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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` trait in crate `serde`."><meta name="keywords" content="rust, rustlang, rust-lang, Error"><title>serde::ser::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="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[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">☰</div><a href='../../serde/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a><p class='location'>Trait Error</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.custom">custom</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>serde</a>::<wbr><a href='index.html'>ser</a></p><script>window.sidebarCurrent = {name: 'Error', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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='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/serde/ser/mod.rs.html#131-170' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>serde</a>::<wbr><a href='index.html'>ser</a>::<wbr><a class="trait" href=''>Error</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait Error: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> {
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fn <a href='#tymethod.custom' class='fnname'>custom</a><T>(msg: T) -> Self<br> <span class="where">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a></span>;
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}</pre></div><div class='docblock'><p>Trait used by <code>Serialize</code> implementations to generically construct
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errors belonging to the <code>Serializer</code> against which they are
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currently running.</p>
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<h1 id="example-implementation" class="section-header"><a href="#example-implementation">Example implementation</a></h1>
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<p>The <a href="https://serde.rs/data-format.html">example data format</a> presented on the website shows an error
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type appropriate for a basic JSON data format.</p>
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</div>
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<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.custom' class='method'><code id='custom.v'>fn <a href='#tymethod.custom' class='fnname'>custom</a><T>(msg: T) -> Self <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a>, </span></code></h3><div class='docblock'><p>Used when a <a href="../trait.Serialize.html"><code>Serialize</code></a> implementation encounters any error
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while serializing a type.</p>
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<p>The message should not be capitalized and should not end with a
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period.</p>
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<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
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itself if it contains invalid UTF-8 data.</p>
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<pre><code class="language-edition2018"># struct Path;
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#
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# impl Path {
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# fn to_str(&self) -> Option<&str> {
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# unimplemented!()
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# }
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# }
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#
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use serde::ser::{self, Serialize, Serializer};
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impl Serialize for Path {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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match self.to_str() {
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Some(s) => serializer.serialize_str(s),
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None => Err(ser::Error::custom("path contains invalid UTF-8 characters")),
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}
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}
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}
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</code></pre>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-Error' class='impl'><code class='in-band'>impl Error for <a class="struct" href="../../serde/de/value/struct.Error.html" title="struct serde::de::value::Error">Error</a></code><a href='#impl-Error' class='anchor'></a><a class='srclink' href='../../src/serde/de/value.rs.html#84-92' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.custom' class="method hidden"><code id='custom.v-1'>fn <a href='#method.custom' class='fnname'>custom</a><T>(msg: T) -> Self <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a>, </span></code><a class='srclink' href='../../src/serde/de/value.rs.html#86-91' title='goto source code'>[src]</a></h4></div></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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