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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="API documentation for the Rust `error` macro in crate `tracing`."><meta name="keywords" content="rust, rustlang, rust-lang, error"><title>tracing::error - 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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<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">Macro <a href="index.html">tracing</a>::<wbr><a class="macro" href="">error</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">−</span>]</a></span><a class="srclink" href="../src/tracing/macros.rs.html#1643-1819" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><div class="example-wrap"><pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">error</span> {
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, <span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> }, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">*</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, <span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">+</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, <span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, <span class="question-mark">?</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">+</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, <span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, <span class="op">%</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">+</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, <span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">+</span> }, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> <span class="op">=</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, <span class="question-mark">?</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> <span class="op">=</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, <span class="op">%</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> <span class="op">=</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, <span class="question-mark">?</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, <span class="op">%</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">parent</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> }, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">*</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, <span class="question-mark">?</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, <span class="op">%</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> ) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span> ) <span class="op">=</span><span class="op">></span> { ... };
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({ $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">+</span> }, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span> ) <span class="op">=</span><span class="op">></span> { ... };
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> <span class="op">=</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="question-mark">?</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> <span class="op">=</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="op">%</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span> <span class="op">=</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="question-mark">?</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="op">%</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="question-mark">?</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="op">%</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>) <span class="op">=</span><span class="op">></span> { ... };
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>).<span class="op">+</span>) <span class="op">=</span><span class="op">></span> { ... };
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=</span><span class="op">></span> { ... };
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}</pre></div>
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</div><div class="docblock"><p>Constructs an event at the error level.</p>
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<p>This functions similarly to the <a href="macro.event.html"><code>event!</code></a> macro. See <a href="index.html#using-the-macros">the top-level
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documentation</a> for details on the syntax accepted by
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this macro.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">tracing</span>::<span class="ident">error</span>;
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<span class="kw">let</span> (<span class="ident">err_info</span>, <span class="ident">port</span>) <span class="op">=</span> (<span class="string">"No connection"</span>, <span class="number">22</span>);
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<span class="macro">error</span><span class="macro">!</span>(<span class="ident">port</span>, <span class="ident">error</span> <span class="op">=</span> <span class="op">%</span><span class="ident">err_info</span>);
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<span class="macro">error</span><span class="macro">!</span>(<span class="ident">target</span>: <span class="string">"app_events"</span>, <span class="string">"App Error: {}"</span>, <span class="ident">err_info</span>);
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<span class="macro">error</span><span class="macro">!</span>({ <span class="ident">info</span> <span class="op">=</span> <span class="ident">err_info</span> }, <span class="string">"error on port: {}"</span>, <span class="ident">port</span>);</pre></div>
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