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 </pre><pre class="rust"><code><span class="doccomment">//! Spans represent periods of time in which a program was executing in a
 //! particular context.
 //!
 //! A span consists of [fields], user-defined key-value pairs of arbitrary data
 //! that describe the context the span represents, and a set of fixed attributes
 //! that describe all `tracing` spans and events. Attributes describing spans
 //! include:
 //!
 //! - An [`Id`] assigned by the subscriber that uniquely identifies it in relation
 //!   to other spans.
 //! - The span&#39;s [parent] in the trace tree.
 //! - [Metadata] that describes static characteristics of all spans
 //!   originating from that callsite, such as its name, source code location,
 //!   [verbosity level], and the names of its fields.
 //!
 //! # Creating Spans
 //!
 //! Spans are created using the [`span!`] macro. This macro is invoked with the
 //! following arguments, in order:
 //!
 //! - The [`target`] and/or [`parent`][parent] attributes, if the user wishes to
 //!   override their default values.
 //! - The span&#39;s [verbosity level]
 //! - A string literal providing the span&#39;s name.
 //! - Finally, between zero and 32 arbitrary key/value fields.
 //!
 //! [`target`]: super::Metadata::target
 //!
 //! For example:
 //! ```rust
 //! use tracing::{span, Level};
 //!
 //! /// Construct a new span at the `INFO` level named &quot;my_span&quot;, with a single
 //! /// field named answer , with the value `42`.
 //! let my_span = span!(Level::INFO, &quot;my_span&quot;, answer = 42);
 //! ```
 //!
 //! The documentation for the [`span!`] macro provides additional examples of
 //! the various options that exist when creating spans.
 //!
 //! The [`trace_span!`], [`debug_span!`], [`info_span!`], [`warn_span!`], and
 //! [`error_span!`] exist as shorthand for constructing spans at various
 //! verbosity levels.
 //!
 //! ## Recording Span Creation
 //!
 //! The [`Attributes`] type contains data associated with a span, and is
 //! provided to the [`Subscriber`] when a new span is created. It contains
 //! the span&#39;s metadata, the ID of [the span&#39;s parent][parent] if one was
 //! explicitly set, and any fields whose values were recorded when the span was
 //! constructed. The subscriber, which is responsible for recording `tracing`
 //! data, can then store or record these values.
 //!
 //! # The Span Lifecycle
 //!
 //! ## Entering a Span
 //!
 //! A thread of execution is said to _enter_ a span when it begins executing,
 //! and _exit_ the span when it switches to another context. Spans may be
 //! entered through the [`enter`], [`entered`], and [`in_scope`] methods.
 //!
 //! The [`enter`] method enters a span, returning a [guard] that exits the span
 //! when dropped
 //! ```
 //! # use tracing::{span, Level};
 //! let my_var: u64 = 5;
 //! let my_span = span!(Level::TRACE, &quot;my_span&quot;, my_var);
 //!
 //! // `my_span` exists but has not been entered.
 //!
 //! // Enter `my_span`...
 //! let _enter = my_span.enter();
 //!
 //! // Perform some work inside of the context of `my_span`...
 //! // Dropping the `_enter` guard will exit the span.
 //!```
 //!
 //! &lt;div class=&quot;example-wrap&quot; style=&quot;display:inline-block&quot;&gt;&lt;pre class=&quot;compile_fail&quot; style=&quot;white-space:normal;font:inherit;&quot;&gt;
 //!     &lt;strong&gt;Warning&lt;/strong&gt;: In asynchronous code that uses async/await syntax,
 //!     &lt;code&gt;Span::enter&lt;/code&gt; may produce incorrect traces if the returned drop
 //!     guard is held across an await point. See
 //!     &lt;a href=&quot;struct.Span.html#in-asynchronous-code&quot;&gt;the method documentation&lt;/a&gt;
 //!     for details.
 //! &lt;/pre&gt;&lt;/div&gt;
 //!
 //! The [`entered`] method is analogous to [`enter`], but moves the span into
 //! the returned guard, rather than borrowing it. This allows creating and
 //! entering a span in a single expression:
 //!
 //! ```
 //! # use tracing::{span, Level};
 //! // Create a span and enter it, returning a guard:
 //! let span = span!(Level::INFO, &quot;my_span&quot;).entered();
 //!
 //! // We are now inside the span! Like `enter()`, the guard returned by
 //! // `entered()` will exit the span when it is dropped...
 //!
 //! // ...but, it can also be exited explicitly, returning the `Span`
 //! // struct:
 //! let span = span.exit();
 //! ```
 //!
 //! Finally, [`in_scope`] takes a closure or function pointer and executes it
 //! inside the span:
 //!
 //! ```
 //! # use tracing::{span, Level};
 //! let my_var: u64 = 5;
 //! let my_span = span!(Level::TRACE, &quot;my_span&quot;, my_var = &amp;my_var);
 //!
 //! my_span.in_scope(|| {
 //!     // perform some work in the context of `my_span`...
 //! });
 //!
 //! // Perform some work outside of the context of `my_span`...
 //!
 //! my_span.in_scope(|| {
 //!     // Perform some more work in the context of `my_span`.
 //! });
 //! ```
 //!
 //! &lt;pre class=&quot;ignore&quot; style=&quot;white-space:normal;font:inherit;&quot;&gt;
 //!     &lt;strong&gt;Note&lt;/strong&gt;: Since entering a span takes &lt;code&gt;&amp;self&lt;/code&gt;, and
 //!     &lt;code&gt;Span&lt;/code&gt;s are &lt;code&gt;Clone&lt;/code&gt;, &lt;code&gt;Send&lt;/code&gt;, and
 //!     &lt;code&gt;Sync&lt;/code&gt;, it is entirely valid for multiple threads to enter the
 //!     same span concurrently.
 //! &lt;/pre&gt;
 //!
 //! ## Span Relationships
 //!
 //! Spans form a tree structure — unless it is a root span, all spans have a
 //! _parent_, and may have one or more _children_. When a new span is created,
 //! the current span becomes the new span&#39;s parent. The total execution time of
 //! a span consists of the time spent in that span and in the entire subtree
 //! represented by its children. Thus, a parent span always lasts for at least
 //! as long as the longest-executing span in its subtree.
 //!
 //! ```
 //! # use tracing::{Level, span};
 //! // this span is considered the &quot;root&quot; of a new trace tree:
 //! span!(Level::INFO, &quot;root&quot;).in_scope(|| {
 //!     // since we are now inside &quot;root&quot;, this span is considered a child
 //!     // of &quot;root&quot;:
 //!     span!(Level::DEBUG, &quot;outer_child&quot;).in_scope(|| {
 //!         // this span is a child of &quot;outer_child&quot;, which is in turn a
 //!         // child of &quot;root&quot;:
 //!         span!(Level::TRACE, &quot;inner_child&quot;).in_scope(|| {
 //!             // and so on...
 //!         });
 //!     });
 //!     // another span created here would also be a child of &quot;root&quot;.
 //! });
 //!```
 //!
 //! In addition, the parent of a span may be explicitly specified in
 //! the `span!` macro. For example:
 //!
 //! ```rust
 //! # use tracing::{Level, span};
 //! // Create, but do not enter, a span called &quot;foo&quot;.
 //! let foo = span!(Level::INFO, &quot;foo&quot;);
 //!
 //! // Create and enter a span called &quot;bar&quot;.
 //! let bar = span!(Level::INFO, &quot;bar&quot;);
 //! let _enter = bar.enter();
 //!
 //! // Although we have currently entered &quot;bar&quot;, &quot;baz&quot;&#39;s parent span
 //! // will be &quot;foo&quot;.
 //! let baz = span!(parent: &amp;foo, Level::INFO, &quot;baz&quot;);
 //! ```
 //!
 //! A child span should typically be considered _part_ of its parent. For
 //! example, if a subscriber is recording the length of time spent in various
 //! spans, it should generally include the time spent in a span&#39;s children as
 //! part of that span&#39;s duration.
 //!
 //! In addition to having zero or one parent, a span may also _follow from_ any
 //! number of other spans. This indicates a causal relationship between the span
 //! and the spans that it follows from, but a follower is *not* typically
 //! considered part of the duration of the span it follows. Unlike the parent, a
 //! span may record that it follows from another span after it is created, using
 //! the [`follows_from`] method.
 //!
 //! As an example, consider a listener task in a server. As the listener accepts
 //! incoming connections, it spawns new tasks that handle those connections. We
 //! might want to have a span representing the listener, and instrument each
 //! spawned handler task with its own span. We would want our instrumentation to
 //! record that the handler tasks were spawned as a result of the listener task.
 //! However, we might not consider the handler tasks to be _part_ of the time
 //! spent in the listener task, so we would not consider those spans children of
 //! the listener span. Instead, we would record that the handler tasks follow
 //! from the listener, recording the causal relationship but treating the spans
 //! as separate durations.
 //!
 //! ## Closing Spans
 //!
 //! Execution may enter and exit a span multiple times before that span is
 //! _closed_. Consider, for example, a future which has an associated
 //! span and enters that span every time it is polled:
 //! ```rust
 //! # use std::future::Future;
 //! # use std::task::{Context, Poll};
 //! # use std::pin::Pin;
 //! struct MyFuture {
 //!    // data
 //!    span: tracing::Span,
 //! }
 //!
 //! impl Future for MyFuture {
 //!     type Output = ();
 //!
 //!     fn poll(self: Pin&lt;&amp;mut Self&gt;, _cx: &amp;mut Context&lt;&#39;_&gt;) -&gt; Poll&lt;Self::Output&gt; {
 //!         let _enter = self.span.enter();
 //!         // Do actual future work...
 //! # Poll::Ready(())
 //!     }
 //! }
 //! ```
 //!
 //! If this future was spawned on an executor, it might yield one or more times
 //! before `poll` returns [`Poll::Ready`]. If the future were to yield, then
 //! the executor would move on to poll the next future, which may _also_ enter
 //! an associated span or series of spans. Therefore, it is valid for a span to
 //! be entered repeatedly before it completes. Only the time when that span or
 //! one of its children was the current span is considered to be time spent in
 //! that span. A span which is not executing and has not yet been closed is said
 //! to be _idle_.
 //!
 //! Because spans may be entered and exited multiple times before they close,
 //! [`Subscriber`]s have separate trait methods which are called to notify them
 //! of span exits and when span handles are dropped. When execution exits a
 //! span, [`exit`] will always be called with that span&#39;s ID to notify the
 //! subscriber that the span has been exited. When span handles are dropped, the
 //! [`drop_span`] method is called with that span&#39;s ID. The subscriber may use
 //! this to determine whether or not the span will be entered again.
 //!
 //! If there is only a single handle with the capacity to exit a span, dropping
 //! that handle &quot;closes&quot; the span, since the capacity to enter it no longer
 //! exists. For example:
 //! ```
 //! # use tracing::{Level, span};
 //! {
 //!     span!(Level::TRACE, &quot;my_span&quot;).in_scope(|| {
 //!         // perform some work in the context of `my_span`...
 //!     }); // --&gt; Subscriber::exit(my_span)
 //!
 //!     // The handle to `my_span` only lives inside of this block; when it is
 //!     // dropped, the subscriber will be informed via `drop_span`.
 //!
 //! } // --&gt; Subscriber::drop_span(my_span)
 //! ```
 //!
 //! However, if multiple handles exist, the span can still be re-entered even if
 //! one or more is dropped. For determining when _all_ handles to a span have
 //! been dropped, `Subscriber`s have a [`clone_span`] method, which is called
 //! every time a span handle is cloned. Combined with `drop_span`, this may be
 //! used to track the number of handles to a given span — if `drop_span` has
 //! been called one more time than the number of calls to `clone_span` for a
 //! given ID, then no more handles to the span with that ID exist. The
 //! subscriber may then treat it as closed.
 //!
 //! # When to use spans
 //!
 //! As a rule of thumb, spans should be used to represent discrete units of work
 //! (e.g., a given request&#39;s lifetime in a server) or periods of time spent in a
 //! given context (e.g., time spent interacting with an instance of an external
 //! system, such as a database).
 //!
 //! Which scopes in a program correspond to new spans depend somewhat on user
 //! intent. For example, consider the case of a loop in a program. Should we
 //! construct one span and perform the entire loop inside of that span, like:
 //!
 //! ```rust
 //! # use tracing::{Level, span};
 //! # let n = 1;
 //! let span = span!(Level::TRACE, &quot;my_loop&quot;);
 //! let _enter = span.enter();
 //! for i in 0..n {
 //!     # let _ = i;
 //!     // ...
 //! }
 //! ```
 //! Or, should we create a new span for each iteration of the loop, as in:
 //! ```rust
 //! # use tracing::{Level, span};
 //! # let n = 1u64;
 //! for i in 0..n {
 //!     let span = span!(Level::TRACE, &quot;my_loop&quot;, iteration = i);
 //!     let _enter = span.enter();
 //!     // ...
 //! }
 //! ```
 //!
 //! Depending on the circumstances, we might want to do either, or both. For
 //! example, if we want to know how long was spent in the loop overall, we would
 //! create a single span around the entire loop; whereas if we wanted to know how
 //! much time was spent in each individual iteration, we would enter a new span
 //! on every iteration.
 //!
 //! [fields]: super::field
 //! [Metadata]: super::Metadata
 //! [verbosity level]: super::Level
 //! [`Poll::Ready`]: std::task::Poll::Ready
 //! [`span!`]: super::span!
 //! [`trace_span!`]: super::trace_span!
 //! [`debug_span!`]: super::debug_span!
 //! [`info_span!`]: super::info_span!
 //! [`warn_span!`]: super::warn_span!
 //! [`error_span!`]: super::error_span!
 //! [`clone_span`]: super::subscriber::Subscriber::clone_span()
 //! [`drop_span`]: super::subscriber::Subscriber::drop_span()
 //! [`exit`]: super::subscriber::Subscriber::exit
 //! [`Subscriber`]: super::subscriber::Subscriber
 //! [`enter`]: Span::enter()
 //! [`entered`]: Span::entered()
 //! [`in_scope`]: Span::in_scope()
 //! [`follows_from`]: Span::follows_from()
 //! [guard]: Entered
 //! [parent]: #span-relationships
 </span><span class="kw">pub use </span>tracing_core::span::{Attributes, Id, Record};

 <span class="kw">use </span><span class="kw">crate</span>::stdlib::{
     cmp, fmt,
     hash::{Hash, Hasher},
     marker::PhantomData,
     mem,
     ops::Deref,
 };
 <span class="kw">use crate</span>::{
     dispatcher::{<span class="self">self</span>, Dispatch},
     field, Metadata,
 };

 <span class="doccomment">/// Trait implemented by types which have a span `Id`.
 </span><span class="kw">pub trait </span>AsId: <span class="kw">crate</span>::sealed::Sealed {
     <span class="doccomment">/// Returns the `Id` of the span that `self` corresponds to, or `None` if
     /// this corresponds to a disabled span.
     </span><span class="kw">fn </span>as_id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Id&gt;;
 }

 <span class="doccomment">/// A handle representing a span, with the capability to enter the span if it
 /// exists.
 ///
 /// If the span was rejected by the current `Subscriber`&#39;s filter, entering the
 /// span will silently do nothing. Thus, the handle can be used in the same
 /// manner regardless of whether or not the trace is currently being collected.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>Span {
     <span class="doccomment">/// A handle used to enter the span when it is not executing.
     ///
     /// If this is `None`, then the span has either closed or was never enabled.
     </span>inner: <span class="prelude-ty">Option</span>&lt;Inner&gt;,
     <span class="doccomment">/// Metadata describing the span.
     ///
     /// This might be `Some` even if `inner` is `None`, in the case that the
     /// span is disabled but the metadata is needed for `log` support.
     </span>meta: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;&gt;,
 }

 <span class="doccomment">/// A handle representing the capacity to enter a span which is known to exist.
 ///
 /// Unlike `Span`, this type is only constructed for spans which _have_ been
 /// enabled by the current filter. This type is primarily used for implementing
 /// span handles; users should typically not need to interact with it directly.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Inner {
     <span class="doccomment">/// The span&#39;s ID, as provided by `subscriber`.
     </span>id: Id,

     <span class="doccomment">/// The subscriber that will receive events relating to this span.
     ///
     /// This should be the same subscriber that provided this span with its
     /// `id`.
     </span>subscriber: Dispatch,
 }

 <span class="doccomment">/// A guard representing a span which has been entered and is currently
 /// executing.
 ///
 /// When the guard is dropped, the span will be exited.
 ///
 /// This is returned by the [`Span::enter`] function.
 ///
 /// [`Span::enter`]: super::Span::enter
 </span><span class="attribute">#[derive(Debug)]
 #[must_use = <span class="string">&quot;once a span has been entered, it should be exited&quot;</span>]
 </span><span class="kw">pub struct </span>Entered&lt;<span class="lifetime">&#39;a</span>&gt; {
     span: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Span,
 }

 <span class="doccomment">/// An owned version of [`Entered`], a guard representing a span which has been
 /// entered and is currently executing.
 ///
 /// When the guard is dropped, the span will be exited.
 ///
 /// This is returned by the [`Span::entered`] function.
 ///
 /// [`Span::entered`]: super::Span::entered()
 </span><span class="attribute">#[derive(Debug)]
 #[must_use = <span class="string">&quot;once a span has been entered, it should be exited&quot;</span>]
 </span><span class="kw">pub struct </span>EnteredSpan {
     span: Span,

     <span class="doccomment">/// ```compile_fail
     /// use tracing::span::*;
     /// trait AssertSend: Send {}
     ///
     /// impl AssertSend for EnteredSpan {}
     /// ```
     </span>_not_send: PhantomNotSend,
 }

 <span class="doccomment">/// `log` target for all span lifecycle (creation/enter/exit/close) records.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;log&quot;</span>)]
 </span><span class="kw">const </span>LIFECYCLE_LOG_TARGET: <span class="kw-2">&amp;</span>str = <span class="string">&quot;tracing::span&quot;</span>;
 <span class="doccomment">/// `log` target for span activity (enter/exit) records.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;log&quot;</span>)]
 </span><span class="kw">const </span>ACTIVITY_LOG_TARGET: <span class="kw-2">&amp;</span>str = <span class="string">&quot;tracing::span::active&quot;</span>;

 <span class="comment">// ===== impl Span =====

 </span><span class="kw">impl </span>Span {
     <span class="doccomment">/// Constructs a new `Span` with the given [metadata] and set of
     /// [field values].
     ///
     /// The new span will be constructed by the currently-active [`Subscriber`],
     /// with the current span as its parent (if one exists).
     ///
     /// After the span is constructed, [field values] and/or [`follows_from`]
     /// annotations may be added to it.
     ///
     /// [metadata]: super::Metadata
     /// [`Subscriber`]: super::subscriber::Subscriber
     /// [field values]: super::field::ValueSet
     /// [`follows_from`]: super::Span::follows_from
     </span><span class="kw">pub fn </span>new(meta: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;, values: <span class="kw-2">&amp;</span>field::ValueSet&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Span {
         dispatcher::get_default(|dispatch| <span class="self">Self</span>::new_with(meta, values, dispatch))
     }

     <span class="attribute">#[inline]
     #[doc(hidden)]
     </span><span class="kw">pub fn </span>new_with(
         meta: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;,
         values: <span class="kw-2">&amp;</span>field::ValueSet&lt;<span class="lifetime">&#39;_</span>&gt;,
         dispatch: <span class="kw-2">&amp;</span>Dispatch,
     ) -&gt; Span {
         <span class="kw">let </span>new_span = Attributes::new(meta, values);
         <span class="self">Self</span>::make_with(meta, new_span, dispatch)
     }

     <span class="doccomment">/// Constructs a new `Span` as the root of its own trace tree, with the
     /// given [metadata] and set of [field values].
     ///
     /// After the span is constructed, [field values] and/or [`follows_from`]
     /// annotations may be added to it.
     ///
     /// [metadata]: super::Metadata
     /// [field values]: super::field::ValueSet
     /// [`follows_from`]: super::Span::follows_from
     </span><span class="kw">pub fn </span>new_root(meta: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;, values: <span class="kw-2">&amp;</span>field::ValueSet&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Span {
         dispatcher::get_default(|dispatch| <span class="self">Self</span>::new_root_with(meta, values, dispatch))
     }

     <span class="attribute">#[inline]
     #[doc(hidden)]
     </span><span class="kw">pub fn </span>new_root_with(
         meta: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;,
         values: <span class="kw-2">&amp;</span>field::ValueSet&lt;<span class="lifetime">&#39;_</span>&gt;,
         dispatch: <span class="kw-2">&amp;</span>Dispatch,
     ) -&gt; Span {
         <span class="kw">let </span>new_span = Attributes::new_root(meta, values);
         <span class="self">Self</span>::make_with(meta, new_span, dispatch)
     }

     <span class="doccomment">/// Constructs a new `Span` as child of the given parent span, with the
     /// given [metadata] and set of [field values].
     ///
     /// After the span is constructed, [field values] and/or [`follows_from`]
     /// annotations may be added to it.
     ///
     /// [metadata]: super::Metadata
     /// [field values]: super::field::ValueSet
     /// [`follows_from`]: super::Span::follows_from
     </span><span class="kw">pub fn </span>child_of(
         parent: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;Id&gt;&gt;,
         meta: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;,
         values: <span class="kw-2">&amp;</span>field::ValueSet&lt;<span class="lifetime">&#39;_</span>&gt;,
     ) -&gt; Span {
         <span class="kw">let </span><span class="kw-2">mut </span>parent = parent.into();
         dispatcher::get_default(<span class="kw">move </span>|dispatch| {
             <span class="self">Self</span>::child_of_with(Option::take(<span class="kw-2">&amp;mut </span>parent), meta, values, dispatch)
         })
     }

     <span class="attribute">#[inline]
     #[doc(hidden)]
     </span><span class="kw">pub fn </span>child_of_with(
         parent: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;Id&gt;&gt;,
         meta: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;,
         values: <span class="kw-2">&amp;</span>field::ValueSet&lt;<span class="lifetime">&#39;_</span>&gt;,
         dispatch: <span class="kw-2">&amp;</span>Dispatch,
     ) -&gt; Span {
         <span class="kw">let </span>new_span = <span class="kw">match </span>parent.into() {
             <span class="prelude-val">Some</span>(parent) =&gt; Attributes::child_of(parent, meta, values),
             <span class="prelude-val">None </span>=&gt; Attributes::new_root(meta, values),
         };
         <span class="self">Self</span>::make_with(meta, new_span, dispatch)
     }

     <span class="doccomment">/// Constructs a new disabled span with the given `Metadata`.
     ///
     /// This should be used when a span is constructed from a known callsite,
     /// but the subscriber indicates that it is disabled.
     ///
     /// Entering, exiting, and recording values on this span will not notify the
     /// `Subscriber` but _may_ record log messages if the `log` feature flag is
     /// enabled.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>new_disabled(meta: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;) -&gt; Span {
         <span class="self">Self </span>{
             inner: <span class="prelude-val">None</span>,
             meta: <span class="prelude-val">Some</span>(meta),
         }
     }

     <span class="doccomment">/// Constructs a new span that is *completely disabled*.
     ///
     /// This can be used rather than `Option&lt;Span&gt;` to represent cases where a
     /// span is not present.
     ///
     /// Entering, exiting, and recording values on this span will do nothing.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub const fn </span>none() -&gt; Span {
         <span class="self">Self </span>{
             inner: <span class="prelude-val">None</span>,
             meta: <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Returns a handle to the span [considered by the `Subscriber`] to be the
     /// current span.
     ///
     /// If the subscriber indicates that it does not track the current span, or
     /// that the thread from which this function is called is not currently
     /// inside a span, the returned span will be disabled.
     ///
     /// [considered by the `Subscriber`]:
     ///     super::subscriber::Subscriber::current_span
     </span><span class="kw">pub fn </span>current() -&gt; Span {
         dispatcher::get_default(|dispatch| {
             <span class="kw">if let </span><span class="prelude-val">Some</span>((id, meta)) = dispatch.current_span().into_inner() {
                 <span class="kw">let </span>id = dispatch.clone_span(<span class="kw-2">&amp;</span>id);
                 <span class="self">Self </span>{
                     inner: <span class="prelude-val">Some</span>(Inner::new(id, dispatch)),
                     meta: <span class="prelude-val">Some</span>(meta),
                 }
             } <span class="kw">else </span>{
                 <span class="self">Self</span>::none()
             }
         })
     }

     <span class="kw">fn </span>make_with(
         meta: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;,
         new_span: Attributes&lt;<span class="lifetime">&#39;_</span>&gt;,
         dispatch: <span class="kw-2">&amp;</span>Dispatch,
     ) -&gt; Span {
         <span class="kw">let </span>attrs = <span class="kw-2">&amp;</span>new_span;
         <span class="kw">let </span>id = dispatch.new_span(attrs);
         <span class="kw">let </span>inner = <span class="prelude-val">Some</span>(Inner::new(id, dispatch));

         <span class="kw">let </span>span = <span class="self">Self </span>{
             inner,
             meta: <span class="prelude-val">Some</span>(meta),
         };

         <span class="macro">if_log_enabled! </span>{ <span class="kw-2">*</span>meta.level(), {
             <span class="kw">let </span>target = <span class="kw">if </span>attrs.is_empty() {
                 LIFECYCLE_LOG_TARGET
             } <span class="kw">else </span>{
                 meta.target()
             };
             <span class="kw">let </span>values = attrs.values();
             span.log(
                 target,
                 <span class="macro">level_to_log!</span>(<span class="kw-2">*</span>meta.level()),
                 <span class="macro">format_args!</span>(<span class="string">&quot;++ {};{}&quot;</span>, meta.name(), <span class="kw">crate</span>::log::LogValueSet { values, is_first: <span class="bool-val">false </span>}),
             );
         }}

         span
     }

     <span class="doccomment">/// Enters this span, returning a guard that will exit the span when dropped.
     ///
     /// If this span is enabled by the current subscriber, then this function will
     /// call [`Subscriber::enter`] with the span&#39;s [`Id`], and dropping the guard
     /// will call [`Subscriber::exit`]. If the span is disabled, this does
     /// nothing.
     ///
     /// # In Asynchronous Code
     ///
     /// **Warning**: in asynchronous code that uses [async/await syntax][syntax],
     /// `Span::enter` should be used very carefully or avoided entirely. Holding
     /// the drop guard returned by `Span::enter` across `.await` points will
     /// result in incorrect traces. For example,
     ///
     /// ```
     /// # use tracing::info_span;
     /// # async fn some_other_async_function() {}
     /// async fn my_async_function() {
     ///     let span = info_span!(&quot;my_async_function&quot;);
     ///
     ///     // WARNING: This span will remain entered until this
     ///     // guard is dropped...
     ///     let _enter = span.enter();
     ///     // ...but the `await` keyword may yield, causing the
     ///     // runtime to switch to another task, while remaining in
     ///     // this span!
     ///     some_other_async_function().await
     ///
     ///     // ...
     /// }
     /// ```
     ///
     /// The drop guard returned by `Span::enter` exits the span when it is
     /// dropped. When an async function or async block yields at an `.await`
     /// point, the current scope is _exited_, but values in that scope are
     /// **not** dropped (because the async block will eventually resume
     /// execution from that await point). This means that _another_ task will
     /// begin executing while _remaining_ in the entered span. This results in
     /// an incorrect trace.
     ///
     /// Instead of using `Span::enter` in asynchronous code, prefer the
     /// following:
     ///
     /// * To enter a span for a synchronous section of code within an async
     ///   block or function, prefer [`Span::in_scope`]. Since `in_scope` takes a
     ///   synchronous closure and exits the span when the closure returns, the
     ///   span will always be exited before the next await point. For example:
     ///   ```
     ///   # use tracing::info_span;
     ///   # async fn some_other_async_function(_: ()) {}
     ///   async fn my_async_function() {
     ///       let span = info_span!(&quot;my_async_function&quot;);
     ///
     ///       let some_value = span.in_scope(|| {
     ///           // run some synchronous code inside the span...
     ///       });
     ///
     ///       // This is okay! The span has already been exited before we reach
     ///       // the await point.
     ///       some_other_async_function(some_value).await;
     ///
     ///       // ...
     ///   }
     ///   ```
     /// * For instrumenting asynchronous code, `tracing` provides the
     ///   [`Future::instrument` combinator][instrument] for
     ///   attaching a span to a future (async function or block). This will
     ///   enter the span _every_ time the future is polled, and exit it whenever
     ///   the future yields.
     ///
     ///   `Instrument` can be used with an async block inside an async function:
     ///   ```ignore
     ///   # use tracing::info_span;
     ///   use tracing::Instrument;
     ///
     ///   # async fn some_other_async_function() {}
     ///   async fn my_async_function() {
     ///       let span = info_span!(&quot;my_async_function&quot;);
     ///       async move {
     ///          // This is correct! If we yield here, the span will be exited,
     ///          // and re-entered when we resume.
     ///          some_other_async_function().await;
     ///
     ///          //more asynchronous code inside the span...
     ///
     ///       }
     ///         // instrument the async block with the span...
     ///         .instrument(span)
     ///         // ...and await it.
     ///         .await
     ///   }
     ///   ```
     ///
     ///   It can also be used to instrument calls to async functions at the
     ///   callsite:
     ///   ```ignore
     ///   # use tracing::debug_span;
     ///   use tracing::Instrument;
     ///
     ///   # async fn some_other_async_function() {}
     ///   async fn my_async_function() {
     ///       let some_value = some_other_async_function()
     ///          .instrument(debug_span!(&quot;some_other_async_function&quot;))
     ///          .await;
     ///
     ///       // ...
     ///   }
     ///   ```
     ///
     /// * The [`#[instrument]` attribute macro][attr] can automatically generate
     ///   correct code when used on an async function:
     ///
     ///   ```ignore
     ///   # async fn some_other_async_function() {}
     ///   #[tracing::instrument(level = &quot;info&quot;)]
     ///   async fn my_async_function() {
     ///
     ///       // This is correct! If we yield here, the span will be exited,
     ///       // and re-entered when we resume.
     ///       some_other_async_function().await;
     ///
     ///       // ...
     ///
     ///   }
     ///   ```
     ///
     /// [syntax]: https://rust-lang.github.io/async-book/01_getting_started/04_async_await_primer.html
     /// [`Span::in_scope`]: Span::in_scope()
     /// [instrument]: crate::Instrument
     /// [attr]: macro@crate::instrument
     ///
     /// # Examples
     ///
     /// ```
     /// # use tracing::{span, Level};
     /// let span = span!(Level::INFO, &quot;my_span&quot;);
     /// let guard = span.enter();
     ///
     /// // code here is within the span
     ///
     /// drop(guard);
     ///
     /// // code here is no longer within the span
     ///
     /// ```
     ///
     /// Guards need not be explicitly dropped:
     ///
     /// ```
     /// # use tracing::trace_span;
     /// fn my_function() -&gt; String {
     ///     // enter a span for the duration of this function.
     ///     let span = trace_span!(&quot;my_function&quot;);
     ///     let _enter = span.enter();
     ///
     ///     // anything happening in functions we call is still inside the span...
     ///     my_other_function();
     ///
     ///     // returning from the function drops the guard, exiting the span.
     ///     return &quot;Hello world&quot;.to_owned();
     /// }
     ///
     /// fn my_other_function() {
     ///     // ...
     /// }
     /// ```
     ///
     /// Sub-scopes may be created to limit the duration for which the span is
     /// entered:
     ///
     /// ```
     /// # use tracing::{info, info_span};
     /// let span = info_span!(&quot;my_great_span&quot;);
     ///
     /// {
     ///     let _enter = span.enter();
     ///
     ///     // this event occurs inside the span.
     ///     info!(&quot;i&#39;m in the span!&quot;);
     ///
     ///     // exiting the scope drops the guard, exiting the span.
     /// }
     ///
     /// // this event is not inside the span.
     /// info!(&quot;i&#39;m outside the span!&quot;)
     /// ```
     ///
     /// [`Subscriber::enter`]: super::subscriber::Subscriber::enter()
     /// [`Subscriber::exit`]: super::subscriber::Subscriber::exit()
     /// [`Id`]: super::Id
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>enter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Entered&lt;<span class="lifetime">&#39;_</span>&gt; {
         <span class="self">self</span>.do_enter();
         Entered { span: <span class="self">self </span>}
     }

     <span class="doccomment">/// Enters this span, consuming it and returning a [guard][`EnteredSpan`]
     /// that will exit the span when dropped.
     ///
     /// &lt;pre class=&quot;compile_fail&quot; style=&quot;white-space:normal;font:inherit;&quot;&gt;
     ///     &lt;strong&gt;Warning&lt;/strong&gt;: In asynchronous code that uses async/await syntax,
     ///     &lt;code&gt;Span::entered&lt;/code&gt; may produce incorrect traces if the returned drop
     ///     guard is held across an await point. See &lt;a href=&quot;#in-asynchronous-code&quot;&gt;the
     ///     &lt;code&gt;Span::enter&lt;/code&gt; documentation&lt;/a&gt; for details.
     /// &lt;/pre&gt;
     ///
     ///
     /// If this span is enabled by the current subscriber, then this function will
     /// call [`Subscriber::enter`] with the span&#39;s [`Id`], and dropping the guard
     /// will call [`Subscriber::exit`]. If the span is disabled, this does
     /// nothing.
     ///
     /// This is similar to the [`Span::enter`] method, except that it moves the
     /// span by value into the returned guard, rather than borrowing it.
     /// Therefore, this method can be used to create and enter a span in a
     /// single expression, without requiring a `let`-binding. For example:
     ///
     /// ```
     /// # use tracing::info_span;
     /// let _span = info_span!(&quot;something_interesting&quot;).entered();
     /// ```
     /// rather than:
     /// ```
     /// # use tracing::info_span;
     /// let span = info_span!(&quot;something_interesting&quot;);
     /// let _e = span.enter();
     /// ```
     ///
     /// Furthermore, `entered` may be used when the span must be stored in some
     /// other struct or be passed to a function while remaining entered.
     ///
     /// &lt;pre class=&quot;ignore&quot; style=&quot;white-space:normal;font:inherit;&quot;&gt;
     ///     &lt;strong&gt;Note&lt;/strong&gt;: The returned &lt;a href=&quot;../struct.EnteredSpan.html&quot;&gt;
     ///     &lt;code&gt;EnteredSpan&lt;/a&gt;&lt;/code&gt; guard does not implement &lt;code&gt;Send&lt;/code&gt;.
     ///     Dropping the guard will exit &lt;em&gt;this&lt;/em&gt; span, and if the guard is sent
     ///     to another thread and dropped there, that thread may never have entered
     ///     this span. Thus, &lt;code&gt;EnteredSpan&lt;/code&gt;s should not be sent between threads.
     /// &lt;/pre&gt;
     ///
     /// [syntax]: https://rust-lang.github.io/async-book/01_getting_started/04_async_await_primer.html
     ///
     /// # Examples
     ///
     /// The returned guard can be [explicitly exited][EnteredSpan::exit],
     /// returning the un-entered span:
     ///
     /// ```
     /// # use tracing::{Level, span};
     /// let span = span!(Level::INFO, &quot;doing_something&quot;).entered();
     ///
     /// // code here is within the span
     ///
     /// // explicitly exit the span, returning it
     /// let span = span.exit();
     ///
     /// // code here is no longer within the span
     ///
     /// // enter the span again
     /// let span = span.entered();
     ///
     /// // now we are inside the span once again
     /// ```
     ///
     /// Guards need not be explicitly dropped:
     ///
     /// ```
     /// # use tracing::trace_span;
     /// fn my_function() -&gt; String {
     ///     // enter a span for the duration of this function.
     ///     let span = trace_span!(&quot;my_function&quot;).entered();
     ///
     ///     // anything happening in functions we call is still inside the span...
     ///     my_other_function();
     ///
     ///     // returning from the function drops the guard, exiting the span.
     ///     return &quot;Hello world&quot;.to_owned();
     /// }
     ///
     /// fn my_other_function() {
     ///     // ...
     /// }
     /// ```
     ///
     /// Since the [`EnteredSpan`] guard can dereference to the [`Span`] itself,
     /// the span may still be accessed while entered. For example:
     ///
     /// ```rust
     /// # use tracing::info_span;
     /// use tracing::field;
     ///
     /// // create the span with an empty field, and enter it.
     /// let span = info_span!(&quot;my_span&quot;, some_field = field::Empty).entered();
     ///
     /// // we can still record a value for the field while the span is entered.
     /// span.record(&quot;some_field&quot;, &amp;&quot;hello world!&quot;);
     /// ```
     ///

     /// [`Subscriber::enter`]: super::subscriber::Subscriber::enter()
     /// [`Subscriber::exit`]: super::subscriber::Subscriber::exit()
     /// [`Id`]: super::Id
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>entered(<span class="self">self</span>) -&gt; EnteredSpan {
         <span class="self">self</span>.do_enter();
         EnteredSpan {
             span: <span class="self">self</span>,
             _not_send: PhantomNotSend,
         }
     }

     <span class="doccomment">/// Returns this span, if it was [enabled] by the current [`Subscriber`], or
     /// the [current span] (whose lexical distance may be further than expected),
     ///  if this span [is disabled].
     ///
     /// This method can be useful when propagating spans to spawned threads or
     /// [async tasks]. Consider the following:
     ///
     /// ```
     /// let _parent_span = tracing::info_span!(&quot;parent&quot;).entered();
     ///
     /// // ...
     ///
     /// let child_span = tracing::debug_span!(&quot;child&quot;);
     ///
     /// std::thread::spawn(move || {
     ///     let _entered = child_span.entered();
     ///
     ///     tracing::info!(&quot;spawned a thread!&quot;);
     ///
     ///     // ...
     /// });
     /// ```
     ///
     /// If the current [`Subscriber`] enables the [`DEBUG`] level, then both
     /// the &quot;parent&quot; and &quot;child&quot; spans will be enabled. Thus, when the &quot;spawaned
     /// a thread!&quot; event occurs, it will be inside of the &quot;child&quot; span. Because
     /// &quot;parent&quot; is the parent of &quot;child&quot;, the event will _also_ be inside of
     /// &quot;parent&quot;.
     ///
     /// However, if the [`Subscriber`] only enables the [`INFO`] level, the &quot;child&quot;
     /// span will be disabled. When the thread is spawned, the
     /// `child_span.entered()` call will do nothing, since &quot;child&quot; is not
     /// enabled. In this case, the &quot;spawned a thread!&quot; event occurs outside of
     /// *any* span, since the &quot;child&quot; span was responsible for propagating its
     /// parent to the spawned thread.
     ///
     /// If this is not the desired behavior, `Span::or_current` can be used to
     /// ensure that the &quot;parent&quot; span is propagated in both cases, either as a
     /// parent of &quot;child&quot; _or_ directly. For example:
     ///
     /// ```
     /// let _parent_span = tracing::info_span!(&quot;parent&quot;).entered();
     ///
     /// // ...
     ///
     /// // If DEBUG is enabled, then &quot;child&quot; will be enabled, and `or_current`
     /// // returns &quot;child&quot;. Otherwise, if DEBUG is not enabled, &quot;child&quot; will be
     /// // disabled, and `or_current` returns &quot;parent&quot;.
     /// let child_span = tracing::debug_span!(&quot;child&quot;).or_current();
     ///
     /// std::thread::spawn(move || {
     ///     let _entered = child_span.entered();
     ///
     ///     tracing::info!(&quot;spawned a thread!&quot;);
     ///
     ///     // ...
     /// });
     /// ```
     ///
     /// When spawning [asynchronous tasks][async tasks], `Span::or_current` can
     /// be used similarly, in combination with [`instrument`]:
     ///
     /// ```
     /// use tracing::Instrument;
     /// # // lol
     /// # mod tokio {
     /// #     pub(super) fn spawn(_: impl std::future::Future) {}
     /// # }
     ///
     /// let _parent_span = tracing::info_span!(&quot;parent&quot;).entered();
     ///
     /// // ...
     ///
     /// let child_span = tracing::debug_span!(&quot;child&quot;);
     ///
     /// tokio::spawn(
     ///     async {
     ///         tracing::info!(&quot;spawned a task!&quot;);
     ///
     ///         // ...
     ///
     ///     }.instrument(child_span.or_current())
     /// );
     /// ```
     ///
     /// In general, `or_current` should be preferred over nesting an
     /// [`instrument`]  call inside of an [`in_current_span`] call, as using
     /// `or_current` will be more efficient.
     ///
     /// ```
     /// use tracing::Instrument;
     /// # // lol
     /// # mod tokio {
     /// #     pub(super) fn spawn(_: impl std::future::Future) {}
     /// # }
     /// async fn my_async_fn() {
     ///     // ...
     /// }
     ///
     /// let _parent_span = tracing::info_span!(&quot;parent&quot;).entered();
     ///
     /// // Do this:
     /// tokio::spawn(
     ///     my_async_fn().instrument(tracing::debug_span!(&quot;child&quot;).or_current())
     /// );
     ///
     /// // ...rather than this:
     /// tokio::spawn(
     ///     my_async_fn()
     ///         .instrument(tracing::debug_span!(&quot;child&quot;))
     ///         .in_current_span()
     /// );
     /// ```
     ///
     /// [enabled]: crate::Subscriber::enabled
     /// [`Subscriber`]: crate::Subscriber
     /// [current span]: Span::current
     /// [is disabled]: Span::is_disabled
     /// [`INFO`]: crate::Level::INFO
     /// [`DEBUG`]: crate::Level::DEBUG
     /// [async tasks]: std::task
     /// [`instrument`]: crate::instrument::Instrument::instrument
     /// [`in_current_span`]: crate::instrument::Instrument::in_current_span
     </span><span class="kw">pub fn </span>or_current(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="kw">if </span><span class="self">self</span>.is_disabled() {
             <span class="kw">return </span><span class="self">Self</span>::current();
         }
         <span class="self">self
     </span>}

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>do_enter(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.as_ref() {
             inner.subscriber.enter(<span class="kw-2">&amp;</span>inner.id);
         }

         <span class="macro">if_log_enabled! </span>{ <span class="kw">crate</span>::Level::TRACE, {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(_meta) = <span class="self">self</span>.meta {
                 <span class="self">self</span>.log(ACTIVITY_LOG_TARGET, log::Level::Trace, <span class="macro">format_args!</span>(<span class="string">&quot;-&gt; {};&quot;</span>, _meta.name()));
             }
         }}
     }

     <span class="comment">// Called from [`Entered`] and [`EnteredSpan`] drops.
     //
     // Running this behaviour on drop rather than with an explicit function
     // call means that spans may still be exited when unwinding.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>do_exit(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.as_ref() {
             inner.subscriber.exit(<span class="kw-2">&amp;</span>inner.id);
         }

         <span class="macro">if_log_enabled! </span>{ <span class="kw">crate</span>::Level::TRACE, {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(_meta) = <span class="self">self</span>.meta {
                 <span class="self">self</span>.log(ACTIVITY_LOG_TARGET, log::Level::Trace, <span class="macro">format_args!</span>(<span class="string">&quot;&lt;- {};&quot;</span>, _meta.name()));
             }
         }}
     }

     <span class="doccomment">/// Executes the given function in the context of this span.
     ///
     /// If this span is enabled, then this function enters the span, invokes `f`
     /// and then exits the span. If the span is disabled, `f` will still be
     /// invoked, but in the context of the currently-executing span (if there is
     /// one).
     ///
     /// Returns the result of evaluating `f`.
     ///
     /// # Examples
     ///
     /// ```
     /// # use tracing::{trace, span, Level};
     /// let my_span = span!(Level::TRACE, &quot;my_span&quot;);
     ///
     /// my_span.in_scope(|| {
     ///     // this event occurs within the span.
     ///     trace!(&quot;i&#39;m in the span!&quot;);
     /// });
     ///
     /// // this event occurs outside the span.
     /// trace!(&quot;i&#39;m not in the span!&quot;);
     /// ```
     ///
     /// Calling a function and returning the result:
     /// ```
     /// # use tracing::{info_span, Level};
     /// fn hello_world() -&gt; String {
     ///     &quot;Hello world!&quot;.to_owned()
     /// }
     ///
     /// let span = info_span!(&quot;hello_world&quot;);
     /// // the span will be entered for the duration of the call to
     /// // `hello_world`.
     /// let a_string = span.in_scope(hello_world);
     ///
     </span><span class="kw">pub fn </span>in_scope&lt;F: FnOnce() -&gt; T, T&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, f: F) -&gt; T {
         <span class="kw">let </span>_enter = <span class="self">self</span>.enter();
         f()
     }

     <span class="doccomment">/// Returns a [`Field`][super::field::Field] for the field with the
     /// given `name`, if one exists,
     </span><span class="kw">pub fn </span>field&lt;Q: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, field: <span class="kw-2">&amp;</span>Q) -&gt; <span class="prelude-ty">Option</span>&lt;field::Field&gt;
     <span class="kw">where
         </span>Q: field::AsField,
     {
         <span class="self">self</span>.metadata().and_then(|meta| field.as_field(meta))
     }

     <span class="doccomment">/// Returns true if this `Span` has a field for the given
     /// [`Field`][super::field::Field] or field name.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>has_field&lt;Q: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, field: <span class="kw-2">&amp;</span>Q) -&gt; bool
     <span class="kw">where
         </span>Q: field::AsField,
     {
         <span class="self">self</span>.field(field).is_some()
     }

     <span class="doccomment">/// Records that the field described by `field` has the value `value`.
     ///
     /// This may be used with [`field::Empty`] to declare fields whose values
     /// are not known when the span is created, and record them later:
     /// ```
     /// use tracing::{trace_span, field};
     ///
     /// // Create a span with two fields: `greeting`, with the value &quot;hello world&quot;, and
     /// // `parting`, without a value.
     /// let span = trace_span!(&quot;my_span&quot;, greeting = &quot;hello world&quot;, parting = field::Empty);
     ///
     /// // ...
     ///
     /// // Now, record a value for parting as well.
     /// // (note that the field name is passed as a string slice)
     /// span.record(&quot;parting&quot;, &quot;goodbye world!&quot;);
     /// ```
     /// However, it may also be used to record a _new_ value for a field whose
     /// value was already recorded:
     /// ```
     /// use tracing::info_span;
     /// # fn do_something() -&gt; Result&lt;(), ()&gt; { Err(()) }
     ///
     /// // Initially, let&#39;s assume that our attempt to do something is going okay...
     /// let span = info_span!(&quot;doing_something&quot;, is_okay = true);
     /// let _e = span.enter();
     ///
     /// match do_something() {
     ///     Ok(something) =&gt; {
     ///         // ...
     ///     }
     ///     Err(_) =&gt; {
     ///         // Things are no longer okay!
     ///         span.record(&quot;is_okay&quot;, false);
     ///     }
     /// }
     /// ```
     ///
     /// &lt;pre class=&quot;ignore&quot; style=&quot;white-space:normal;font:inherit;&quot;&gt;
     ///     &lt;strong&gt;Note&lt;/strong&gt;: The fields associated with a span are part
     ///     of its &lt;a href=&quot;../struct.Metadata.html&quot;&gt;&lt;code&gt;Metadata&lt;/code&gt;&lt;/a&gt;.
     ///     The &lt;a href=&quot;../struct.Metadata.html&quot;&gt;&lt;code&gt;Metadata&lt;/code&gt;&lt;/a&gt;
     ///     describing a particular span is constructed statically when the span
     ///     is created and cannot be extended later to add new fields. Therefore,
     ///     you cannot record a value for a field that was not specified when the
     ///     span was created:
     /// &lt;/pre&gt;
     ///
     /// ```
     /// use tracing::{trace_span, field};
     ///
     /// // Create a span with two fields: `greeting`, with the value &quot;hello world&quot;, and
     /// // `parting`, without a value.
     /// let span = trace_span!(&quot;my_span&quot;, greeting = &quot;hello world&quot;, parting = field::Empty);
     ///
     /// // ...
     ///
     /// // Now, you try to record a value for a new field, `new_field`, which was not
     /// // declared as `Empty` or populated when you created `span`.
     /// // You won&#39;t get any error, but the assignment will have no effect!
     /// span.record(&quot;new_field&quot;, &quot;interesting_value_you_really_need&quot;);
     ///
     /// // Instead, all fields that may be recorded after span creation should be declared up front,
     /// // using field::Empty when a value is not known, as we did for `parting`.
     /// // This `record` call will indeed replace field::Empty with &quot;you will be remembered&quot;.
     /// span.record(&quot;parting&quot;, &quot;you will be remembered&quot;);
     /// ```
     ///
     /// [`field::Empty`]: super::field::Empty
     /// [`Metadata`]: super::Metadata
     </span><span class="kw">pub fn </span>record&lt;Q: <span class="question-mark">?</span>Sized, V&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, field: <span class="kw-2">&amp;</span>Q, value: V) -&gt; <span class="kw-2">&amp;</span><span class="self">Self
     </span><span class="kw">where
         </span>Q: field::AsField,
         V: field::Value,
     {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(meta) = <span class="self">self</span>.meta {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(field) = field.as_field(meta) {
                 <span class="self">self</span>.record_all(
                     <span class="kw-2">&amp;</span>meta
                         .fields()
                         .value_set(<span class="kw-2">&amp;</span>[(<span class="kw-2">&amp;</span>field, <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>value <span class="kw">as </span><span class="kw-2">&amp;</span><span class="kw">dyn </span>field::Value))]),
                 );
             }
         }

         <span class="self">self
     </span>}

     <span class="doccomment">/// Records all the fields in the provided `ValueSet`.
     </span><span class="kw">pub fn </span>record_all(<span class="kw-2">&amp;</span><span class="self">self</span>, values: <span class="kw-2">&amp;</span>field::ValueSet&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; <span class="kw-2">&amp;</span><span class="self">Self </span>{
         <span class="kw">let </span>record = Record::new(values);
         <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>inner) = <span class="self">self</span>.inner {
             inner.record(<span class="kw-2">&amp;</span>record);
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(_meta) = <span class="self">self</span>.meta {
             <span class="macro">if_log_enabled! </span>{ <span class="kw-2">*</span>_meta.level(), {
                 <span class="kw">let </span>target = <span class="kw">if </span>record.is_empty() {
                     LIFECYCLE_LOG_TARGET
                 } <span class="kw">else </span>{
                     _meta.target()
                 };
                 <span class="self">self</span>.log(
                     target,
                     <span class="macro">level_to_log!</span>(<span class="kw-2">*</span>_meta.level()),
                     <span class="macro">format_args!</span>(<span class="string">&quot;{};{}&quot;</span>, _meta.name(), <span class="kw">crate</span>::log::LogValueSet { values, is_first: <span class="bool-val">false </span>}),
                 );
             }}
         }

         <span class="self">self
     </span>}

     <span class="doccomment">/// Returns `true` if this span was disabled by the subscriber and does not
     /// exist.
     ///
     /// See also [`is_none`].
     ///
     /// [`is_none`]: Span::is_none()
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>is_disabled(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.inner.is_none()
     }

     <span class="doccomment">/// Returns `true` if this span was constructed by [`Span::none`] and is
     /// empty.
     ///
     /// If `is_none` returns `true` for a given span, then [`is_disabled`] will
     /// also return `true`. However, when a span is disabled by the subscriber
     /// rather than constructed by `Span::none`, this method will return
     /// `false`, while `is_disabled` will return `true`.
     ///
     /// [`Span::none`]: Span::none()
     /// [`is_disabled`]: Span::is_disabled()
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>is_none(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.is_disabled() &amp;&amp; <span class="self">self</span>.meta.is_none()
     }

     <span class="doccomment">/// Indicates that the span with the given ID has an indirect causal
     /// relationship with this span.
     ///
     /// This relationship differs somewhat from the parent-child relationship: a
     /// span may have any number of prior spans, rather than a single one; and
     /// spans are not considered to be executing _inside_ of the spans they
     /// follow from. This means that a span may close even if subsequent spans
     /// that follow from it are still open, and time spent inside of a
     /// subsequent span should not be included in the time its precedents were
     /// executing. This is used to model causal relationships such as when a
     /// single future spawns several related background tasks, et cetera.
     ///
     /// If this span is disabled, or the resulting follows-from relationship
     /// would be invalid, this function will do nothing.
     ///
     /// # Examples
     ///
     /// Setting a `follows_from` relationship with a `Span`:
     /// ```
     /// # use tracing::{span, Id, Level, Span};
     /// let span1 = span!(Level::INFO, &quot;span_1&quot;);
     /// let span2 = span!(Level::DEBUG, &quot;span_2&quot;);
     /// span2.follows_from(span1);
     /// ```
     ///
     /// Setting a `follows_from` relationship with the current span:
     /// ```
     /// # use tracing::{span, Id, Level, Span};
     /// let span = span!(Level::INFO, &quot;hello!&quot;);
     /// span.follows_from(Span::current());
     /// ```
     ///
     /// Setting a `follows_from` relationship with a `Span` reference:
     /// ```
     /// # use tracing::{span, Id, Level, Span};
     /// let span = span!(Level::INFO, &quot;hello!&quot;);
     /// let curr = Span::current();
     /// span.follows_from(&amp;curr);
     /// ```
     ///
     /// Setting a `follows_from` relationship with an `Id`:
     /// ```
     /// # use tracing::{span, Id, Level, Span};
     /// let span = span!(Level::INFO, &quot;hello!&quot;);
     /// let id = span.id();
     /// span.follows_from(id);
     /// ```
     </span><span class="kw">pub fn </span>follows_from(<span class="kw-2">&amp;</span><span class="self">self</span>, from: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;Id&gt;&gt;) -&gt; <span class="kw-2">&amp;</span><span class="self">Self </span>{
         <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>inner) = <span class="self">self</span>.inner {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(from) = from.into() {
                 inner.follows_from(<span class="kw-2">&amp;</span>from);
             }
         }
         <span class="self">self
     </span>}

     <span class="doccomment">/// Returns this span&#39;s `Id`, if it is enabled.
     </span><span class="kw">pub fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Id&gt; {
         <span class="self">self</span>.inner.as_ref().map(Inner::id)
     }

     <span class="doccomment">/// Returns this span&#39;s `Metadata`, if it is enabled.
     </span><span class="kw">pub fn </span>metadata(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Metadata&lt;<span class="lifetime">&#39;static</span>&gt;&gt; {
         <span class="self">self</span>.meta
     }

     <span class="attribute">#[cfg(feature = <span class="string">&quot;log&quot;</span>)]
     #[inline]
     </span><span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, target: <span class="kw-2">&amp;</span>str, level: log::Level, message: fmt::Arguments&lt;<span class="lifetime">&#39;_</span>&gt;) {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(meta) = <span class="self">self</span>.meta {
             <span class="kw">if </span><span class="macro">level_to_log!</span>(<span class="kw-2">*</span>meta.level()) &lt;= log::max_level() {
                 <span class="kw">let </span>logger = log::logger();
                 <span class="kw">let </span>log_meta = log::Metadata::builder().level(level).target(target).build();
                 <span class="kw">if </span>logger.enabled(<span class="kw-2">&amp;</span>log_meta) {
                     <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>inner) = <span class="self">self</span>.inner {
                         logger.log(
                             <span class="kw-2">&amp;</span>log::Record::builder()
                                 .metadata(log_meta)
                                 .module_path(meta.module_path())
                                 .file(meta.file())
                                 .line(meta.line())
                                 .args(<span class="macro">format_args!</span>(<span class="string">&quot;{} span={}&quot;</span>, message, inner.id.into_u64()))
                                 .build(),
                         );
                     } <span class="kw">else </span>{
                         logger.log(
                             <span class="kw-2">&amp;</span>log::Record::builder()
                                 .metadata(log_meta)
                                 .module_path(meta.module_path())
                                 .file(meta.file())
                                 .line(meta.line())
                                 .args(message)
                                 .build(),
                         );
                     }
                 }
             }
         }
     }

     <span class="doccomment">/// Invokes a function with a reference to this span&#39;s ID and subscriber.
     ///
     /// if this span is enabled, the provided function is called, and the result is returned.
     /// If the span is disabled, the function is not called, and this method returns `None`
     /// instead.
     </span><span class="kw">pub fn </span>with_subscriber&lt;T&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw">impl </span>FnOnce((<span class="kw-2">&amp;</span>Id, <span class="kw-2">&amp;</span>Dispatch)) -&gt; T) -&gt; <span class="prelude-ty">Option</span>&lt;T&gt; {
         <span class="self">self</span>.inner
             .as_ref()
             .map(|inner| f((<span class="kw-2">&amp;</span>inner.id, <span class="kw-2">&amp;</span>inner.subscriber)))
     }
 }

 <span class="kw">impl </span>cmp::PartialEq <span class="kw">for </span>Span {
     <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="kw">match </span>(<span class="kw-2">&amp;</span><span class="self">self</span>.meta, <span class="kw-2">&amp;</span>other.meta) {
             (<span class="prelude-val">Some</span>(this), <span class="prelude-val">Some</span>(that)) =&gt; {
                 this.callsite() == that.callsite() &amp;&amp; <span class="self">self</span>.inner == other.inner
             }
             <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
         }
     }
 }

 <span class="kw">impl </span>Hash <span class="kw">for </span>Span {
     <span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, hasher: <span class="kw-2">&amp;mut </span>H) {
         <span class="self">self</span>.inner.hash(hasher);
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Span {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="kw">let </span><span class="kw-2">mut </span>span = f.debug_struct(<span class="string">&quot;Span&quot;</span>);
         <span class="kw">if let </span><span class="prelude-val">Some</span>(meta) = <span class="self">self</span>.meta {
             span.field(<span class="string">&quot;name&quot;</span>, <span class="kw-2">&amp;</span>meta.name())
                 .field(<span class="string">&quot;level&quot;</span>, <span class="kw-2">&amp;</span>meta.level())
                 .field(<span class="string">&quot;target&quot;</span>, <span class="kw-2">&amp;</span>meta.target());

             <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>inner) = <span class="self">self</span>.inner {
                 span.field(<span class="string">&quot;id&quot;</span>, <span class="kw-2">&amp;</span>inner.id());
             } <span class="kw">else </span>{
                 span.field(<span class="string">&quot;disabled&quot;</span>, <span class="kw-2">&amp;</span><span class="bool-val">true</span>);
             }

             <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>path) = meta.module_path() {
                 span.field(<span class="string">&quot;module_path&quot;</span>, <span class="kw-2">&amp;</span>path);
             }

             <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>line) = meta.line() {
                 span.field(<span class="string">&quot;line&quot;</span>, <span class="kw-2">&amp;</span>line);
             }

             <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>file) = meta.file() {
                 span.field(<span class="string">&quot;file&quot;</span>, <span class="kw-2">&amp;</span>file);
             }
         } <span class="kw">else </span>{
             span.field(<span class="string">&quot;none&quot;</span>, <span class="kw-2">&amp;</span><span class="bool-val">true</span>);
         }

         span.finish()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; From&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Span&gt; <span class="kw">for </span><span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Id&gt; {
     <span class="kw">fn </span>from(span: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Span) -&gt; <span class="self">Self </span>{
         span.inner.as_ref().map(|inner| <span class="kw-2">&amp;</span>inner.id)
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; From&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Span&gt; <span class="kw">for </span><span class="prelude-ty">Option</span>&lt;Id&gt; {
     <span class="kw">fn </span>from(span: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Span) -&gt; <span class="self">Self </span>{
         span.inner.as_ref().map(Inner::id)
     }
 }

 <span class="kw">impl </span>From&lt;Span&gt; <span class="kw">for </span><span class="prelude-ty">Option</span>&lt;Id&gt; {
     <span class="kw">fn </span>from(span: Span) -&gt; <span class="self">Self </span>{
         span.inner.as_ref().map(Inner::id)
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; From&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>EnteredSpan&gt; <span class="kw">for </span><span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Id&gt; {
     <span class="kw">fn </span>from(span: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>EnteredSpan) -&gt; <span class="self">Self </span>{
         span.inner.as_ref().map(|inner| <span class="kw-2">&amp;</span>inner.id)
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; From&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>EnteredSpan&gt; <span class="kw">for </span><span class="prelude-ty">Option</span>&lt;Id&gt; {
     <span class="kw">fn </span>from(span: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>EnteredSpan) -&gt; <span class="self">Self </span>{
         span.inner.as_ref().map(Inner::id)
     }
 }

 <span class="kw">impl </span>Drop <span class="kw">for </span>Span {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(Inner {
             <span class="kw-2">ref </span>id,
             <span class="kw-2">ref </span>subscriber,
         }) = <span class="self">self</span>.inner
         {
             subscriber.try_close(id.clone());
         }

         <span class="macro">if_log_enabled! </span>{ <span class="kw">crate</span>::Level::TRACE, {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(meta) = <span class="self">self</span>.meta {
                 <span class="self">self</span>.log(
                     LIFECYCLE_LOG_TARGET,
                     log::Level::Trace,
                     <span class="macro">format_args!</span>(<span class="string">&quot;-- {};&quot;</span>, meta.name()),
                 );
             }
         }}
     }
 }

 <span class="comment">// ===== impl Inner =====

 </span><span class="kw">impl </span>Inner {
     <span class="doccomment">/// Indicates that the span with the given ID has an indirect causal
     /// relationship with this span.
     ///
     /// This relationship differs somewhat from the parent-child relationship: a
     /// span may have any number of prior spans, rather than a single one; and
     /// spans are not considered to be executing _inside_ of the spans they
     /// follow from. This means that a span may close even if subsequent spans
     /// that follow from it are still open, and time spent inside of a
     /// subsequent span should not be included in the time its precedents were
     /// executing. This is used to model causal relationships such as when a
     /// single future spawns several related background tasks, et cetera.
     ///
     /// If this span is disabled, this function will do nothing. Otherwise, it
     /// returns `Ok(())` if the other span was added as a precedent of this
     /// span, or an error if this was not possible.
     </span><span class="kw">fn </span>follows_from(<span class="kw-2">&amp;</span><span class="self">self</span>, from: <span class="kw-2">&amp;</span>Id) {
         <span class="self">self</span>.subscriber.record_follows_from(<span class="kw-2">&amp;</span><span class="self">self</span>.id, from)
     }

     <span class="doccomment">/// Returns the span&#39;s ID.
     </span><span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Id {
         <span class="self">self</span>.id.clone()
     }

     <span class="kw">fn </span>record(<span class="kw-2">&amp;</span><span class="self">self</span>, values: <span class="kw-2">&amp;</span>Record&lt;<span class="lifetime">&#39;_</span>&gt;) {
         <span class="self">self</span>.subscriber.record(<span class="kw-2">&amp;</span><span class="self">self</span>.id, values)
     }

     <span class="kw">fn </span>new(id: Id, subscriber: <span class="kw-2">&amp;</span>Dispatch) -&gt; <span class="self">Self </span>{
         Inner {
             id,
             subscriber: subscriber.clone(),
         }
     }
 }

 <span class="kw">impl </span>cmp::PartialEq <span class="kw">for </span>Inner {
     <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.id == other.id
     }
 }

 <span class="kw">impl </span>Hash <span class="kw">for </span>Inner {
     <span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H) {
         <span class="self">self</span>.id.hash(state);
     }
 }

 <span class="kw">impl </span>Clone <span class="kw">for </span>Inner {
     <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
         Inner {
             id: <span class="self">self</span>.subscriber.clone_span(<span class="kw-2">&amp;</span><span class="self">self</span>.id),
             subscriber: <span class="self">self</span>.subscriber.clone(),
         }
     }
 }

 <span class="comment">// ===== impl Entered =====

 </span><span class="kw">impl </span>EnteredSpan {
     <span class="doccomment">/// Returns this span&#39;s `Id`, if it is enabled.
     </span><span class="kw">pub fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Id&gt; {
         <span class="self">self</span>.inner.as_ref().map(Inner::id)
     }

     <span class="doccomment">/// Exits this span, returning the underlying [`Span`].
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>exit(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; Span {
         <span class="comment">// One does not simply move out of a struct with `Drop`.
         </span><span class="kw">let </span>span = mem::replace(<span class="kw-2">&amp;mut </span><span class="self">self</span>.span, Span::none());
         span.do_exit();
         span
     }
 }

 <span class="kw">impl </span>Deref <span class="kw">for </span>EnteredSpan {
     <span class="kw">type </span>Target = Span;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Span {
         <span class="kw-2">&amp;</span><span class="self">self</span>.span
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Drop <span class="kw">for </span>Entered&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.span.do_exit()
     }
 }

 <span class="kw">impl </span>Drop <span class="kw">for </span>EnteredSpan {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.span.do_exit()
     }
 }

 <span class="doccomment">/// Technically, `EnteredSpan` _can_ implement both `Send` *and*
 /// `Sync` safely. It doesn&#39;t, because it has a `PhantomNotSend` field,
 /// specifically added in order to make it `!Send`.
 ///
 /// Sending an `EnteredSpan` guard between threads cannot cause memory unsafety.
 /// However, it *would* result in incorrect behavior, so we add a
 /// `PhantomNotSend` to prevent it from being sent between threads. This is
 /// because it must be *dropped* on the same thread that it was created;
 /// otherwise, the span will never be exited on the thread where it was entered,
 /// and it will attempt to exit the span on a thread that may never have entered
 /// it. However, we still want them to be `Sync` so that a struct holding an
 /// `Entered` guard can be `Sync`.
 ///
 /// Thus, this is totally safe.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">struct </span>PhantomNotSend {
     ghost: PhantomData&lt;<span class="kw-2">*mut </span>()&gt;,
 }

 <span class="attribute">#[allow(non_upper_case_globals)]
 </span><span class="kw">const </span>PhantomNotSend: PhantomNotSend = PhantomNotSend { ghost: PhantomData };

 <span class="doccomment">/// # Safety
 ///
 /// Trivially safe, as `PhantomNotSend` doesn&#39;t have any API.
 </span><span class="kw">unsafe impl </span>Sync <span class="kw">for </span>PhantomNotSend {}

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>test {
     <span class="kw">use super</span>::<span class="kw-2">*</span>;

     <span class="kw">trait </span>AssertSend: Send {}
     <span class="kw">impl </span>AssertSend <span class="kw">for </span>Span {}

     <span class="kw">trait </span>AssertSync: Sync {}
     <span class="kw">impl </span>AssertSync <span class="kw">for </span>Span {}
     <span class="kw">impl </span>AssertSync <span class="kw">for </span>Entered&lt;<span class="lifetime">&#39;_</span>&gt; {}
     <span class="kw">impl </span>AssertSync <span class="kw">for </span>EnteredSpan {}

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_record_backwards_compat() {
         Span::current().record(<span class="string">&quot;some-key&quot;</span>, <span class="kw-2">&amp;</span><span class="string">&quot;some text&quot;</span>);
         Span::current().record(<span class="string">&quot;some-key&quot;</span>, <span class="kw-2">&amp;</span><span class="bool-val">false</span>);
     }
 }
 </code></pre></div>
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