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<title>language_tags::Error - Rust</title>
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<p class='location'>Enum Error</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#variants">Variants</a><div class="sidebar-links"><a href="#variant.DuplicateExtension">DuplicateExtension</a><a href="#variant.EmptyExtension">EmptyExtension</a><a href="#variant.EmptyPrivateUse">EmptyPrivateUse</a><a href="#variant.ForbiddenChar">ForbiddenChar</a><a href="#variant.InvalidSubtag">InvalidSubtag</a><a href="#variant.InvalidLanguage">InvalidLanguage</a><a href="#variant.SubtagTooLong">SubtagTooLong</a><a href="#variant.TooManyExtlangs">TooManyExtlangs</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Eq">Eq</a><a href="#impl-PartialEq">PartialEq</a><a href="#impl-ErrorTrait">ErrorTrait</a><a href="#impl-Display">Display</a></div></div><p class='location'><a href='index.html'>language_tags</a></p><script>window.sidebarCurrent = {name: 'Error', ty: 'enum', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Enum <a href='index.html'>language_tags</a>::<wbr><a class="enum" href=''>Error</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>&#x2212;</span>]
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</span><a class='srclink' href='../src/language_tags/lib.rs.html#79-96' title='goto source code'>[src]</a></span></h1>
<pre class='rust enum'>pub enum Error {
DuplicateExtension,
EmptyExtension,
EmptyPrivateUse,
ForbiddenChar,
InvalidSubtag,
InvalidLanguage,
SubtagTooLong,
TooManyExtlangs,
}</pre><div class='docblock'><p>Defines an Error type for langtags.</p>
<p>Errors occur mainly during parsing of language tags.</p>
</div><h2 id='variants' class='variants small-section-header'>
Variants<a href='#variants' class='anchor'></a></h2>
<span id="variant.DuplicateExtension" class="variant small-section-header"><a href="#variant.DuplicateExtension" class="anchor field"></a><span id='DuplicateExtension.v' class='invisible'><code>DuplicateExtension</code></span></span><div class='docblock'><p>The same extension subtag is only allowed once in a tag before the private use part.</p>
</div><span id="variant.EmptyExtension" class="variant small-section-header"><a href="#variant.EmptyExtension" class="anchor field"></a><span id='EmptyExtension.v' class='invisible'><code>EmptyExtension</code></span></span><div class='docblock'><p>If an extension subtag is present, it must not be empty.</p>
</div><span id="variant.EmptyPrivateUse" class="variant small-section-header"><a href="#variant.EmptyPrivateUse" class="anchor field"></a><span id='EmptyPrivateUse.v' class='invisible'><code>EmptyPrivateUse</code></span></span><div class='docblock'><p>If the <code>x</code> subtag is present, it must not be empty.</p>
</div><span id="variant.ForbiddenChar" class="variant small-section-header"><a href="#variant.ForbiddenChar" class="anchor field"></a><span id='ForbiddenChar.v' class='invisible'><code>ForbiddenChar</code></span></span><div class='docblock'><p>The langtag contains a char that is not A-Z, a-z, 0-9 or the dash.</p>
</div><span id="variant.InvalidSubtag" class="variant small-section-header"><a href="#variant.InvalidSubtag" class="anchor field"></a><span id='InvalidSubtag.v' class='invisible'><code>InvalidSubtag</code></span></span><div class='docblock'><p>A subtag fails to parse, it does not match any other subtags.</p>
</div><span id="variant.InvalidLanguage" class="variant small-section-header"><a href="#variant.InvalidLanguage" class="anchor field"></a><span id='InvalidLanguage.v' class='invisible'><code>InvalidLanguage</code></span></span><div class='docblock'><p>The given language subtag is invalid.</p>
</div><span id="variant.SubtagTooLong" class="variant small-section-header"><a href="#variant.SubtagTooLong" class="anchor field"></a><span id='SubtagTooLong.v' class='invisible'><code>SubtagTooLong</code></span></span><div class='docblock'><p>A subtag may be eight characters in length at maximum.</p>
</div><span id="variant.TooManyExtlangs" class="variant small-section-header"><a href="#variant.TooManyExtlangs" class="anchor field"></a><span id='TooManyExtlangs.v' class='invisible'><code>TooManyExtlangs</code></span></span><div class='docblock'><p>At maximum three extlangs are allowed, but zero to one extlangs are preferred.</p>
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<h2 id='implementations' class='small-section-header'>
Trait Implementations<a href='#implementations' class='anchor'></a>
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<h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="enum" href="../language_tags/enum.Error.html" title="enum language_tags::Error">Error</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#78' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, __arg_0: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#78' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Eq' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="enum" href="../language_tags/enum.Error.html" title="enum language_tags::Error">Error</a></code><a href='#impl-Eq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#78' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'></div><h3 id='impl-PartialEq' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="enum" href="../language_tags/enum.Error.html" title="enum language_tags::Error">Error</a></code><a href='#impl-PartialEq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#78' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&amp;self, __arg_0: &amp;<a class="enum" href="../language_tags/enum.Error.html" title="enum language_tags::Error">Error</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#78' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>Rhs) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/cmp.rs.html#121' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 id='impl-ErrorTrait' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">ErrorTrait</a> for <a class="enum" href="../language_tags/enum.Error.html" title="enum language_tags::Error">Error</a></code><a href='#impl-ErrorTrait' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#98-111' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.description' class="method"><span id='description.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/std/error/trait.Error.html#tymethod.description' class='fnname'>description</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#99-110' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>A short description of the error. <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#tymethod.description">Read more</a></p>
</div><h4 id='method.cause' class="method"><span id='cause.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.cause' class='fnname'>cause</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;<a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/error.rs.html#154' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>The lower-level cause of this error, if any. <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.cause">Read more</a></p>
</div></div><h3 id='impl-Display' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="enum" href="../language_tags/enum.Error.html" title="enum language_tags::Error">Error</a></code><a href='#impl-Display' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#113-117' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt-1' class="method"><span id='fmt.v-1' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/language_tags/lib.rs.html#114-116' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
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