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<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="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.invalid_type">invalid_type</a><a href="#method.invalid_value">invalid_value</a><a href="#method.invalid_length">invalid_length</a><a href="#method.unknown_variant">unknown_variant</a><a href="#method.unknown_field">unknown_field</a><a href="#method.missing_field">missing_field</a><a href="#method.duplicate_field">duplicate_field</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'>de</a></p><script>window.sidebarCurrent = {name: 'Error', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>serde</a>::<wbr><a href='index.html'>de</a>::<wbr><a class="trait" href=''>Error</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../../src/serde/de/mod.rs.html#159-285' title='goto source code'>[src]</a></span></h1>
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<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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fn <a href='#method.invalid_type' class='fnname'>invalid_type</a>(unexp: <a class="enum" href="../../serde/de/enum.Unexpected.html" title="enum serde::de::Unexpected">Unexpected</a>, exp: &<a class="trait" href="../../serde/de/trait.Expected.html" title="trait serde::de::Expected">Expected</a>) -> Self { ... }
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<div class='item-spacer'></div> fn <a href='#method.invalid_value' class='fnname'>invalid_value</a>(unexp: <a class="enum" href="../../serde/de/enum.Unexpected.html" title="enum serde::de::Unexpected">Unexpected</a>, exp: &<a class="trait" href="../../serde/de/trait.Expected.html" title="trait serde::de::Expected">Expected</a>) -> Self { ... }
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<div class='item-spacer'></div> fn <a href='#method.invalid_length' class='fnname'>invalid_length</a>(len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, exp: &<a class="trait" href="../../serde/de/trait.Expected.html" title="trait serde::de::Expected">Expected</a>) -> Self { ... }
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<div class='item-spacer'></div> fn <a href='#method.unknown_variant' class='fnname'>unknown_variant</a>(variant: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, expected: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'static [</a>&'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> Self { ... }
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<div class='item-spacer'></div> fn <a href='#method.unknown_field' class='fnname'>unknown_field</a>(field: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, expected: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'static [</a>&'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> Self { ... }
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<div class='item-spacer'></div> fn <a href='#method.missing_field' class='fnname'>missing_field</a>(field: &'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> Self { ... }
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<div class='item-spacer'></div> fn <a href='#method.duplicate_field' class='fnname'>duplicate_field</a>(field: &'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> Self { ... }
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}</pre><div class='docblock'><p>The <code>Error</code> trait allows <code>Deserialize</code> implementations to create descriptive
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error messages belonging to the <code>Deserializer</code> against which they are
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||
currently running.</p>
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<p>Every <code>Deserializer</code> declares an <code>Error</code> type that encompasses both
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||
general-purpose deserialization errors as well as errors specific to the
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||
particular deserialization format. For example the <code>Error</code> type of
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||
<code>serde_json</code> can represent errors like an invalid JSON escape sequence or an
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||
unterminated string literal, in addition to the error cases that are part of
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||
this trait.</p>
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<p>Most deserializers should only need to provide the <code>Error::custom</code> method
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and inherit the default behavior for the other methods.</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'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.custom' class='method'><span id='custom.v' class='invisible'><code>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></span></h3><div class='docblock'><p>Raised when there is general error when deserializing a type.</p>
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<p>The message should not be capitalized and should not end with a period.</p>
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<pre class="rust rust-example-rendered">
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||
<span class="kw">use</span> <span class="ident">serde</span>::<span class="ident">de</span>::{<span class="self">self</span>, <span class="ident">Deserialize</span>, <span class="ident">Deserializer</span>};
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<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'de</span><span class="op">></span> <span class="ident">Deserialize</span><span class="op"><</span><span class="lifetime">'de</span><span class="op">></span> <span class="kw">for</span> <span class="ident">IpAddr</span> {
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||
<span class="kw">fn</span> <span class="ident">deserialize</span><span class="op"><</span><span class="ident">D</span><span class="op">></span>(<span class="ident">deserializer</span>: <span class="ident">D</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">D</span>::<span class="ident">Error</span><span class="op">></span>
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<span class="kw">where</span>
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<span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op"><</span><span class="lifetime">'de</span><span class="op">></span>,
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||
{
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||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">String</span>::<span class="ident">deserialize</span>(<span class="ident">deserializer</span>));
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||
<span class="ident">s</span>.<span class="ident">parse</span>().<span class="ident">map_err</span>(<span class="ident">de</span>::<span class="ident">Error</span>::<span class="ident">custom</span>)
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}
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||
}</pre>
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</div></div>
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<h2 id='provided-methods' class='small-section-header'>
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Provided Methods<a href='#provided-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='method.invalid_type' class='method'><span id='invalid_type.v' class='invisible'><code>fn <a href='#method.invalid_type' class='fnname'>invalid_type</a>(unexp: <a class="enum" href="../../serde/de/enum.Unexpected.html" title="enum serde::de::Unexpected">Unexpected</a>, exp: &<a class="trait" href="../../serde/de/trait.Expected.html" title="trait serde::de::Expected">Expected</a>) -> Self</code></span></h3><div class='docblock'><p>Raised when a <code>Deserialize</code> receives a type different from what it was
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expecting.</p>
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||
<p>The <code>unexp</code> argument provides information about what type was received.
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||
This is the type that was present in the input file or other source data
|
||
of the Deserializer.</p>
|
||
<p>The <code>exp</code> argument provides information about what type was being
|
||
expected. This is the type that is written in the program.</p>
|
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<p>For example if we try to deserialize a String out of a JSON file
|
||
containing an integer, the unexpected type is the integer and the
|
||
expected type is the string.</p>
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||
</div><h3 id='method.invalid_value' class='method'><span id='invalid_value.v' class='invisible'><code>fn <a href='#method.invalid_value' class='fnname'>invalid_value</a>(unexp: <a class="enum" href="../../serde/de/enum.Unexpected.html" title="enum serde::de::Unexpected">Unexpected</a>, exp: &<a class="trait" href="../../serde/de/trait.Expected.html" title="trait serde::de::Expected">Expected</a>) -> Self</code></span></h3><div class='docblock'><p>Raised when a <code>Deserialize</code> receives a value of the right type but that
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||
is wrong for some other reason.</p>
|
||
<p>The <code>unexp</code> argument provides information about what value was received.
|
||
This is the value that was present in the input file or other source
|
||
data of the Deserializer.</p>
|
||
<p>The <code>exp</code> argument provides information about what value was being
|
||
expected. This is the type that is written in the program.</p>
|
||
<p>For example if we try to deserialize a String out of some binary data
|
||
that is not valid UTF-8, the unexpected value is the bytes and the
|
||
expected value is a string.</p>
|
||
</div><h3 id='method.invalid_length' class='method'><span id='invalid_length.v' class='invisible'><code>fn <a href='#method.invalid_length' class='fnname'>invalid_length</a>(len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, exp: &<a class="trait" href="../../serde/de/trait.Expected.html" title="trait serde::de::Expected">Expected</a>) -> Self</code></span></h3><div class='docblock'><p>Raised when deserializing a sequence or map and the input data contains
|
||
too many or too few elements.</p>
|
||
<p>The <code>len</code> argument is the number of elements encountered. The sequence
|
||
or map may have expected more arguments or fewer arguments.</p>
|
||
<p>The <code>exp</code> argument provides information about what data was being
|
||
expected. For example <code>exp</code> might say that a tuple of size 6 was
|
||
expected.</p>
|
||
</div><h3 id='method.unknown_variant' class='method'><span id='unknown_variant.v' class='invisible'><code>fn <a href='#method.unknown_variant' class='fnname'>unknown_variant</a>(variant: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, expected: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'static [</a>&'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> Self</code></span></h3><div class='docblock'><p>Raised when a <code>Deserialize</code> enum type received a variant with an
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||
unrecognized name.</p>
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||
</div><h3 id='method.unknown_field' class='method'><span id='unknown_field.v' class='invisible'><code>fn <a href='#method.unknown_field' class='fnname'>unknown_field</a>(field: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, expected: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'static [</a>&'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> Self</code></span></h3><div class='docblock'><p>Raised when a <code>Deserialize</code> struct type received a field with an
|
||
unrecognized name.</p>
|
||
</div><h3 id='method.missing_field' class='method'><span id='missing_field.v' class='invisible'><code>fn <a href='#method.missing_field' class='fnname'>missing_field</a>(field: &'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> Self</code></span></h3><div class='docblock'><p>Raised when a <code>Deserialize</code> struct type expected to receive a required
|
||
field with a particular name but that field was not present in the
|
||
input.</p>
|
||
</div><h3 id='method.duplicate_field' class='method'><span id='duplicate_field.v' class='invisible'><code>fn <a href='#method.duplicate_field' class='fnname'>duplicate_field</a>(field: &'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> Self</code></span></h3><div class='docblock'><p>Raised when a <code>Deserialize</code> struct type received more than one of the
|
||
same field.</p>
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</div></div>
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Implementors<a href='#implementors' class='anchor'></a>
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<li><div class='out-of-band'><a class='srclink' href='../../src/serde/de/value.rs.html#75-96' title='goto source code'>[src]</a></div><code>impl Error for <a class="struct" href="../../serde/de/value/struct.Error.html" title="struct serde::de::value::Error">Error</a></code></li>
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