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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 no-op `Subscriber`."><title>NoSubscriber in tracing_core::subscriber - Rust</title><script> if (window.location.protocol !== "file:") document.write(`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2">`)</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-e935ef01ae1c1829.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing_core" data-themes="" data-resource-suffix="" data-rustdoc-version="1.78.0 (9b00956e5 2024-04-29)" data-channel="1.78.0" data-search-js="search-42d8da7a6b9792c2.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-4c98445ec4002617.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-12cf3b4f4f9dc36d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-04d5337699b92874.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../tracing_core/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_core/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing_core/index.html">tracing_core</a><span class="version">0.1.32</span></h2></div><h2 class="location"><a href="#">NoSubscriber</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><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-Clone-for-NoSubscriber">Clone</a></li><li><a href="#impl-Copy-for-NoSubscriber">Copy</a></li><li><a href="#impl-Debug-for-NoSubscriber">Debug</a></li><li><a href="#impl-Default-for-NoSubscriber">Default</a></li><li><a href="#impl-Subscriber-for-NoSubscriber">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-NoSubscriber">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-NoSubscriber">RefUnwindSafe</a></li><li><a href="#impl-Send-for-NoSubscriber">Send</a></li><li><a href="#impl-Sync-for-NoSubscriber">Sync</a></li><li><a href="#impl-Unpin-for-NoSubscriber">Unpin</a></li><li><a href="#impl-UnwindSafe-for-NoSubscriber">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-T">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T">Into<U></a></li><li><a href="#impl-ToOwned-for-T">ToOwned</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto<U></a></li></ul></section><h2><a href="index.html">In tracing_core::subscriber</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../tracing_core/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../index.html">tracing_core</a>::<wbr><a href="index.html">subscriber</a>::<wbr><a class="struct" href="#">NoSubscriber</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/tracing_core/subscriber.rs.html#675">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub struct NoSubscriber(<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 no-op <a href="../trait.Subscriber.html" title="trait tracing_core::Subscriber"><code>Subscriber</code></a>.</p>
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<p><a href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber"><code>NoSubscriber</code></a> implements the <a href="../trait.Subscriber.html" title="trait tracing_core::Subscriber"><code>Subscriber</code></a> trait by never being enabled,
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never being interested in any callsite, and dropping all spans and events.</p>
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</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-NoSubscriber" class="impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#702-708">source</a><a href="#impl-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#705-707">source</a><h4 class="code-header">pub const fn <a href="#method.new" class="fn">new</a>() -> Self</h4></section></summary><div class="docblock"><p>Returns a new <code>NoSubscriber</code>.</p>
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</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-Clone-for-NoSubscriber" class="impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#674">source</a><a href="#impl-Clone-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#674">source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&self) -> <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.78.0/src/core/clone.rs.html#169">source</a></span><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&Self</a>)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-NoSubscriber" class="impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#674">source</a><a href="#impl-Debug-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></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_core/subscriber.rs.html#674">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.78.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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-NoSubscriber" class="impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#674">source</a><a href="#impl-Default-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</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_core/subscriber.rs.html#674">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -> <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.78.0/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Subscriber-for-NoSubscriber" class="impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#677-700">source</a><a href="#impl-Subscriber-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="../trait.Subscriber.html" title="trait tracing_core::Subscriber">Subscriber</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></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_core/subscriber.rs.html#679-681">source</a><a href="#method.register_callsite" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#method.register_callsite" class="fn">register_callsite</a>(&self, _: &'static <a class="struct" href="../struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'static>) -> <a class="struct" href="struct.Interest.html" title="struct tracing_core::subscriber::Interest">Interest</a></h4></section></summary><div class='docblock'>Registers a new <a href="../callsite/index.html" title="mod tracing_core::callsite">callsite</a> with this subscriber, returning whether or not
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the subscriber is interested in being notified about the callsite. <a href="../trait.Subscriber.html#method.register_callsite">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_core/subscriber.rs.html#683-685">source</a><a href="#method.new_span" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#tymethod.new_span" class="fn">new_span</a>(&self, _: &<a class="struct" href="../span/struct.Attributes.html" title="struct tracing_core::span::Attributes">Attributes</a><'_>) -> <a class="struct" href="../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="../span/struct.Id.html" title="struct tracing_core::span::Id">span ID</a> for the
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span being constructed. <a href="../trait.Subscriber.html#tymethod.new_span">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_core/subscriber.rs.html#687">source</a><a href="#method.event" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#tymethod.event" class="fn">event</a>(&self, _event: &<a class="struct" href="../struct.Event.html" title="struct tracing_core::Event">Event</a><'_>)</h4></section></summary><div class='docblock'>Records that an <a href="../struct.Event.html" title="struct tracing_core::Event"><code>Event</code></a> has occurred. <a href="../trait.Subscriber.html#tymethod.event">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_core/subscriber.rs.html#689">source</a><a href="#method.record" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#tymethod.record" class="fn">record</a>(&self, _span: &<a class="struct" href="../span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, _values: &<a class="struct" href="../span/struct.Record.html" title="struct tracing_core::span::Record">Record</a><'_>)</h4></section></summary><div class='docblock'>Record a set of values on a span. <a href="../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_core/subscriber.rs.html#691">source</a><a href="#method.record_follows_from" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#tymethod.record_follows_from" class="fn">record_follows_from</a>(&self, _span: &<a class="struct" href="../span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, _follows: &<a class="struct" href="../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
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<code>follows</code>. <a href="../trait.Subscriber.html#tymethod.record_follows_from">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_core/subscriber.rs.html#694-696">source</a><a href="#method.enabled" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#tymethod.enabled" class="fn">enabled</a>(&self, _metadata: &<a class="struct" href="../struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'_>) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Returns true if a span or event with the specified <a href="../struct.Metadata.html" title="struct tracing_core::Metadata">metadata</a> would be
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recorded. <a href="../trait.Subscriber.html#tymethod.enabled">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_core/subscriber.rs.html#698">source</a><a href="#method.enter" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#tymethod.enter" class="fn">enter</a>(&self, _span: &<a class="struct" href="../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="../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_core/subscriber.rs.html#699">source</a><a href="#method.exit" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#tymethod.exit" class="fn">exit</a>(&self, _span: &<a class="struct" href="../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="../trait.Subscriber.html#tymethod.exit">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#103-105">source</a><a href="#method.on_register_dispatch" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#method.on_register_dispatch" class="fn">on_register_dispatch</a>(&self, subscriber: &<a class="struct" href="../struct.Dispatch.html" title="struct tracing_core::Dispatch">Dispatch</a>)</h4></section></summary><div class='docblock'>Invoked when this subscriber becomes a <a href="../struct.Dispatch.html" title="struct tracing_core::Dispatch"><code>Dispatch</code></a>. <a href="../trait.Subscriber.html#method.on_register_dispatch">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_core/subscriber.rs.html#230-232">source</a><a href="#method.max_level_hint" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#method.max_level_hint" class="fn">max_level_hint</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../struct.LevelFilter.html" title="struct tracing_core::LevelFilter">LevelFilter</a>></h4></section></summary><div class='docblock'>Returns the highest <a href="../struct.Level.html" title="struct tracing_core::Level">verbosity level</a> that this <code>Subscriber</code> will
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enable, or <code>None</code>, if the subscriber does not implement level-based
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filtering or chooses not to implement this method. <a href="../trait.Subscriber.html#method.max_level_hint">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_core/subscriber.rs.html#326-329">source</a><a href="#method.event_enabled" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#method.event_enabled" class="fn">event_enabled</a>(&self, event: &<a class="struct" href="../struct.Event.html" title="struct tracing_core::Event">Event</a><'_>) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Determine if an <a href="../struct.Event.html" title="struct tracing_core::Event"><code>Event</code></a> should be recorded. <a href="../trait.Subscriber.html#method.event_enabled">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_core/subscriber.rs.html#393-395">source</a><a href="#method.clone_span" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#method.clone_span" class="fn">clone_span</a>(&self, id: &<a class="struct" href="../span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="struct" href="../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="../span/struct.Id.html" title="struct tracing_core::span::Id">span ID</a> has been cloned. <a href="../trait.Subscriber.html#method.clone_span">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="../trait.Subscriber.html#method.drop_span" class="fn">drop_span</a>(&self, _id: <a class="struct" href="../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="../trait.Subscriber.html#method.drop_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_core/subscriber.rs.html#445-449">source</a><a href="#method.try_close" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#method.try_close" class="fn">try_close</a>(&self, id: <a class="struct" href="../span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Notifies the subscriber that a <a href="../span/struct.Id.html" title="struct tracing_core::span::Id">span ID</a> has been dropped, and returns
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<code>true</code> if there are now 0 IDs that refer to that span. <a href="../trait.Subscriber.html#method.try_close">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_core/subscriber.rs.html#464-466">source</a><a href="#method.current_span" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Subscriber.html#method.current_span" class="fn">current_span</a>(&self) -> <a class="struct" href="../span/struct.Current.html" title="struct tracing_core::span::Current">Current</a></h4></section></summary><div class='docblock'>Returns a type representing this subscriber’s view of the current span. <a href="../trait.Subscriber.html#method.current_span">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_core/subscriber.rs.html#495-501">source</a><a href="#method.downcast_raw" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="../trait.Subscriber.html#method.downcast_raw" class="fn">downcast_raw</a>(&self, id: <a class="struct" href="https://doc.rust-lang.org/1.78.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.pointer.html">*const </a><a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.unit.html">()</a>></h4></section></summary><div class='docblock'>If <code>self</code> is the same type as the provided <code>TypeId</code>, returns an untyped
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<code>*const</code> pointer to that type. Otherwise, returns <code>None</code>. <a href="../trait.Subscriber.html#method.downcast_raw">Read more</a></div></details></div></details><section id="impl-Copy-for-NoSubscriber" class="impl"><a class="src rightside" href="../../src/tracing_core/subscriber.rs.html#674">source</a><a href="#impl-Copy-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section></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-NoSubscriber" class="impl"><a href="#impl-Freeze-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section><section id="impl-RefUnwindSafe-for-NoSubscriber" class="impl"><a href="#impl-RefUnwindSafe-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section><section id="impl-Send-for-NoSubscriber" class="impl"><a href="#impl-Send-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section><section id="impl-Sync-for-NoSubscriber" class="impl"><a href="#impl-Sync-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section><section id="impl-Unpin-for-NoSubscriber" class="impl"><a href="#impl-Unpin-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section><section id="impl-UnwindSafe-for-NoSubscriber" class="impl"><a href="#impl-UnwindSafe-for-NoSubscriber" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.NoSubscriber.html" title="struct tracing_core::subscriber::NoSubscriber">NoSubscriber</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.78.0/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/1.78.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.78.0/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/1.78.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code><a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/alloc/borrow.rs.html#83-85">source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.78.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/alloc/borrow.rs.html#88">source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&self) -> T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.78.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/alloc/borrow.rs.html#92">source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&self, target: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.78.0/alloc/borrow/trait.ToOwned.html#method.clone_into">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/1.78.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html> |