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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 `Subscriber` that logs formatted representations of `tracing` events."><title>Subscriber in tracing_subscriber::fmt - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-dd39b87e5fcfba68.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="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><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="#">Subscriber</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Associated Constants</a></h3><ul class="block associatedconstant"><li><a href="#associatedconstant.DEFAULT_MAX_LEVEL">DEFAULT_MAX_LEVEL</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.builder">builder</a></li><li><a href="#method.new">new</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-Subscriber%3CN,+E,+F,+W%3E">Debug</a></li><li><a href="#impl-Default-for-Subscriber">Default</a></li><li><a href="#impl-LookupSpan%3C'a%3E-for-Subscriber%3CN,+E,+F,+W%3E">LookupSpan&lt;&#x27;a&gt;</a></li><li><a href="#impl-Subscriber-for-Subscriber%3CN,+E,+F,+W%3E">Subscriber</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-Subscriber%3CN,+E,+F,+W%3E">!Freeze</a></li><li><a href="#impl-UnwindSafe-for-Subscriber%3CN,+E,+F,+W%3E">!UnwindSafe</a></li><li><a href="#impl-RefUnwindSafe-for-Subscriber%3CN,+E,+F,+W%3E">RefUnwindSafe</a></li><li><a href="#impl-Send-for-Subscriber%3CN,+E,+F,+W%3E">Send</a></li><li><a href="#impl-Sync-for-Subscriber%3CN,+E,+F,+W%3E">Sync</a></li><li><a href="#impl-Unpin-for-Subscriber%3CN,+E,+F,+W%3E">Unpin</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-SubscriberExt-for-S">SubscriberExt</a></li><li><a href="#impl-SubscriberInitExt-for-T">SubscriberInitExt</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::fmt</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../index.html">tracing_subscriber</a>::<wbr><a href="index.html">fmt</a>::<wbr><a class="struct" href="#">Subscriber</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/tracing_subscriber/fmt/mod.rs.html#225-232">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 Subscriber&lt;N = <a class="struct" href="format/struct.DefaultFields.html" title="struct tracing_subscriber::fmt::format::DefaultFields">DefaultFields</a>, E = <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a>&lt;<a class="struct" href="format/struct.Full.html" title="struct tracing_subscriber::fmt::format::Full">Full</a>&gt;, F = <a class="struct" href="../filter/struct.LevelFilter.html" title="struct tracing_subscriber::filter::LevelFilter">LevelFilter</a>, W = <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.fn.html">fn</a>() -&gt; <a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/stdio/struct.Stdout.html" title="struct std::io::stdio::Stdout">Stdout</a>&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 <code>Subscriber</code> that logs formatted representations of <code>tracing</code> events.</p>
<p>This consists of an inner <code>Formatter</code> wrapped in a layer that performs filtering.</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-Subscriber" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#338-357">source</a><a href="#impl-Subscriber" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedconstant.DEFAULT_MAX_LEVEL" class="associatedconstant"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#346">source</a><h4 class="code-header">pub const <a href="#associatedconstant.DEFAULT_MAX_LEVEL" class="constant">DEFAULT_MAX_LEVEL</a>: <a class="struct" href="../filter/struct.LevelFilter.html" title="struct tracing_subscriber::filter::LevelFilter">LevelFilter</a> = LevelFilter::INFO</h4></section></summary><div class="docblock"><p>The maximum <a href="../../tracing_core/metadata/struct.Level.html" title="struct tracing_core::metadata::Level">verbosity level</a> that is enabled by a <code>Subscriber</code> by
default.</p>
<p>This can be overridden with the <a href="struct.SubscriberBuilder.html#method.with_max_level" title="method tracing_subscriber::fmt::SubscriberBuilder::with_max_level"><code>SubscriberBuilder::with_max_level</code></a> method.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.builder" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#349-351">source</a><h4 class="code-header">pub fn <a href="#method.builder" class="fn">builder</a>() -&gt; <a class="struct" href="struct.SubscriberBuilder.html" title="struct tracing_subscriber::fmt::SubscriberBuilder">SubscriberBuilder</a></h4></section></summary><div class="docblock"><p>Returns a new <code>SubscriberBuilder</code> for configuring a format subscriber.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#354-356">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>() -&gt; Self</h4></section></summary><div class="docblock"><p>Returns a new format subscriber with the default configuration.</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-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#224">source</a><a href="#impl-Debug-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;N: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, E: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, W: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;</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/fmt/mod.rs.html#224">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-Subscriber" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#359-363">source</a><a href="#impl-Default-for-Subscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#360-362">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -&gt; Self</h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-LookupSpan%3C'a%3E-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#451-460">source</a><a href="#impl-LookupSpan%3C'a%3E-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, N, E, F, W&gt; <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt; for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;<div class="where">where
<a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;F, <a class="type" href="type.Formatter.html" title="type tracing_subscriber::fmt::Formatter">Formatter</a>&lt;N, E, W&gt;&gt;: <a class="trait" href="../registry/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" open><summary><section id="associatedtype.Data" class="associatedtype trait-impl"><a href="#associatedtype.Data" class="anchor">§</a><h4 class="code-header">type <a href="../registry/trait.LookupSpan.html#associatedtype.Data" class="associatedtype">Data</a> = &lt;<a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;F, <a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;<a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a>&lt;<a class="struct" href="../registry/struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>, N, E, W&gt;, <a class="struct" href="../registry/struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>&gt;&gt; as <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="../registry/trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a></h4></section></summary><div class='docblock'>The type of span data stored in this registry.</div></details><details class="toggle method-toggle" open><summary><section id="method.span_data" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#457-459">source</a><a href="#method.span_data" class="anchor">§</a><h4 class="code-header">fn <a href="../registry/trait.LookupSpan.html#tymethod.span_data" class="fn">span_data</a>(&amp;'a self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;Self::<a class="associatedtype" href="../registry/trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>&gt;</h4></section></summary><div class='docblock'>Returns the <a href="../registry/trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData"><code>SpanData</code></a> for a given <code>Id</code>, if it exists.</div></details><details class="toggle method-toggle" open><summary><section id="method.span" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#118-129">source</a><a href="#method.span" class="anchor">§</a><h4 class="code-header">fn <a href="../registry/trait.LookupSpan.html#method.span" class="fn">span</a>(&amp;'a self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'_, Self&gt;&gt;<div class="where">where
Self: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Returns a <a href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef"><code>SpanRef</code></a> for the span with the given <code>Id</code>, if it exists. <a href="../registry/trait.LookupSpan.html#method.span">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.register_filter" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#148-153">source</a><a href="#method.register_filter" class="anchor">§</a><h4 class="code-header">fn <a href="../registry/trait.LookupSpan.html#method.register_filter" class="fn">register_filter</a>(&amp;mut self) -&gt; <a class="struct" href="../filter/struct.FilterId.html" title="struct tracing_subscriber::filter::FilterId">FilterId</a></h4></section></summary><div class='docblock'>Registers a <a href="../layer/trait.Filter.html" title="trait tracing_subscriber::layer::Filter"><code>Filter</code></a> for <a href="../layer/trait.Layer.html#per-layer-filtering" title="trait tracing_subscriber::layer::Layer">per-layer filtering</a> with this
<a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a>. <a href="../registry/trait.LookupSpan.html#method.register_filter">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Subscriber-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#367-449">source</a><a href="#impl-Subscriber-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;N, E, F, W&gt; <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;<div class="where">where
N: for&lt;'writer&gt; <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a>&lt;'writer&gt; + 'static,
E: <a class="trait" href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::FormatEvent">FormatEvent</a>&lt;<a class="struct" href="../registry/struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>, N&gt; + 'static,
F: <a class="trait" href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer">Layer</a>&lt;<a class="type" href="type.Formatter.html" title="type tracing_subscriber::fmt::Formatter">Formatter</a>&lt;N, E, W&gt;&gt; + 'static,
W: for&lt;'writer&gt; <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a>&lt;'writer&gt; + 'static,
<a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;F, <a class="type" href="type.Formatter.html" title="type tracing_subscriber::fmt::Formatter">Formatter</a>&lt;N, E, W&gt;&gt;: <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a>,
<a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a>&lt;<a class="struct" href="../registry/struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>, N, E, W&gt;: <a class="trait" href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer">Layer</a>&lt;<a class="struct" href="../registry/struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.register_callsite" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#377-379">source</a><a href="#method.register_callsite" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.register_callsite" class="fn">register_callsite</a>(&amp;self, meta: &amp;'static <a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'static&gt;) -&gt; <a class="struct" href="../../tracing_core/subscriber/struct.Interest.html" title="struct tracing_core::subscriber::Interest">Interest</a></h4></section></summary><div class='docblock'>Registers a new <a href="../../tracing_core/callsite/index.html" title="mod tracing_core::callsite">callsite</a> with this subscriber, returning whether or not
the subscriber is interested in being notified about the callsite. <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.register_callsite">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.enabled" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#382-384">source</a><a href="#method.enabled" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enabled" class="fn">enabled</a>(&amp;self, meta: &amp;<a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'_&gt;) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Returns true if a span or event with the specified <a href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">metadata</a> would be
recorded. <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enabled">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.new_span" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#387-389">source</a><a href="#method.new_span" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.new_span" class="fn">new_span</a>(&amp;self, attrs: &amp;<a class="struct" href="../../tracing_core/span/struct.Attributes.html" title="struct tracing_core::span::Attributes">Attributes</a>&lt;'_&gt;) -&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'>Visit the construction of a new span, returning a new <a href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">span ID</a> for the
span being constructed. <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.new_span">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.record" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#392-394">source</a><a href="#method.record" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record" class="fn">record</a>(&amp;self, span: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, values: &amp;<a class="struct" href="../../tracing_core/span/struct.Record.html" title="struct tracing_core::span::Record">Record</a>&lt;'_&gt;)</h4></section></summary><div class='docblock'>Record a set of values on a span. <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.record_follows_from" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#397-399">source</a><a href="#method.record_follows_from" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record_follows_from" class="fn">record_follows_from</a>(&amp;self, span: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, follows: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>)</h4></section></summary><div class='docblock'>Adds an indication that <code>span</code> follows from the span with the id
<code>follows</code>. <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record_follows_from">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.event_enabled" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#402-404">source</a><a href="#method.event_enabled" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.event_enabled" class="fn">event_enabled</a>(&amp;self, event: &amp;<a class="struct" href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event">Event</a>&lt;'_&gt;) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Determine if an <a href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event"><code>Event</code></a> should be recorded. <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.event_enabled">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.event" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#407-409">source</a><a href="#method.event" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.event" class="fn">event</a>(&amp;self, event: &amp;<a class="struct" href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event">Event</a>&lt;'_&gt;)</h4></section></summary><div class='docblock'>Records that an <a href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event"><code>Event</code></a> has occurred. <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.event">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.enter" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#412-415">source</a><a href="#method.enter" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enter" class="fn">enter</a>(&amp;self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>)</h4></section></summary><div class='docblock'>Records that a span has been entered. <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enter">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.exit" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#418-420">source</a><a href="#method.exit" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.exit" class="fn">exit</a>(&amp;self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>)</h4></section></summary><div class='docblock'>Records that a span has been exited. <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.exit">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.current_span" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#423-425">source</a><a href="#method.current_span" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.current_span" class="fn">current_span</a>(&amp;self) -&gt; <a class="struct" href="../../tracing_core/span/struct.Current.html" title="struct tracing_core::span::Current">Current</a></h4></section></summary><div class='docblock'>Returns a type representing this subscribers view of the current span. <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.current_span">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_span" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#428-430">source</a><a href="#method.clone_span" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.clone_span" class="fn">clone_span</a>(&amp;self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -&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'>Notifies the subscriber that a <a href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">span ID</a> has been cloned. <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.clone_span">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.try_close" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#433-435">source</a><a href="#method.try_close" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.try_close" class="fn">try_close</a>(&amp;self, id: <a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Notifies the subscriber that a <a href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">span ID</a> has been dropped, and returns
<code>true</code> if there are now 0 IDs that refer to that span. <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.try_close">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.max_level_hint" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#438-440">source</a><a href="#method.max_level_hint" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.max_level_hint" class="fn">max_level_hint</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../filter/struct.LevelFilter.html" title="struct tracing_subscriber::filter::LevelFilter">LevelFilter</a>&gt;</h4></section></summary><div class='docblock'>Returns the highest <a href="../../tracing_core/metadata/struct.Level.html" title="struct tracing_core::metadata::Level">verbosity level</a> that this <code>Subscriber</code> will
enable, or <code>None</code>, if the subscriber does not implement level-based
filtering or chooses not to implement this method. <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.max_level_hint">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.downcast_raw" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#442-448">source</a><a href="#method.downcast_raw" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.downcast_raw" class="fn">downcast_raw</a>(&amp;self, id: <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.pointer.html">*const </a><a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>&gt;</h4></section></summary><div class='docblock'>If <code>self</code> is the same type as the provided <code>TypeId</code>, returns an untyped
<code>*const</code> pointer to that type. Otherwise, returns <code>None</code>. <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.downcast_raw">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.on_register_dispatch" class="method trait-impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#103">source</a><a href="#method.on_register_dispatch" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.on_register_dispatch" class="fn">on_register_dispatch</a>(&amp;self, subscriber: &amp;<a class="struct" href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>)</h4></section></summary><div class='docblock'>Invoked when this subscriber becomes a <a href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch"><code>Dispatch</code></a>. <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.on_register_dispatch">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.drop_span" class="method trait-impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#407">source</a><a href="#method.drop_span" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.drop_span" class="fn">drop_span</a>(&amp;self, _id: <a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>)</h4></section></summary><span class="item-info"><div class="stab deprecated"><span class="emoji">👎</span><span>Deprecated since 0.1.2: use <code>Subscriber::try_close</code> instead</span></div></span><div class='docblock'><strong>This method is deprecated.</strong> <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.drop_span">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-Freeze-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a href="#impl-Freeze-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;N = <a class="struct" href="format/struct.DefaultFields.html" title="struct tracing_subscriber::fmt::format::DefaultFields">DefaultFields</a>, E = <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a>, F = <a class="struct" href="../filter/struct.LevelFilter.html" title="struct tracing_subscriber::filter::LevelFilter">LevelFilter</a>, W = <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.fn.html">fn</a>() -&gt; <a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/stdio/struct.Stdout.html" title="struct std::io::stdio::Stdout">Stdout</a>&gt; !<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;</h3></section><section id="impl-RefUnwindSafe-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a href="#impl-RefUnwindSafe-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;N, E, F, W&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
W: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
N: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
E: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a href="#impl-Send-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;N, E, F, W&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
W: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
N: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
E: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h3></section><section id="impl-Sync-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a href="#impl-Sync-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;N, E, F, W&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
W: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
N: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
E: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,</div></h3></section><section id="impl-Unpin-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a href="#impl-Unpin-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;N, E, F, W&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
W: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
N: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
E: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a href="#impl-UnwindSafe-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;N = <a class="struct" href="format/struct.DefaultFields.html" title="struct tracing_subscriber::fmt::format::DefaultFields">DefaultFields</a>, E = <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a>, F = <a class="struct" href="../filter/struct.LevelFilter.html" title="struct tracing_subscriber::filter::LevelFilter">LevelFilter</a>, W = <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.fn.html">fn</a>() -&gt; <a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/stdio/struct.Stdout.html" title="struct std::io::stdio::Stdout">Stdout</a>&gt; !<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;</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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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-SubscriberExt-for-S" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#1898">source</a><a href="#impl-SubscriberExt-for-S" class="anchor">§</a><h3 class="code-header">impl&lt;S&gt; <a class="trait" href="../layer/trait.SubscriberExt.html" title="trait tracing_subscriber::layer::SubscriberExt">SubscriberExt</a> for S<div class="where">where
S: <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#1501-1507">source</a><a href="#method.with" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.SubscriberExt.html#method.with" class="fn">with</a>&lt;L&gt;(self, layer: L) -&gt; <a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;L, Self&gt;<div class="where">where
L: <a class="trait" href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer">Layer</a>&lt;Self&gt;,
Self: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Wraps <code>self</code> with the provided <code>layer</code>.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-SubscriberInitExt-for-T" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/util.rs.html#95">source</a><a href="#impl-SubscriberInitExt-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="../util/trait.SubscriberInitExt.html" title="trait tracing_subscriber::util::SubscriberInitExt">SubscriberInitExt</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.set_default" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/util.rs.html#38-43">source</a><a href="#method.set_default" class="anchor">§</a><h4 class="code-header">fn <a href="../util/trait.SubscriberInitExt.html#method.set_default" class="fn">set_default</a>(self) -&gt; <a class="struct" href="../../tracing_core/dispatcher/struct.DefaultGuard.html" title="struct tracing_core::dispatcher::DefaultGuard">DefaultGuard</a></h4></section></summary><div class='docblock'>Sets <code>self</code> as the <a href="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">default subscriber</a> in the current scope, returning a
guard that will unset it when dropped. <a href="../util/trait.SubscriberInitExt.html#method.set_default">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.try_init" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/util.rs.html#58-74">source</a><a href="#method.try_init" class="anchor">§</a><h4 class="code-header">fn <a href="../util/trait.SubscriberInitExt.html#method.try_init" class="fn">try_init</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, <a class="struct" href="../util/struct.TryInitError.html" title="struct tracing_subscriber::util::TryInitError">TryInitError</a>&gt;</h4></section></summary><div class='docblock'>Attempts to set <code>self</code> as the <a href="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">global default subscriber</a> in the current
scope, returning an error if one is already set. <a href="../util/trait.SubscriberInitExt.html#method.try_init">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.init" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/util.rs.html#89-92">source</a><a href="#method.init" class="anchor">§</a><h4 class="code-header">fn <a href="../util/trait.SubscriberInitExt.html#method.init" class="fn">init</a>(self)</h4></section></summary><div class='docblock'>Attempts to set <code>self</code> as the <a href="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">global default subscriber</a> in the current
scope, panicking if this fails. <a href="../util/trait.SubscriberInitExt.html#method.init">Read more</a></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/1.80.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/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></section></div></main></body></html>