<p>This consists of an inner <code>Formatter</code> wrapped in a layer that performs filtering.</p>
</div></details><h2id="implementations"class="section-header">Implementations<ahref="#implementations"class="anchor">§</a></h2><divid="implementations-list"><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Subscriber"class="impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#338-357">source</a><ahref="#impl-Subscriber"class="anchor">§</a><h3class="code-header">impl <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedconstant.DEFAULT_MAX_LEVEL"class="associatedconstant"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#346">source</a><h4class="code-header">pub const <ahref="#associatedconstant.DEFAULT_MAX_LEVEL"class="constant">DEFAULT_MAX_LEVEL</a>: <aclass="struct"href="../filter/struct.LevelFilter.html"title="struct tracing_subscriber::filter::LevelFilter">LevelFilter</a> = LevelFilter::INFO</h4></section></summary><divclass="docblock"><p>The maximum <ahref="../../tracing_core/metadata/struct.Level.html"title="struct tracing_core::metadata::Level">verbosity level</a> that is enabled by a <code>Subscriber</code> by
default.</p>
<p>This can be overridden with the <ahref="struct.SubscriberBuilder.html#method.with_max_level"title="method tracing_subscriber::fmt::SubscriberBuilder::with_max_level"><code>SubscriberBuilder::with_max_level</code></a> method.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.builder"class="method"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#349-351">source</a><h4class="code-header">pub fn <ahref="#method.builder"class="fn">builder</a>() -><aclass="struct"href="struct.SubscriberBuilder.html"title="struct tracing_subscriber::fmt::SubscriberBuilder">SubscriberBuilder</a></h4></section></summary><divclass="docblock"><p>Returns a new <code>SubscriberBuilder</code> for configuring a format subscriber.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.new"class="method"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#354-356">source</a><h4class="code-header">pub fn <ahref="#method.new"class="fn">new</a>() -> Self</h4></section></summary><divclass="docblock"><p>Returns a new format subscriber with the default configuration.</p>
</div></details></div></details></div><h2id="trait-implementations"class="section-header">Trait Implementations<ahref="#trait-implementations"class="anchor">§</a></h2><divid="trait-implementations-list"><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Debug-for-Subscriber%3CN,+E,+F,+W%3E"class="impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#224">source</a><ahref="#impl-Debug-for-Subscriber%3CN,+E,+F,+W%3E"class="anchor">§</a><h3class="code-header">impl<N: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a>, E: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a>, F: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a>, W: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a>><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a> for <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a><N, E, F, W></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.fmt"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#224">source</a><ahref="#method.fmt"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt"class="fn">fmt</a>(&self, f: &mut <aclass="struct"href="https://doc.rust-lang.org/1.80.0/core/fmt/struct.Formatter.html"title="struct core::fmt::Formatter">Formatter</a><'_>) -><aclass="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><divclass='docblock'>Formats the value using the given formatter. <ahref="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Default-for-Subscriber"class="impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#359-363">source</a><ahref="#impl-Default-for-Subscriber"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html"title="trait core::default::Default">Default</a> for <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.default"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#360-362">source</a><ahref="#method.default"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html#tymethod.default"class="fn">default</a>() -> Self</h4></section></summary><divclass='docblock'>Returns the “default value” for a type. <ahref="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-LookupSpan%3C'a%3E-for-Subscriber%3CN,+E,+F,+W%3E"class="impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#451-460">source</a><ahref="#impl-LookupSpan%3C'a%3E-for-Subscriber%3CN,+E,+F,+W%3E"class="anchor">§</a><h3class="code-header">impl<'a, N, E, F, W><aclass="trait"href="../registry/trait.LookupSpan.html"title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a> for <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscri
<aclass="struct"href="../layer/struct.Layered.html"title="struct tracing_subscriber::layer::Layered">Layered</a><F, <aclass="type"href="type.Formatter.html"title="type tracing_subscriber::fmt::Formatter">Formatter</a><N, E, W>>: <aclass="trait"href="../registry/trait.LookupSpan.html"title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Data"class="associatedtype trait-impl"><ahref="#associatedtype.Data"class="anchor">§</a><h4class="code-header">type <ahref="../registry/trait.LookupSpan.html#associatedtype.Data"class="associatedtype">Data</a> = <<aclass="struct"href="../layer/struct.Layered.html"title="struct tracing_subscriber::layer::Layered">Layered</a><F, <aclass="struct"href="../layer/struct.Layered.html"title="struct tracing_subscriber::layer::Layered">Layered</a><<aclass="struct"href="struct.Layer.html"title="struct tracing_subscriber::fmt::Layer">Layer</a><<aclass="struct"href="../registry/struct.Registry.html"title="struct tracing_subscriber::registry::Registry">Registry</a>, N, E, W>, <aclass="struct"href="../registry/struct.Registry.html"title="struct tracing_subscriber::registry::Registry">Registry</a>>> as <aclass="trait"href="../registry/trait.LookupSpan.html"title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a>>::<aclass="associatedtype"href="../registry/trait.LookupSpan.html#associatedtype.Data"title="type tracing_subscriber::registry::LookupSpan::Data">Data</a></h4></section></summary><divclass='docblock'>The type of span data stored in this registry.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.span_data"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#457-459">source</a><ahref="#method.span_data"class="anchor">§</a><h4class="code-header">fn <ahref="../registry/trait.LookupSpan.html#tymethod.span_data"class="fn">span_data</a>(&'a self, id: &<aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a>) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><Self::<aclass="associatedtype"href="../registry/trait.LookupSpan.html#associatedtype.Data"title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>></h4></section></summary><divclass='docblock'>Returns the <ahref="../registry/trait.SpanData.html"title="trait tracing_subscriber::registry::SpanData"><code>SpanData</code></a> for a given <code>Id</code>, if it exists.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.span"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/registry/mod.rs.html#118-129">source</a><ahref="#method.span"class="anchor">§</a><h4class="code-header">fn <ahref="../registry/trait.LookupSpan.html#method.span"class="fn">span</a>(&'a self, id: &<aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a>) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../registry/struct.SpanRef.html"title="struct tracing_subscriber::registry::SpanRef">SpanRef</a><'_, Self>><divclass="where">where
Self: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><divclass='docblock'>Returns a <ahref="../registry/struct.SpanRef.html"title="struct tracing_subscriber::registry::SpanRef"><code>SpanRef</code></a> for the span with the given <code>Id</code>, if it exists. <ahref="../registry/trait.LookupSpan.html#method.span">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.register_filter"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/registry/mod.rs.html#148-153">source</a><ahref="#method.register_filter"class="anchor">§</a><h4class="code-header">fn <ahref="../registry/trait.LookupSpan.html#method.register_filter"class="fn">register_filter</a>(&mut self) -><aclass="struct"href="../filter/struct.FilterId.html"title="struct tracing_subscriber::filter::FilterId">FilterId</a></h4></section></summary><divclass='docblock'>Registers a <ahref="../layer/trait.Filter.html"title="trait tracing_subscriber::layer::Filter"><code>Filter</code></a> for <ahref="../layer/trait.Layer.html#per-layer-filtering"title="trait tracing_subscriber::layer::Layer">per-layer filtering</a> with this
<aclass="struct"href="../layer/struct.Layered.html"title="struct tracing_subscriber::layer::Layered">Layered</a><F, <aclass="type"href="type.Formatter.html"title="type tracing_subscriber::fmt::Formatter">Formatter</a><N, E, W>>: <aclass="trait"href="../../tracing_core/subscriber/trait.Subscriber.html"title="trait tracing_core::subscriber::Subscriber">Subscriber</a>,
<aclass="struct"href="struct.Layer.html"title="struct tracing_subscriber::fmt::Layer">Layer</a><<aclass="struct"href="../registry/struct.Registry.html"title="struct tracing_subscriber::registry::Registry">Registry</a>, N, E, W>: <aclass="trait"href="../layer/trait.Layer.html"title="trait tracing_subscriber::layer::Layer">Layer</a><<aclass="struct"href="../registry/struct.Registry.html"title="struct tracing_subscriber::registry::Registry">Registry</a>>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.register_callsite"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#377-379">source</a><ahref="#method.register_callsite"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.register_callsite"class="fn">register_callsite</a>(&self, meta: &'static <aclass="struct"href="../../tracing_core/metadata/struct.Metadata.html"title="struct tracing_core::metadata::Metadata">Metadata</a><'static>) -><aclass="struct"href="../../tracing_core/subscriber/struct.Interest.html"title="struct tracing_core::subscriber::Interest">Interest</a></h4></section></summary><divclass='docblock'>Registers a new <ahref="../../tracing_core/callsite/index.html"title="mod tracing_core::callsite">callsite</a> with this subscriber, returning whether or not
the subscriber is interested in being notified about the callsite. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.register_callsite">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.enabled"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#382-384">source</a><ahref="#method.enabled"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enabled"class="fn">enabled</a>(&self, meta: &<aclass="struct"href="../../tracing_core/metadata/struct.Metadata.html"title="struct tracing_core::metadata::Metadata">Metadata</a><'_>) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>Returns true if a span or event with the specified <ahref="../../tracing_core/metadata/struct.Metadata.html"title="struct tracing_core::metadata::Metadata">metadata</a> would be
recorded. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enabled">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.new_span"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#387-389">source</a><ahref="#method.new_span"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.new_span"class="fn">new_span</a>(&self, attrs: &<aclass="struct"href="../../tracing_core/span/struct.Attributes.html"title="struct tracing_core::span::Attributes">Attributes</a><'_>) -><aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a></h4></section></summary><divclass='docblock'>Visit the construction of a new span, returning a new <ahref="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">span ID</a> for the
span being constructed. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.new_span">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.record"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#392-394">source</a><ahref="#method.record"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record"class="fn">record</a>(&self, span: &<aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a>, values: &<aclass="struct"href="../../tracing_core/span/struct.Record.html"title="struct tracing_core::span::Record">Record</a><'_>)</h4></section></summary><divclass='docblock'>Record a set of values on a span. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.record_follows_from"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#397-399">source</a><ahref="#method.record_follows_from"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record_follows_from"class="fn">record_follows_from</a>(&self, span: &<aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a>, follows: &<aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a>)</h4></section></summary><divclass='docblock'>Adds an indication that <code>span</code> follows from the span with the id
<code>follows</code>. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record_follows_from">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.event_enabled"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#402-404">source</a><ahref="#method.event_enabled"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.event_enabled"class="fn">event_enabled</a>(&self, event: &<aclass="struct"href="../../tracing_core/event/struct.Event.html"title="struct tracing_core::event::Event">Event</a><'_>) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>Determine if an <ahref="../../tracing_core/event/struct.Event.html"title="struct tracing_core::event::Event"><code>Event</code></a> should be recorded. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.event_enabled">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.event"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#407-409">source</a><ahref="#method.event"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.event"class="fn">event</a>(&self, event: &<aclass="struct"href="../../tracing_core/event/struct.Event.html"title="struct tracing_core::event::Event">Event</a><'_>)</h4></section></summary><divclass='docblock'>Records that an <ahref="../../tracing_core/event/struct.Event.html"title="struct tracing_core::event::Event"><code>Event</code></a> has occurred. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.event">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.enter"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#412-415">source</a><ahref="#method.enter"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enter"class="fn">enter</a>(&self, id: &<aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a>)</h4></section></summary><divclass='docblock'>Records that a span has been entered. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enter">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.exit"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#418-420">source</a><ahref="#method.exit"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.exit"class="fn">exit</a>(&self, id: &<aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a>)</h4></section></summary><divclass='docblock'>Records that a span has been exited. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.exit">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.current_span"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#423-425">source</a><ahref="#method.current_span"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.current_span"class="fn">current_span</a>(&self) -><aclass="struct"href="../../tracing_core/span/struct.Current.html"title="struct tracing_core::span::Current">Current</a></h4></section></summary><divclass='docblock'>Returns a type representing this subscriber’s view of the current span. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.current_span">Read more</a></div></details><detailsclass="toggl
<code>true</code> if there are now 0 IDs that refer to that span. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.try_close">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.max_level_hint"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#438-440">source</a><ahref="#method.max_level_hint"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.max_level_hint"class="fn">max_level_hint</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../filter/struct.LevelFilter.html"title="struct tracing_subscriber::filter::LevelFilter">LevelFilter</a>></h4></section></summary><divclass='docblock'>Returns the highest <ahref="../../tracing_core/metadata/struct.Level.html"title="struct tracing_core::metadata::Level">verbosity level</a> that this <code>Subscriber</code> will
filtering or chooses not to implement this method. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.max_level_hint">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.downcast_raw"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/fmt/mod.rs.html#442-448">source</a><ahref="#method.downcast_raw"class="anchor">§</a><h4class="code-header">unsafe fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.downcast_raw"class="fn">downcast_raw</a>(&self, id: <aclass="struct"href="https://doc.rust-lang.org/1.80.0/core/any/struct.TypeId.html"title="struct core::any::TypeId">TypeId</a>) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.pointer.html">*const </a><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>></h4></section></summary><divclass='docblock'>If <code>self</code> is the same type as the provided <code>TypeId</code>, returns an untyped
<code>*const</code> pointer to that type. Otherwise, returns <code>None</code>. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.downcast_raw">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.on_register_dispatch"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_core/subscriber.rs.html#103">source</a><ahref="#method.on_register_dispatch"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.on_register_dispatch"class="fn">on_register_dispatch</a>(&self, subscriber: &<aclass="struct"href="../../tracing_core/dispatcher/struct.Dispatch.html"title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>)</h4></section></summary><divclass='docblock'>Invoked when this subscriber becomes a <ahref="../../tracing_core/dispatcher/struct.Dispatch.html"title="struct tracing_core::dispatcher::Dispatch"><code>Dispatch</code></a>. <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.on_register_dispatch">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.drop_span"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_core/subscriber.rs.html#407">source</a><ahref="#method.drop_span"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.drop_span"class="fn">drop_span</a>(&self, _id: <aclass="struct"href="../../tracing_core/span/struct.Id.html"title="struct tracing_core::span::Id">Id</a>)</h4></section></summary><spanclass="item-info"><divclass="stab deprecated"><spanclass="emoji">👎</span><span>Deprecated since 0.1.2: use <code>Subscriber::try_close</code> instead</span></div></span><divclass='docblock'><strong>This method is deprecated.</strong><ahref="../../tracing_core/subscriber/trait.Subscriber.html#method.drop_span">Read more</a></div></details></div></details></div><h2id="synthetic-implementations"class="section-header">Auto Trait Implementations<ahref="#synthetic-implementations"class="anchor">§</a></h2><divid="synthetic-implementations-list"><sectionid="impl-Freeze-for-Subscriber%3CN,+E,+F,+W%3E"class="impl"><ahref="#impl-Freeze-for-Subscriber%3CN,+E,+F,+W%3E"class="anchor">§</a><h3class="code-header">impl<N = <aclass="struct"href="format/struct.DefaultFields.html"title="struct tracing_subscriber::fmt::format::DefaultFields">DefaultFields</a>, E = <aclass="struct"href="format/struct.Format.html"title="struct tracing_subscriber::fmt::format::Format">Format</a>, F = <aclass="struct"href="../filter/struct.LevelFilter.html"title="struct tracing_subscriber::filter::LevelFilter">LevelFilter</a>, W = <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.fn.html">fn</a>() -><aclass="struct"href="https://doc.rust-lang.org/1.80.0/std/io/stdio/struct.Stdout.html"title="struct std::io::stdio::Stdout">Stdout</a>> !<aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Freeze.html"title="trait core::marker::Freeze">Freeze</a> for <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a><N, E, F, W></h3></section><sectionid="impl-RefUnwindSafe-for-Subscriber%3CN,+E,+F,+W%3E"class="impl"><ahref="#impl-RefUnwindSafe-for-Subscriber%3CN,+E,+F,+W%3E"class="anchor">§</a><h3class="code-header">impl<N, E, F, W><aclass="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 <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a><N, E, F, W><divclass="where">where
E: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html"title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><sectionid="impl-Send-for-Subscriber%3CN,+E,+F,+W%3E"class="impl"><ahref="#impl-Send-for-Subscriber%3CN,+E,+F,+W%3E"class="anchor">§</a><h3class="code-header">impl<N, E, F, W><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a> for <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a><N, E, F, W><divclass="where">where
E: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a>,</div></h3></section><sectionid="impl-Sync-for-Subscriber%3CN,+E,+F,+W%3E"class="impl"><ahref="#impl-Sync-for-Subscriber%3CN,+E,+F,+W%3E"class="anchor">§</a><h3class="code-header">impl<N, E, F, W><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a> for <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a><N, E, F, W><divclass="where">where
E: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a>,</div></h3></section><sectionid="impl-Unpin-for-Subscriber%3CN,+E,+F,+W%3E"class="impl"><ahref="#impl-Unpin-for-Subscriber%3CN,+E,+F,+W%3E"class="anchor">§</a><h3class="code-header">impl<N, E, F, W><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html"title="trait core::marker::Unpin">Unpin</a> for <aclass="struct"href="struct.Subscriber.html"title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a><N, E, F, W><divclass="where">where
</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-Instrument-for-T"class="impl"><aclass="src rightside"href="../../src/tracing/instrument.rs.html#325">source</a><ahref="#impl-Instrument-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="../../tracing/instrument/trait.Instrument.html"title="trait tracing::instrument::Instrument">Instrument</a> for T</h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.instrument"class="method trait-impl"><aclass="src rightside"href="../../src/tracing/instrument.rs.html#86">source</a><ahref="#method.instrument"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing/instrument/trait.Instrument.html#method.instrument"class="fn">instrument</a>(self, span: <aclass="struct"href="../../tracing/span/struct.Span.html"title="struct tracing::span::Span">Span</a>) -><aclass="struct"href="../../tracing/instrument/struct.Instrumented.html"title="struct tracing::instrument::Instrumented">Instrumented</a><Self></h4></section></summary><divclass='docblock'>Instruments this type with the provided <ahref="../../tracing/span/struct.Span.html"title="struct tracing::span::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <ahref="../../tracing/instrument/trait.Instrument.html#method.instrument">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.in_current_span"class="method trait-impl"><aclass="src rightside"href="../../src/tracing/instrument.rs.html#128">source</a><ahref="#method.in_current_span"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing/instrument/trait.Instrument.html#method.in_current_span"class="fn">in_current_span</a>(self) -><aclass="struct"href="../../tracing/instrument/struct.Instrumented.html"title="struct tracing::instrument::Instrumented">Instrumented</a><Self></h4></section></summary><divclass='docblock'>Instruments this type with the <ahref="../../tracing/span/struct.Span.html#method.current"title="associated function tracing::span::Span::current">current</a><ahref="../../tracing/span/struct.Span.html"title="struct tracing::span::Span"><code>Span</code></a>, returning an
<code><ahref="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>
Self: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><divclass='docblock'>Wraps <code>self</code> with the provided <code>layer</code>.</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-SubscriberInitExt-for-T"class="impl"><aclass="src rightside"href="../../src/tracing_subscriber/util.rs.html#95">source</a><ahref="#impl-SubscriberInitExt-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="../util/trait.SubscriberInitExt.html"title="trait tracing_subscriber::util::SubscriberInitExt">SubscriberInitExt</a> for T<divclass="where">where
T: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="struct"href="../../tracing_core/dispatcher/struct.Dispatch.html"title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.set_default"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/util.rs.html#38-43">source</a><ahref="#method.set_default"class="anchor">§</a><h4class="code-header">fn <ahref="../util/trait.SubscriberInitExt.html#method.set_default"class="fn">set_default</a>(self) -><aclass="struct"href="../../tracing_core/dispatcher/struct.DefaultGuard.html"title="struct tracing_core::dispatcher::DefaultGuard">DefaultGuard</a></h4></section></summary><divclass='docblock'>Sets <code>self</code> as the <ahref="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">default subscriber</a> in the current scope, returning a
guard that will unset it when dropped. <ahref="../util/trait.SubscriberInitExt.html#method.set_default">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_init"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/util.rs.html#58-74">source</a><ahref="#method.try_init"class="anchor">§</a><h4class="code-header">fn <ahref="../util/trait.SubscriberInitExt.html#method.try_init"class="fn">try_init</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, <aclass="struct"href="../util/struct.TryInitError.html"title="struct tracing_subscriber::util::TryInitError">TryInitError</a>></h4></section></summary><divclass='docblock'>Attempts to set <code>self</code> as the <ahref="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">global default subscriber</a> in the current
scope, returning an error if one is already set. <ahref="../util/trait.SubscriberInitExt.html#method.try_init">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.init"class="method trait-impl"><aclass="src rightside"href="../../src/tracing_subscriber/util.rs.html#89-92">source</a><ahref="#method.init"class="anchor">§</a><h4class="code-header">fn <ahref="../util/trait.SubscriberInitExt.html#method.init"class="fn">init</a>(self)</h4></section></summary><divclass='docblock'>Attempts to set <code>self</code> as the <ahref="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">global default subscriber</a> in the current
scope, panicking if this fails. <ahref="../util/trait.SubscriberInitExt.html#method.init">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-TryFrom%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#805-807">source</a><ahref="#impl-TryFrom%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T<divclass="where">where
U: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Error"class="associatedtype trait-impl"><ahref="#associatedtype.Error"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error"class="associatedtype">Error</a> = <aclass="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><divclass='docblock'>The type returned in the event of a conversion error.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_from"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#812">source</a><ahref="#method.try_from"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#tymethod.try_from"class="fn">try_from</a>(value: U) -><aclass="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 <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="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><divclass='docblock'>Performs the conversion.</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-TryInto%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#790-792">source</a><ahref="#impl-TryInto%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T<divclass="where">where
U: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Error-1"class="associatedtype trait-impl"><ahref="#associatedtype.Error-1"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#associatedtype.Error"class="associatedtype">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="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><divclass='docblock'>The type returned in the event of a conversion error.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_into"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#797">source</a><ahref="#method.try_into"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#tymethod.try_into"class="fn">try_into</a>(self) -><aclass="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 <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="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><divclass='docblock'>Performs the conversion.</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-WithSubscriber-for-T"class="impl"><aclass="src rightside"href="../../src/tracing/instrument.rs.html#393">source</a><ahref="#impl-WithSubscriber-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="../../tracing/instrument/trait.WithSubscriber.html"title="trait tracing::instrument::WithSubscriber">WithSubscriber</a> for T</h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.with_subscriber"class="method trait-impl"><aclass="src rightside"href="../../src/tracing/instrument.rs.html#176-178">source</a><ahref="#method.with_subscriber"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber"class="fn">with_subscriber</a><S>(self, subscriber: S) -><aclass="struct"href="../../tracing/instrument/struct.WithDispatch.html"title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self><divclass="where">where
S: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="struct"href="../../tracing_core/dispatcher/struct.Dispatch.html"title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>>,</div></h4></section></summary><divclass='docblock'>Attaches the provided <ahref="../../tracing_core/subscriber/trait.Subscriber.html"title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
<ahref="../../tracing/instrument/struct.WithDispatch.html"title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <ahref="../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.with_current_subscriber"class="method trait-impl"><aclass="src rightside"href="../../src/tracing/instrument.rs.html#228">source</a><ahref="#method.with_current_subscriber"class="anchor">§</a><h4class="code-header">fn <ahref="../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber"class="fn">with_current_subscriber</a>(self) -><aclass="struct"href="../../tracing/instrument/struct.WithDispatch.html"title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self></h4></section></summary><divclass='docblock'>Attaches the current <ahref="../../tracing/dispatcher/index.html#setting-the-default-subscriber"title="mod tracing::dispatcher">default</a><ahref="../../tracing_core/subscriber/trait.Subscriber.html"title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a