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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A trait for extracting SpanTraces created by `in_current_span()` from `dyn Error` trait objects"><title>ExtractSpanTrace in tracing_error - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="tracing_error" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc trait"><!--[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">☰</button><a class="logo-container" href="../tracing_error/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_error/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../tracing_error/index.html">tracing_error</a><span class="version">0.2.0</span></h2></div><h2 class="location"><a href="#">ExtractSpanTrace</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.span_trace">span_trace</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-ExtractSpanTrace-for-dyn+Error">dyn Error + 'static</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In crate tracing_error</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../tracing_error/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="index.html">tracing_error</a>::<wbr><a class="trait" href="#">ExtractSpanTrace</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/tracing_error/error.rs.html#253-271">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait ExtractSpanTrace {
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// Required method
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fn <a href="#tymethod.span_trace" class="fn">span_trace</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&<a class="struct" href="struct.SpanTrace.html" title="struct tracing_error::SpanTrace">SpanTrace</a>>;
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A trait for extracting SpanTraces created by <code>in_current_span()</code> from <code>dyn Error</code> trait objects</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.span_trace" class="method"><a class="src rightside" href="../src/tracing_error/error.rs.html#270">source</a><h4 class="code-header">fn <a href="#tymethod.span_trace" class="fn">span_trace</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&<a class="struct" href="struct.SpanTrace.html" title="struct tracing_error::SpanTrace">SpanTrace</a>></h4></section></summary><div class="docblock"><p>Attempts to downcast to a <code>TracedError</code> and return a reference to its
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SpanTrace</p>
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<h5 id="examples"><a href="#examples">Examples</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_error::ExtractSpanTrace;
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<span class="kw">use </span>std::error::Error;
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<span class="kw">fn </span>print_span_trace(e: <span class="kw-2">&</span>(<span class="kw">dyn </span>Error + <span class="lifetime">'static</span>)) {
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<span class="kw">let </span>span_trace = e.span_trace();
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<span class="kw">if let </span><span class="prelude-val">Some</span>(span_trace) = span_trace {
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<span class="macro">println!</span>(<span class="string">"{}"</span>, span_trace);
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}
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}</code></pre></div>
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</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-ExtractSpanTrace-for-dyn+Error" class="impl"><a class="src rightside" href="../src/tracing_error/error.rs.html#284-289">source</a><a href="#impl-ExtractSpanTrace-for-dyn+Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ExtractSpanTrace.html" title="trait tracing_error::ExtractSpanTrace">ExtractSpanTrace</a> for dyn <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/error/trait.Error.html" title="trait core::error::Error">Error</a> + 'static</h3></section></summary><div class="impl-items"><section id="method.span_trace" class="method trait-impl"><a class="src rightside" href="../src/tracing_error/error.rs.html#285-288">source</a><a href="#method.span_trace" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.span_trace" class="fn">span_trace</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&<a class="struct" href="struct.SpanTrace.html" title="struct tracing_error::SpanTrace">SpanTrace</a>></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/tracing_error/error/trait.ExtractSpanTrace.js" data-ignore-extern-crates="core" async></script></section></div></main></body></html>
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