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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="Trait used by `Serialize` implementations to generically construct errors belonging to the `Serializer` against which they are currently running."><title>Error in serde::ser - 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="serde" 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">&#9776;</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../serde/index.html">serde</a><span class="version">1.0.197</span></h2></div><h2 class="location"><a href="#">Error</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.custom">custom</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-Error-for-Error">Error</a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In serde::ser</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="../../serde/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">serde</a>::<wbr><a href="index.html">ser</a>::<wbr><a class="trait" href="#">Error</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/serde/ser/mod.rs.html#186">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub trait Error: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> {
// Required method
fn <a href="#tymethod.custom" class="fn">custom</a>&lt;T&gt;(msg: T) -&gt; Self
<span class="where">where T: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a></span>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Trait used by <code>Serialize</code> implementations to generically construct
errors belonging to the <code>Serializer</code> against which they are
currently running.</p>
<h2 id="example-implementation"><a href="#example-implementation">Example implementation</a></h2>
<p>The <a href="https://serde.rs/data-format.html">example data format</a> presented on the website shows an error
type appropriate for a basic JSON data format.</p>
</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.custom" class="method"><a class="src rightside" href="../../src/serde/ser/mod.rs.html#186">source</a><h4 class="code-header">fn <a href="#tymethod.custom" class="fn">custom</a>&lt;T&gt;(msg: T) -&gt; Self<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a>,</div></h4></section></summary><div class="docblock"><p>Used when a <a href="../trait.Serialize.html"><code>Serialize</code></a> implementation encounters any error
while serializing a type.</p>
<p>The message should not be capitalized and should not end with a
period.</p>
<p>For example, a filesystem <a href="https://doc.rust-lang.org/std/path/struct.Path.html"><code>Path</code></a> may refuse to serialize
itself if it contains invalid UTF-8 data.</p>
<div class="example-wrap edition"><a href="#" class="tooltip" title="This example runs with edition 2021"></a><pre class="rust rust-example-rendered"><code><span class="kw">use </span>serde::ser::{<span class="self">self</span>, Serialize, Serializer};
<span class="kw">impl </span>Serialize <span class="kw">for </span>Path {
<span class="kw">fn </span>serialize&lt;S&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, serializer: S) -&gt; <span class="prelude-ty">Result</span>&lt;S::Ok, S::Error&gt;
<span class="kw">where
</span>S: Serializer,
{
<span class="kw">match </span><span class="self">self</span>.to_str() {
<span class="prelude-val">Some</span>(s) =&gt; serializer.serialize_str(s),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(ser::Error::custom(<span class="string">"path contains invalid UTF-8 characters"</span>)),
}
}
}</code></pre></div>
</div></details></div><h2 id="object-safety" class="section-header">Object Safety<a href="#object-safety" class="anchor">§</a></h2><div class="object-safety-info">This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.76.0/reference/items/traits.html#object-safety">object safe</a>.</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-Error-for-Error" class="impl"><a class="src rightside" href="../../src/serde/ser/fmt.rs.html#4-8">source</a><a href="#impl-Error-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Error.html" title="trait serde::ser::Error">Error</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a></h3></section></summary><div class="impl-items"><section id="method.custom" class="method trait-impl"><a class="src rightside" href="../../src/serde/ser/fmt.rs.html#5-7">source</a><a href="#method.custom" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.custom" class="fn">custom</a>&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a>&gt;(_msg: T) -&gt; Self</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-Error-for-Error-1" class="impl"><a class="src rightside" href="../../src/serde/de/value.rs.html#83-91">source</a><a href="#impl-Error-for-Error-1" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Error.html" title="trait serde::ser::Error">Error</a> for serde::de::value::<a class="struct" href="../de/value/struct.Error.html" title="struct serde::de::value::Error">Error</a></h3></section></div><script src="../../trait.impl/serde/ser/trait.Error.js" data-ignore-extern-crates="core" async></script></section></div></main></body></html>