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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Constructs a span at the debug level."><title>debug_span in tracing - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-46132b98.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="tracing" data-themes="" data-resource-suffix="" data-rustdoc-version="1.85.0 (4d91de4e4 2025-02-17)" data-channel="1.85.0" data-search-js="search-75f5ac3e.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc macro"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../tracing/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../tracing/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../tracing/index.html">tracing</a><span class="version">0.1.41</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">debug_<wbr>span</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate tracing</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">tracing</a></span><h1>Macro <span class="macro">debug_span</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/tracing/macros.rs.html#248-293">Source</a> </span></div><pre class="rust item-decl"><code>macro_rules! debug_span {
(target: $target:expr, parent: $parent:expr, $name:expr, $($field:tt)*) => { ... };
(target: $target:expr, parent: $parent:expr, $name:expr) => { ... };
(parent: $parent:expr, $name:expr, $($field:tt)*) => { ... };
(parent: $parent:expr, $name:expr) => { ... };
(target: $target:expr, $name:expr, $($field:tt)*) => { ... };
(target: $target:expr, $name:expr) => { ... };
($name:expr, $($field:tt)*) => { ... };
($name:expr) => { ... };
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Constructs a span at the debug level.</p>
<p><a href="index.html#recording-fields" title="mod tracing">Fields</a> and <a href="index.html#configuring-attributes" title="mod tracing">attributes</a> are set using the same syntax as the <a href="macro.span.html" title="macro tracing::span"><code>span!</code></a>
macro.</p>
<p>See <a href="index.html#using-the-macros" title="mod tracing">the top-level documentation</a> for details on the syntax accepted by
this macro.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">debug_span!</span>(<span class="string">"my_span"</span>);
<span class="comment">// is equivalent to:
</span><span class="macro">span!</span>(Level::DEBUG, <span class="string">"my_span"</span>);</code></pre></div>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>span = <span class="macro">debug_span!</span>(<span class="string">"my span"</span>);
span.in_scope(|| {
<span class="comment">// do work inside the span...
</span>});</code></pre></div>
</div></details></section></div></main></body></html>