="associatedtype trait-impl"><ahref="#associatedtype.Error-1"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html#associatedtype.Error"class="associatedtype">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/1.77.2/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></h4></section></summary><divclass='docblock'>The type returned in the event of a conversion error.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_from"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/convert/mod.rs.html#811">source</a><ahref="#method.try_from"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html#tymethod.try_from"class="fn">try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/1.77.2/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><divclass='docblock'>Performs the conversion.</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-TryInto%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/convert/mod.rs.html#789-791">source</a><ahref="#impl-TryInto%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T<divclass="where">where
U: <aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Error"class="associatedtype trait-impl"><ahref="#associatedtype.Error"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryInto.html#associatedtype.Error"class="associatedtype">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><divclass='docblock'>The type returned in the event of a conversion error.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_into"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.77.2/src/core/convert/mod.rs.html#796">source</a><ahref="#method.try_into"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryInto.html#tymethod.try_into"class="fn">try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/1.77.2/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><divclass='docblock'>Performs the conversion.</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-WithSubscriber-for-T"class="impl"><aclass="src rightside"href="../src/tracing/instrument.rs.html#393">source</a><ahref="#impl-WithSubscriber-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="instrument/trait.WithSubscriber.html"title="trait tracing::instrument::WithSubscriber">WithSubscriber</a> for T</h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.with_subscriber"class="method trait-impl"><aclass="src rightside"href="../src/tracing/instrument.rs.html#176-184">source</a><ahref="#method.with_subscriber"class="anchor">§</a><h4class="code-header">fn <ahref="instrument/trait.WithSubscriber.html#method.with_subscriber"class="fn">with_subscriber</a><S>(self, subscriber: S) -><aclass="struct"href="instrument/struct.WithDispatch.html"title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self><ahref="#"class="tooltip"data-notable-ty="WithDispatch<Self>">ⓘ</a><divclass="where">where
S: <aclass="trait"href="https://doc.rust-lang.org/1.77.2/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="struct"href="struct.Dispatch.html"title="struct tracing::Dispatch">Dispatch</a>>,</div></h4></section></summary><divclass='docblock'>Attaches the provided <ahref="trait.Subscriber.html"title="trait tracing::Subscriber"><code>Subscriber</code></a> to this type, returning a
<ahref="instrument/struct.WithDispatch.html"title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <ahref="instrument/trait.WithSubscriber.html#method.with_subscriber">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.with_current_subscriber"class="method trait-impl"><aclass="src rightside"href="../src/tracing/instrument.rs.html#228-233">source</a><ahref="#method.with_current_subscriber"class="anchor">§</a><h4class="code-header">fn <ahref="instrument/trait.WithSubscriber.html#method.with_current_subscriber"class="fn">with_current_subscriber</a>(self) -><aclass="struct"href="instrument/struct.WithDispatch.html"title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self><ahref="#"class="tooltip"data-notable-ty="WithDispatch<Self>">ⓘ</a></h4></section></summary><divclass='docblock'>Attaches the current <ahref="dispatcher/index.html#setting-the-default-subscriber"title="mod tracing::dispatcher">default</a><ahref="trait.Subscriber.html"title="trait tracing::Subscriber"><code>Subscriber</code></a> to this type, returning a
