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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="Provides the current span context to a formatter."><title>FmtContext 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="#">FmtContext</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.current_span">current_span</a></li><li><a href="#method.event_scope">event_scope</a></li><li><a href="#method.exists">exists</a></li><li><a href="#method.field_format">field_format</a></li><li><a href="#method.lookup_current">lookup_current</a></li><li><a href="#method.metadata">metadata</a></li><li><a href="#method.parent_span">parent_span</a></li><li><a href="#method.span">span</a></li><li><a href="#method.span_scope">span_scope</a></li><li><a href="#method.visit_spans">visit_spans</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-FmtContext%3C'a,+S,+N%3E">Debug</a></li><li><a href="#impl-FormatFields%3C'writer%3E-for-FmtContext%3C'cx,+S,+N%3E">FormatFields<'writer></a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-RefUnwindSafe-for-FmtContext%3C'a,+S,+N%3E">!RefUnwindSafe</a></li><li><a href="#impl-Send-for-FmtContext%3C'a,+S,+N%3E">!Send</a></li><li><a href="#impl-Sync-for-FmtContext%3C'a,+S,+N%3E">!Sync</a></li><li><a href="#impl-UnwindSafe-for-FmtContext%3C'a,+S,+N%3E">!UnwindSafe</a></li><li><a href="#impl-Freeze-for-FmtContext%3C'a,+S,+N%3E">Freeze</a></li><li><a href="#impl-Unpin-for-FmtContext%3C'a,+S,+N%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<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-Instrument-for-T">Instrument</a></li><li><a href="#impl-Into%3CU%3E-for-T">Into<U></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><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="#">FmtContext</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/fmt_layer.rs.html#1011-1015">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub struct FmtContext<'a, S, N> { <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>Provides the current span context to a formatter.</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-FmtContext%3C'a,+S,+N%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1037-1200">source</a><a href="#impl-FmtContext%3C'a,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'a, S, N> <a class="struct" href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'a, S, N><div class="where">where
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S: <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a> + for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,
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N: for<'writer> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.visit_spans" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1047-1058">source</a><h4 class="code-header">pub fn <a href="#method.visit_spans" class="fn">visit_spans</a><E, F>(&self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, E><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a><'_, S>) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, E>,</div></h4></section></summary><div class="docblock"><p>Visits every span in the current context with a closure.</p>
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<p>The provided closure will be called first with the current span,
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and then with that span’s parent, and then that span’s parent,
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and so on until a root span is reached.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.metadata" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1065-1070">source</a><h4 class="code-header">pub fn <a href="#method.metadata" class="fn">metadata</a>(&self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'static <a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a><'static>><div class="where">where
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S: for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,</div></h4></section></summary><div class="docblock"><p>Returns metadata for the span with the given <code>id</code>, if it exists.</p>
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<p>If this returns <code>None</code>, then no span exists for that ID (either it has
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closed or the ID is invalid).</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.span" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1079-1084">source</a><h4 class="code-header">pub fn <a href="#method.span" class="fn">span</a>(&self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a><'_, S>><div class="where">where
|
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S: for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,</div></h4></section></summary><div class="docblock"><p>Returns <a href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">stored data</a> for the span with the given <code>id</code>, if it exists.</p>
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<p>If this returns <code>None</code>, then no span exists for that ID (either it has
|
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closed or the ID is invalid).</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.exists" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1088-1093">source</a><h4 class="code-header">pub fn <a href="#method.exists" class="fn">exists</a>(&self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a><div class="where">where
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S: for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,</div></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if an active span exists for the given <code>Id</code>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.lookup_current" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1102-1107">source</a><h4 class="code-header">pub fn <a href="#method.lookup_current" class="fn">lookup_current</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a><'_, S>><div class="where">where
|
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S: for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,</div></h4></section></summary><div class="docblock"><p>Returns <a href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">stored data</a> for the span that the wrapped subscriber considers
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to be the current.</p>
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<p>If this returns <code>None</code>, then we are not currently within a span.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.current_span" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1110-1112">source</a><h4 class="code-header">pub fn <a href="#method.current_span" class="fn">current_span</a>(&self) -> <a class="struct" href="../../tracing_core/span/struct.Current.html" title="struct tracing_core::span::Current">Current</a></h4></section></summary><div class="docblock"><p>Returns the current span for this formatter.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.parent_span" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1122-1124">source</a><h4 class="code-header">pub fn <a href="#method.parent_span" class="fn">parent_span</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a><'_, S>></h4></section></summary><div class="docblock"><p>Returns <a href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">stored data</a> for the parent span of the event currently being
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formatted.</p>
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<p>If the event has a contextual parent, this will return the current span. If
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the event has an explicit parent span, this will return that span. If
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the event does not have a parent span, this will return <code>None</code>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.span_scope" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1152-1157">source</a><h4 class="code-header">pub fn <a href="#method.span_scope" class="fn">span_scope</a>(&self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../registry/struct.Scope.html" title="struct tracing_subscriber::registry::Scope">Scope</a><'_, S>><div class="where">where
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S: for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over the <a href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">stored data</a> for all the spans in the
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current context, starting with the specified span and ending with the
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root of the trace tree and ending with the current span.</p>
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<p>This is equivalent to the <a href="../layer/struct.Context.html#method.span_scope" title="method tracing_subscriber::layer::Context::span_scope"><code>Context::span_scope</code></a> method.</p>
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<div class="information">
|
||
<div class="tooltip ignore" style="">ⓘ<span class="tooltiptext">Note</span></div>
|
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</div>
|
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<div class="example-wrap" style="display:inline-block">
|
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<pre class="ignore" style="white-space:normal;font:inherit;">
|
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<strong>Note</strong>: Compared to <a href="#method.scope"><code>scope</code></a> this
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returns the spans in reverse order (from leaf to root). Use
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<a href="../registry/struct.Scope.html#method.from_root"><code>Scope::from_root</code></a>
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in case root-to-leaf ordering is desired.
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</pre></div>
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<div class="example-wrap" style="display:inline-block">
|
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<pre class="ignore" style="white-space:normal;font:inherit;">
|
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<strong>Note</strong>: This requires the wrapped subscriber to implement the
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<a href="../registry/trait.LookupSpan.html"><code>LookupSpan</code></a> trait.
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See the documentation on <a href="./struct.Context.html"><code>Context</code>'s
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declaration</a> for details.
|
||
</pre></div>
|
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</div></details><details class="toggle method-toggle" open><summary><section id="method.event_scope" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1183-1188">source</a><h4 class="code-header">pub fn <a href="#method.event_scope" class="fn">event_scope</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../registry/struct.Scope.html" title="struct tracing_subscriber::registry::Scope">Scope</a><'_, S>><div class="where">where
|
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S: for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over the <a href="../registry/struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">stored data</a> for all the spans in the
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event’s span context, starting with its parent span and ending with the
|
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root of the trace tree.</p>
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<p>This is equivalent to calling the <a href="../layer/struct.Context.html#method.event_scope" title="method tracing_subscriber::layer::Context::event_scope"><code>Context::event_scope</code></a> method and
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||
passing the event currently being formatted.</p>
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<div class="example-wrap" style="display:inline-block">
|
||
<pre class="ignore" style="white-space:normal;font:inherit;">
|
||
<strong>Note</strong>: Compared to <a href="#method.scope"><code>scope</code></a> this
|
||
returns the spans in reverse order (from leaf to root). Use
|
||
<a href="../registry/struct.Scope.html#method.from_root"><code>Scope::from_root</code></a>
|
||
in case root-to-leaf ordering is desired.
|
||
</pre></div>
|
||
<div class="example-wrap" style="display:inline-block">
|
||
<pre class="ignore" style="white-space:normal;font:inherit;">
|
||
<strong>Note</strong>: This requires the wrapped subscriber to implement the
|
||
<a href="../registry/trait.LookupSpan.html"><code>LookupSpan</code></a> trait.
|
||
See the documentation on <a href="./struct.Context.html"><code>Context</code>'s
|
||
declaration</a> for details.
|
||
</pre></div>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.field_format" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1197-1199">source</a><h4 class="code-header">pub fn <a href="#method.field_format" class="fn">field_format</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&N</a></h4></section></summary><div class="docblock"><p>Returns the <a href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">field formatter</a> configured by the subscriber invoking
|
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<code>format_event</code>.</p>
|
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<p>The event formatter may use the returned field formatter to format the
|
||
fields of any events it records.</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-FmtContext%3C'a,+S,+N%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1017-1021">source</a><a href="#impl-Debug-for-FmtContext%3C'a,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'a, S, 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> for <a class="struct" href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'a, S, N></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/fmt_layer.rs.html#1018-1020">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>(&self, f: &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><'_>) -> <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-FormatFields%3C'writer%3E-for-FmtContext%3C'cx,+S,+N%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1023-1035">source</a><a href="#impl-FormatFields%3C'writer%3E-for-FmtContext%3C'cx,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'cx, 'writer, S, N> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> for <a class="struct" href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'cx, S, N><div class="where">where
|
||
S: <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a> + for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,
|
||
N: <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.format_fields" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1028-1034">source</a><a href="#method.format_fields" class="anchor">§</a><h4 class="code-header">fn <a href="trait.FormatFields.html#tymethod.format_fields" class="fn">format_fields</a><R: <a class="trait" href="../field/trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a>>(
|
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&self,
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writer: <a class="struct" href="format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a><'writer>,
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fields: R,
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) -> <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'>Format the provided <code>fields</code> to the provided <a href="format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer"><code>Writer</code></a>, returning a result.</div></details><details class="toggle method-toggle" open><summary><section id="method.add_fields" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#241-250">source</a><a href="#method.add_fields" class="anchor">§</a><h4 class="code-header">fn <a href="trait.FormatFields.html#method.add_fields" class="fn">add_fields</a>(
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&self,
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current: &'writer mut <a class="struct" href="struct.FormattedFields.html" title="struct tracing_subscriber::fmt::FormattedFields">FormattedFields</a><Self>,
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fields: &<a class="struct" href="../../tracing_core/span/struct.Record.html" title="struct tracing_core::span::Record">Record</a><'_>,
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) -> <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'>Record additional field(s) on an existing span. <a href="trait.FormatFields.html#method.add_fields">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-FmtContext%3C'a,+S,+N%3E" class="impl"><a href="#impl-Freeze-for-FmtContext%3C'a,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'a, S, N> <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.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'a, S, N></h3></section><section id="impl-RefUnwindSafe-for-FmtContext%3C'a,+S,+N%3E" class="impl"><a href="#impl-RefUnwindSafe-for-FmtContext%3C'a,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'a, S, 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> for <a class="struct" href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'a, S, N></h3></section><section id="impl-Send-for-FmtContext%3C'a,+S,+N%3E" class="impl"><a href="#impl-Send-for-FmtContext%3C'a,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'a, S, 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> for <a class="struct" href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'a, S, N></h3></section><section id="impl-Sync-for-FmtContext%3C'a,+S,+N%3E" class="impl"><a href="#impl-Sync-for-FmtContext%3C'a,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'a, S, 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> for <a class="struct" href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'a, S, N></h3></section><section id="impl-Unpin-for-FmtContext%3C'a,+S,+N%3E" class="impl"><a href="#impl-Unpin-for-FmtContext%3C'a,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'a, S, 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> for <a class="struct" href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'a, S, N></h3></section><section id="impl-UnwindSafe-for-FmtContext%3C'a,+S,+N%3E" class="impl"><a href="#impl-UnwindSafe-for-FmtContext%3C'a,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'a, S, N> !<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.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'a, S, N></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<T> <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
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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>(&self) -> <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<T> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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<T> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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<T> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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) -> 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-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<T> <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>) -> <a class="struct" href="../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a><Self></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
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<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) -> <a class="struct" href="../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a><Self></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
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<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<T, 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><U> for T<div class="where">where
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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><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/1.80.0/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) -> 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/1.80.0/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-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<T, 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><U> for T<div class="where">where
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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><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/1.80.0/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) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<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'>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<T, U> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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-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> = <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><T>>::<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) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<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'>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<T> <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><S>(self, subscriber: S) -> <a class="struct" href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self><div class="where">where
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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><<a class="struct" href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>>,</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
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<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) -> <a class="struct" href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self></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
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<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> |