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<p class='location'>Trait ResultExt</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.compat">compat</a><a href="#tymethod.context">context</a><a href="#tymethod.with_context">with_context</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-ResultExt%3CT%2C%20E%3E">Result<T, E></a><a href="#impl-ResultExt%3CT%2C%20Error%3E">Result<T, Error></a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>failure</a></p><script>window.sidebarCurrent = {name: 'ResultExt', 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'>failure</a>::<wbr><a class="trait" href=''>ResultExt</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/failure/result_ext.rs.html#6-150' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait ResultExt<T, E> {
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fn <a href='#tymethod.compat' class='fnname'>compat</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Compat.html" title="struct failure::Compat">Compat</a><E>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.context' class='fnname'>context</a><D>(self, context: D) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>><br> <span class="where">where<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static</span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.with_context' class='fnname'>with_context</a><F, D>(self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>E) -> D,<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static</span>;
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}</pre><div class='docblock'><p>Extension methods for <code>Result</code>.</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.compat' class='method'><span id='compat.v' class='invisible'><code>fn <a href='#tymethod.compat' class='fnname'>compat</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Compat.html" title="struct failure::Compat">Compat</a><E>></code></span></h3><div class='docblock'><p>Wraps the error in <code>Compat</code> to make it compatible with older error
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handling APIs that expect <code>std::error::Error</code>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
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<span class="kw">struct</span> <span class="ident">CustomError</span>;
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<span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">CustomError</span> {
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<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
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<span class="string">"My custom error message"</span>
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}
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<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">None</span>
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}
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}
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> (<span class="op">||</span> <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">failure</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="ident">CustomError</span>).<span class="ident">compat</span>()<span class="question-mark">?</span>
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})().<span class="ident">with_context</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> {
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<span class="macro">format</span><span class="macro">!</span>(<span class="string">"An error occured: {}"</span>, <span class="ident">e</span>)
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}).<span class="ident">unwrap_err</span>();
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="string">"An error occured: My custom error message"</span>);
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</pre>
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</div><h3 id='tymethod.context' class='method'><span id='context.v' class='invisible'><code>fn <a href='#tymethod.context' class='fnname'>context</a><D>(self, context: D) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></span></h3><div class='docblock'><p>Wraps the error type in a context type.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Fail</span>, <span class="ident">Debug</span>)]</span>
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<span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">""</span>)]</span>
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<span class="kw">struct</span> <span class="ident">CustomError</span>;
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> (<span class="op">||</span> <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">failure</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="ident">CustomError</span>)<span class="question-mark">?</span>
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})().<span class="ident">context</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"An error occured"</span>)).<span class="ident">unwrap_err</span>();
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="string">"An error occured"</span>);
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</pre>
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</div><h3 id='tymethod.with_context' class='method'><span id='with_context.v' class='invisible'><code>fn <a href='#tymethod.with_context' class='fnname'>with_context</a><F, D>(self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>E) -> D,<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></span></h3><div class='docblock'><p>Wraps the error type in a context type generated by looking at the
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error value.</p>
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<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Fail</span>, <span class="ident">Debug</span>)]</span>
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<span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">"My custom error message"</span>)]</span>
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<span class="kw">struct</span> <span class="ident">CustomError</span>;
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||
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> (<span class="op">||</span> <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">failure</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="ident">CustomError</span>)<span class="question-mark">?</span>
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})().<span class="ident">with_context</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> {
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<span class="macro">format</span><span class="macro">!</span>(<span class="string">"An error occured: {}"</span>, <span class="ident">e</span>)
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}).<span class="ident">unwrap_err</span>();
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="string">"An error occured: My custom error message"</span>);
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</pre>
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</div></div>
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<h2 id='foreign-impls' class='small-section-header'>
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Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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</h2>
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<h3 id='impl-ResultExt%3CT%2C%20E%3E' class='impl'><span class='in-band'><code>impl<T, E> <a class="trait" href="../failure/trait.ResultExt.html" title="trait failure::ResultExt">ResultExt</a><T, E> for <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, E> <span class="where fmt-newline">where<br> E: <a class="trait" href="../failure/trait.Fail.html" title="trait failure::Fail">Fail</a>, </span></code><a href='#impl-ResultExt%3CT%2C%20E%3E' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/result_ext.rs.html#152-177' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='method.compat' class="method"><span id='compat.v-1' class='invisible'><code>fn <a href='#method.compat' class='fnname'>compat</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Compat.html" title="struct failure::Compat">Compat</a><E>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/result_ext.rs.html#156-158' title='goto source code'>[src]</a></span></h4>
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<h4 id='method.context' class="method"><span id='context.v-1' class='invisible'><code>fn <a href='#method.context' class='fnname'>context</a><D>(self, context: D) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/result_ext.rs.html#160-165' title='goto source code'>[src]</a></span></h4>
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<h4 id='method.with_context' class="method"><span id='with_context.v-1' class='invisible'><code>fn <a href='#method.with_context' class='fnname'>with_context</a><F, D>(self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>E) -> D,<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/result_ext.rs.html#167-176' title='goto source code'>[src]</a></span></h4>
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||
</div></span><h3 id='impl-ResultExt%3CT%2C%20Error%3E' class='impl'><span class='in-band'><code>impl<T> <a class="trait" href="../failure/trait.ResultExt.html" title="trait failure::ResultExt">ResultExt</a><T, <a class="struct" href="../failure/struct.Error.html" title="struct failure::Error">Error</a>> for <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Error.html" title="struct failure::Error">Error</a>></code><a href='#impl-ResultExt%3CT%2C%20Error%3E' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/result_ext.rs.html#182-202' title='goto source code'>[src]</a></span></h3>
|
||
<span class='docblock autohide'><div class='impl-items'><h4 id='method.compat-1' class="method"><span id='compat.v-2' class='invisible'><code>fn <a href='#method.compat' class='fnname'>compat</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Compat.html" title="struct failure::Compat">Compat</a><<a class="struct" href="../failure/struct.Error.html" title="struct failure::Error">Error</a>>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/result_ext.rs.html#183-185' title='goto source code'>[src]</a></span></h4>
|
||
<h4 id='method.context-1' class="method"><span id='context.v-2' class='invisible'><code>fn <a href='#method.context' class='fnname'>context</a><D>(self, context: D) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/result_ext.rs.html#187-191' title='goto source code'>[src]</a></span></h4>
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