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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="Structured data associated with `Span`s and `Event`s."><meta name="keywords" content="rust, rustlang, rust-lang, field"><title>tracing::field - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../tracing/index.html'><div class='logo-container'><img src='https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png' alt='logo'></div></a><p class="location">Module field</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div><p class="location"><a href="../index.html">tracing</a></p><div id="sidebar-vars" data-name="field" data-ty="mod" data-relpath="../"></div><script defer src="../sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">tracing</a>::<wbr><a class="mod" href="">field</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/tracing/field.rs.html#1-62" title="goto source code">[src]</a></span></h1><div class="docblock"><p>Structured data associated with <code>Span</code>s and <code>Event</code>s.</p>
</div><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2>
<table><tr class="module-item"><td><a class="struct" href="struct.DebugValue.html" title="tracing::field::DebugValue struct">DebugValue</a></td><td class="docblock-short"><p>A <code>Value</code> which serializes as a string using <code>fmt::Debug</code>.</p>
</td></tr><tr class="module-item"><td><a class="struct" href="struct.DisplayValue.html" title="tracing::field::DisplayValue struct">DisplayValue</a></td><td class="docblock-short"><p>A <code>Value</code> which serializes using <code>fmt::Display</code>.</p>
</td></tr><tr class="module-item"><td><a class="struct" href="struct.Empty.html" title="tracing::field::Empty struct">Empty</a></td><td class="docblock-short"><p>An empty field.</p>
</td></tr><tr class="module-item"><td><a class="struct" href="struct.Field.html" title="tracing::field::Field struct">Field</a></td><td class="docblock-short"><p>An opaque key allowing <em>O</em>(1) access to a field in a <code>Span</code>’s key-value
data.</p>
</td></tr><tr class="module-item"><td><a class="struct" href="struct.FieldSet.html" title="tracing::field::FieldSet struct">FieldSet</a></td><td class="docblock-short"><p>Describes the fields present on a span.</p>
</td></tr><tr class="module-item"><td><a class="struct" href="struct.Iter.html" title="tracing::field::Iter struct">Iter</a></td><td class="docblock-short"><p>An iterator over a set of fields.</p>
</td></tr><tr class="module-item"><td><a class="struct" href="struct.ValueSet.html" title="tracing::field::ValueSet struct">ValueSet</a></td><td class="docblock-short"><p>A set of fields and values for a span.</p>
</td></tr></table><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2>
<table><tr class="module-item"><td><a class="trait" href="trait.AsField.html" title="tracing::field::AsField trait">AsField</a></td><td class="docblock-short"><p>Trait implemented to allow a type to be used as a field key.</p>
</td></tr><tr class="module-item"><td><a class="trait" href="trait.Value.html" title="tracing::field::Value trait">Value</a></td><td class="docblock-short"><p>A field value of an erased type.</p>
</td></tr><tr class="module-item"><td><a class="trait" href="trait.Visit.html" title="tracing::field::Visit trait">Visit</a></td><td class="docblock-short"><p>Visits typed values.</p>
</td></tr></table><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2>
<table><tr class="module-item"><td><a class="fn" href="fn.debug.html" title="tracing::field::debug fn">debug</a></td><td class="docblock-short"><p>Wraps a type implementing <code>fmt::Debug</code> as a <code>Value</code> that can be
recorded using its <code>Debug</code> implementation.</p>
</td></tr><tr class="module-item"><td><a class="fn" href="fn.display.html" title="tracing::field::display fn">display</a></td><td class="docblock-short"><p>Wraps a type implementing <code>fmt::Display</code> as a <code>Value</code> that can be
recorded using its <code>Display</code> implementation.</p>
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