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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="Utilities for working with fields and field visitors."><title>tracing_subscriber::field - Rust</title><script> if (window.location.protocol !== "file:") document.write(`<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">`)</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-e935ef01ae1c1829.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.78.0 (9b00956e5 2024-04-29)" data-channel="1.78.0" data-search-js="search-42d8da7a6b9792c2.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-4c98445ec4002617.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-12cf3b4f4f9dc36d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-04d5337699b92874.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 mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing_subscriber/index.html">tracing_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">Module field</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#modules">Modules</a></li><li><a href="#traits">Traits</a></li></ul></section><h2><a href="../index.html">In crate tracing_subscriber</a></h2></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../tracing_subscriber/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>Module <a href="../index.html">tracing_subscriber</a>::<wbr><a class="mod" href="#">field</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_subscriber/field/mod.rs.html#1-365">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Utilities for working with <a href="../../tracing_core/field/index.html" title="mod tracing_core::field">fields</a> and <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">field visitors</a>.</p>
</div></details><h2 id="modules" class="section-header">Modules<a href="#modules" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="debug/index.html" title="mod tracing_subscriber::field::debug">debug</a></div><div class="desc docblock-short"><code>MakeVisitor</code> wrappers for working with <code>fmt::Debug</code> fields.</div></li><li><div class="item-name"><a class="mod" href="delimited/index.html" title="mod tracing_subscriber::field::delimited">delimited</a></div><div class="desc docblock-short">A <code>MakeVisitor</code> wrapper that separates formatted fields with a delimiter.</div></li><li><div class="item-name"><a class="mod" href="display/index.html" title="mod tracing_subscriber::field::display">display</a></div><div class="desc docblock-short"><code>MakeVisitor</code> wrappers for working with <code>fmt::Display</code> fields.</div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.MakeExt.html" title="trait tracing_subscriber::field::MakeExt">MakeExt</a></div><div class="desc docblock-short">Extension trait providing <code>MakeVisitor</code> combinators.</div></li><li><div class="item-name"><a class="trait" href="trait.MakeOutput.html" title="trait tracing_subscriber::field::MakeOutput">MakeOutput</a></div><div class="desc docblock-short">Extension trait implemented for all <code>MakeVisitor</code> implementations that
produce a visitor implementing <code>VisitOutput</code>.</div></li><li><div class="item-name"><a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a></div><div class="desc docblock-short">Creates new <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitors</a>.</div></li><li><div class="item-name"><a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a></div><div class="desc docblock-short">Extension trait implemented by types which can be recorded by a <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a>.</div></li><li><div class="item-name"><a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a></div><div class="desc docblock-short">Visits typed values.</div></li><li><div class="item-name"><a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a></div><div class="desc docblock-short">Extension trait implemented by visitors to indicate that they write to a
<code>fmt::Write</code> instance, and allow access to that writer.</div></li><li><div class="item-name"><a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a></div><div class="desc docblock-short">A <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a> that produces output once it has visited a set of fields.</div></li><li><div class="item-name"><a class="trait" href="trait.VisitWrite.html" title="trait tracing_subscriber::field::VisitWrite">VisitWrite</a></div><div class="desc docblock-short">Extension trait implemented by visitors to indicate that they write to an
<code>io::Write</code> instance, and allow access to that writer.</div></li></ul></section></div></main></body></html>