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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` struct in crate `futures`."><meta name="keywords" content="rust, rustlang, rust-lang, Error"><title>futures::io::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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc struct"><!--[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='../../futures/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><p class="location">Struct Error</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#implementations">Methods</a><div class="sidebar-links"><a href="#method.from_raw_os_error">from_raw_os_error</a><a href="#method.get_mut">get_mut</a><a href="#method.get_ref">get_ref</a><a href="#method.into_inner">into_inner</a><a href="#method.kind">kind</a><a href="#method.last_os_error">last_os_error</a><a href="#method.new">new</a><a href="#method.raw_os_error">raw_os_error</a></div><a class="sidebar-title" href="#trait-implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Display">Display</a><a href="#impl-Error">Error</a><a href="#impl-From%3CErrorKind%3E">From<ErrorKind></a><a href="#impl-From%3CIntoInnerError%3CW%3E%3E">From<IntoInnerError<W>></a><a href="#impl-From%3CNulError%3E">From<NulError></a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-RefUnwindSafe">!RefUnwindSafe</a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">!UnwindSafe</a></div><a class="sidebar-title" href="#blanket-implementations">Blanket Implementations</a><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow%3CT%3E">Borrow<T></a><a href="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-Into%3CU%3E">Into<U></a><a href="#impl-ToString">ToString</a><a href="#impl-TryFrom%3CU%3E">TryFrom<U></a><a href="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><p class="location"><a href="../index.html">futures</a>::<wbr><a href="index.html">io</a></p><div id="sidebar-vars" data-name="Error" data-ty="struct" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<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="in-band">Struct <a href="../index.html">futures</a>::<wbr><a href="index.html">io</a>::<wbr><a class="struct" href="">Error</a></span><span class="out-of-band"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span><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="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#58-60" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust struct">pub struct Error { /* fields omitted */ }</pre></div><div class="docblock"><p>The error type for I/O operations of the <a href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html"><code>Read</code></a>, <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html"><code>Write</code></a>, <a href="https://doc.rust-lang.org/nightly/std/io/trait.Seek.html"><code>Seek</code></a>, and
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associated traits.</p>
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<p>Errors mostly originate from the underlying OS, but custom instances of
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<code>Error</code> can be created with crafted error messages and a particular value of
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<a href="../../futures/io/enum.ErrorKind.html" title="ErrorKind"><code>ErrorKind</code></a>.</p>
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</div><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><h3 id="impl" class="impl"><code class="in-band">impl <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#231-517" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.new" class="method"><code>pub fn <a href="#method.new" class="fnname">new</a><E>(kind: <a class="enum" href="../../futures/io/enum.ErrorKind.html" title="enum futures::io::ErrorKind">ErrorKind</a>, error: E) -> <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a> <span class="where fmt-newline">where<br> E: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> + 'static + <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>, <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/alloc/struct.Global.html" title="struct alloc::alloc::Global">Global</a>>>, </span></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#251-253" title="goto source code">[src]</a></h4><div class="docblock"><p>Creates a new I/O error from a known kind of error as well as an
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arbitrary error payload.</p>
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<p>This function is used to generically create I/O errors which do not
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originate from the OS itself. The <code>error</code> argument is an arbitrary
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payload which will be contained in this <a href="../../futures/io/struct.Error.html" title="Error"><code>Error</code></a>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Error</span>, <span class="ident">ErrorKind</span>};
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<span class="comment">// errors can be created from strings</span>
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<span class="kw">let</span> <span class="ident">custom_error</span> <span class="op">=</span> <span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="string">"oh no!"</span>);
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<span class="comment">// errors can also be created from other errors</span>
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<span class="kw">let</span> <span class="ident">custom_error2</span> <span class="op">=</span> <span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">ErrorKind</span>::<span class="ident">Interrupted</span>, <span class="ident">custom_error</span>);</pre></div>
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</div><h4 id="method.last_os_error" class="method"><code>pub fn <a href="#method.last_os_error" class="fnname">last_os_error</a>() -> <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#276" title="goto source code">[src]</a></h4><div class="docblock"><p>Returns an error representing the last OS error which occurred.</p>
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<p>This function reads the value of <code>errno</code> for the target platform (e.g.
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<code>GetLastError</code> on Windows) and will return a corresponding instance of
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<a href="../../futures/io/struct.Error.html" title="Error"><code>Error</code></a> for the error code.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Error</span>;
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"last OS error: {:?}"</span>, <span class="ident">Error</span>::<span class="ident">last_os_error</span>());</pre></div>
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</div><h4 id="method.from_raw_os_error" class="method"><code>pub fn <a href="#method.from_raw_os_error" class="fnname">from_raw_os_error</a>(code: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -> <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#306" title="goto source code">[src]</a></h4><div class="docblock"><p>Creates a new instance of an <a href="../../futures/io/struct.Error.html" title="Error"><code>Error</code></a> from a particular OS error code.</p>
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<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
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<p>On Linux:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
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<span class="kw">let</span> <span class="ident">error</span> <span class="op">=</span> <span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">from_raw_os_error</span>(<span class="number">22</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">error</span>.<span class="ident">kind</span>(), <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidInput</span>);</pre></div>
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<p>On Windows:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
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<span class="kw">let</span> <span class="ident">error</span> <span class="op">=</span> <span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">from_raw_os_error</span>(<span class="number">10022</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">error</span>.<span class="ident">kind</span>(), <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidInput</span>);</pre></div>
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</div><h4 id="method.raw_os_error" class="method"><code>pub fn <a href="#method.raw_os_error" class="fnname">raw_os_error</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#340" title="goto source code">[src]</a></h4><div class="docblock"><p>Returns the OS error that this error represents (if any).</p>
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<p>If this <a href="../../futures/io/struct.Error.html" title="Error"><code>Error</code></a> was constructed via <a href="../../futures/io/struct.Error.html#method.last_os_error"><code>last_os_error</code></a> or
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<a href="../../futures/io/struct.Error.html#method.from_raw_os_error"><code>from_raw_os_error</code></a>, then this function will return <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.Some" title="Some"><code>Some</code></a>, otherwise
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it will return <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.None" title="None"><code>None</code></a>.</p>
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<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Error</span>, <span class="ident">ErrorKind</span>};
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<span class="kw">fn</span> <span class="ident">print_os_error</span>(<span class="ident">err</span>: <span class="kw-2">&</span><span class="ident">Error</span>) {
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<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">raw_os_err</span>) <span class="op">=</span> <span class="ident">err</span>.<span class="ident">raw_os_error</span>() {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"raw OS error: {:?}"</span>, <span class="ident">raw_os_err</span>);
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} <span class="kw">else</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Not an OS error"</span>);
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}
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}
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="comment">// Will print "raw OS error: ...".</span>
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<span class="ident">print_os_error</span>(<span class="kw-2">&</span><span class="ident">Error</span>::<span class="ident">last_os_error</span>());
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<span class="comment">// Will print "Not an OS error".</span>
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<span class="ident">print_os_error</span>(<span class="kw-2">&</span><span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="string">"oh no!"</span>));
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}</pre></div>
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</div><h4 id="method.get_ref" class="method"><code>pub fn <a href="#method.get_ref" class="fnname">get_ref</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&(dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> + 'static + <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>)></code><span class="since" title="Stable since Rust version 1.3.0">1.3.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#376" title="goto source code">[src]</a></h4><div class="docblock"><p>Returns a reference to the inner error wrapped by this error (if any).</p>
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<p>If this <a href="../../futures/io/struct.Error.html" title="Error"><code>Error</code></a> was constructed via <a href="../../futures/io/struct.Error.html#method.new"><code>new</code></a> then this function will
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return <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.Some" title="Some"><code>Some</code></a>, otherwise it will return <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.None" title="None"><code>None</code></a>.</p>
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<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Error</span>, <span class="ident">ErrorKind</span>};
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<span class="kw">fn</span> <span class="ident">print_error</span>(<span class="ident">err</span>: <span class="kw-2">&</span><span class="ident">Error</span>) {
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<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">inner_err</span>) <span class="op">=</span> <span class="ident">err</span>.<span class="ident">get_ref</span>() {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Inner error: {:?}"</span>, <span class="ident">inner_err</span>);
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} <span class="kw">else</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"No inner error"</span>);
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}
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}
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="comment">// Will print "No inner error".</span>
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<span class="ident">print_error</span>(<span class="kw-2">&</span><span class="ident">Error</span>::<span class="ident">last_os_error</span>());
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<span class="comment">// Will print "Inner error: ...".</span>
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<span class="ident">print_error</span>(<span class="kw-2">&</span><span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="string">"oh no!"</span>));
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}</pre></div>
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</div><h4 id="method.get_mut" class="method"><code>pub fn <a href="#method.get_mut" class="fnname">get_mut</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&mut (dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> + 'static + <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>)></code><span class="since" title="Stable since Rust version 1.3.0">1.3.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#447" title="goto source code">[src]</a></h4><div class="docblock"><p>Returns a mutable reference to the inner error wrapped by this error
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(if any).</p>
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<p>If this <a href="../../futures/io/struct.Error.html" title="Error"><code>Error</code></a> was constructed via <a href="../../futures/io/struct.Error.html#method.new"><code>new</code></a> then this function will
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return <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.Some" title="Some"><code>Some</code></a>, otherwise it will return <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.None" title="None"><code>None</code></a>.</p>
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<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Error</span>, <span class="ident">ErrorKind</span>};
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<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">error</span>, <span class="ident">fmt</span>};
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>::<span class="ident">Display</span>;
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
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<span class="kw">struct</span> <span class="ident">MyError</span> {
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<span class="ident">v</span>: <span class="ident">String</span>,
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}
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<span class="kw">impl</span> <span class="ident">MyError</span> {
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<span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">MyError</span> {
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<span class="ident">MyError</span> {
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<span class="ident">v</span>: <span class="string">"oh no!"</span>.<span class="ident">to_string</span>()
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}
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}
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<span class="kw">fn</span> <span class="ident">change_message</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">new_message</span>: <span class="kw-2">&</span><span class="ident">str</span>) {
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<span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">new_message</span>.<span class="ident">to_string</span>();
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}
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}
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<span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">MyError</span> {}
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<span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">MyError</span> {
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<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"MyError: {}"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">change_error</span>(<span class="kw-2">mut</span> <span class="ident">err</span>: <span class="ident">Error</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Error</span> {
|
||
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">inner_err</span>) <span class="op">=</span> <span class="ident">err</span>.<span class="ident">get_mut</span>() {
|
||
<span class="ident">inner_err</span>.<span class="ident">downcast_mut</span>::<span class="op"><</span><span class="ident">MyError</span><span class="op">></span>().<span class="ident">unwrap</span>().<span class="ident">change_message</span>(<span class="string">"I've been changed!"</span>);
|
||
}
|
||
<span class="ident">err</span>
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">print_error</span>(<span class="ident">err</span>: <span class="kw-2">&</span><span class="ident">Error</span>) {
|
||
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">inner_err</span>) <span class="op">=</span> <span class="ident">err</span>.<span class="ident">get_ref</span>() {
|
||
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Inner error: {}"</span>, <span class="ident">inner_err</span>);
|
||
} <span class="kw">else</span> {
|
||
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"No inner error"</span>);
|
||
}
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">main</span>() {
|
||
<span class="comment">// Will print "No inner error".</span>
|
||
<span class="ident">print_error</span>(<span class="kw-2">&</span><span class="ident">change_error</span>(<span class="ident">Error</span>::<span class="ident">last_os_error</span>()));
|
||
<span class="comment">// Will print "Inner error: ...".</span>
|
||
<span class="ident">print_error</span>(<span class="kw-2">&</span><span class="ident">change_error</span>(<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="ident">MyError</span>::<span class="ident">new</span>())));
|
||
}</pre></div>
|
||
</div><h4 id="method.into_inner" class="method"><code>pub fn <a href="#method.into_inner" class="fnname">into_inner</a>(<br> self<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> + 'static + <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>, <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/alloc/struct.Global.html" title="struct alloc::alloc::Global">Global</a>>></code><span class="since" title="Stable since Rust version 1.3.0">1.3.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#483" title="goto source code">[src]</a></h4><div class="docblock"><p>Consumes the <code>Error</code>, returning its inner error (if any).</p>
|
||
<p>If this <a href="../../futures/io/struct.Error.html" title="Error"><code>Error</code></a> was constructed via <a href="../../futures/io/struct.Error.html#method.new"><code>new</code></a> then this function will
|
||
return <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.Some" title="Some"><code>Some</code></a>, otherwise it will return <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.None" title="None"><code>None</code></a>.</p>
|
||
<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered">
|
||
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Error</span>, <span class="ident">ErrorKind</span>};
|
||
|
||
<span class="kw">fn</span> <span class="ident">print_error</span>(<span class="ident">err</span>: <span class="ident">Error</span>) {
|
||
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">inner_err</span>) <span class="op">=</span> <span class="ident">err</span>.<span class="ident">into_inner</span>() {
|
||
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Inner error: {}"</span>, <span class="ident">inner_err</span>);
|
||
} <span class="kw">else</span> {
|
||
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"No inner error"</span>);
|
||
}
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">main</span>() {
|
||
<span class="comment">// Will print "No inner error".</span>
|
||
<span class="ident">print_error</span>(<span class="ident">Error</span>::<span class="ident">last_os_error</span>());
|
||
<span class="comment">// Will print "Inner error: ...".</span>
|
||
<span class="ident">print_error</span>(<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="string">"oh no!"</span>));
|
||
}</pre></div>
|
||
</div><h4 id="method.kind" class="method"><code>pub fn <a href="#method.kind" class="fnname">kind</a>(&self) -> <a class="enum" href="../../futures/io/enum.ErrorKind.html" title="enum futures::io::ErrorKind">ErrorKind</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#510" title="goto source code">[src]</a></h4><div class="docblock"><p>Returns the corresponding <a href="../../futures/io/enum.ErrorKind.html" title="ErrorKind"><code>ErrorKind</code></a> for this error.</p>
|
||
<h1 id="examples-7" class="section-header"><a href="#examples-7">Examples</a></h1>
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered">
|
||
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Error</span>, <span class="ident">ErrorKind</span>};
|
||
|
||
<span class="kw">fn</span> <span class="ident">print_error</span>(<span class="ident">err</span>: <span class="ident">Error</span>) {
|
||
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">err</span>.<span class="ident">kind</span>());
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">main</span>() {
|
||
<span class="comment">// Will print "Other".</span>
|
||
<span class="ident">print_error</span>(<span class="ident">Error</span>::<span class="ident">last_os_error</span>());
|
||
<span class="comment">// Will print "AddrInUse".</span>
|
||
<span class="ident">print_error</span>(<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">ErrorKind</span>::<span class="ident">AddrInUse</span>, <span class="string">"oh no!"</span>));
|
||
}</pre></div>
|
||
</div></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><h3 id="impl-Debug" class="impl"><code class="in-band">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="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-Debug" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#63-67" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.fmt-1" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt" class="fnname">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#64" title="goto source code">[src]</a></h4><div class='docblock hidden'><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-Display" class="impl"><code class="in-band">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="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-Display" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#535-546" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.fmt" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt" class="fnname">fmt</a>(&self, fmt: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#536" title="goto source code">[src]</a></h4><div class='docblock hidden'><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>
|
||
</div></div><h3 id="impl-Error" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-Error" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#549-574" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.description" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.description" class="fnname">description</a>(&self) -> &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#551" title="goto source code">[src]</a></h4><div class="item-info hidden"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 1.42.0: <p>use the Display impl or to_string()</p>
|
||
</div></div><div class='docblock hidden'> <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.description">Read more</a></div><h4 id="method.cause" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.cause" class="fnname">cause</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#559" title="goto source code">[src]</a></h4><div class="item-info hidden"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 1.33.0: <p>replaced by Error::source, which can support downcasting</p>
|
||
</div></div><h4 id="method.source" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.source" class="fnname">source</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&(dyn <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> + 'static)></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#567" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>The lower-level source of this error, if any. <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.source">Read more</a></p>
|
||
</div><h4 id="method.backtrace" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.backtrace" class="fnname">backtrace</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&<a class="struct" href="https://doc.rust-lang.org/nightly/std/backtrace/struct.Backtrace.html" title="struct std::backtrace::Backtrace">Backtrace</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/error.rs.html#126" title="goto source code">[src]</a></h4><div class="item-info hidden"><div class="stab unstable"><span class="emoji">🔬</span> This is a nightly-only experimental API. (<code>backtrace</code>)</div></div><div class='docblock hidden'><p>Returns a stack backtrace, if available, of where this error occurred. <a href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.backtrace">Read more</a></p>
|
||
</div></div><h3 id="impl-From%3CErrorKind%3E" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="enum" href="../../futures/io/enum.ErrorKind.html" title="enum futures::io::ErrorKind">ErrorKind</a>> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-From%3CErrorKind%3E" class="anchor"></a><span class="since" title="Stable since Rust version 1.14.0">1.14.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#211-229" title="goto source code">[src]</a></h3><div class="docblock"><p>Intended for use for errors not exposed to the user, where allocating onto
|
||
the heap (for normal construction via Error::new) is too costly.</p>
|
||
</div><div class="impl-items"><h4 id="method.from" class="method"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(kind: <a class="enum" href="../../futures/io/enum.ErrorKind.html" title="enum futures::io::ErrorKind">ErrorKind</a>) -> <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/error.rs.html#226" title="goto source code">[src]</a></h4><div class="docblock"><p>Converts an <a href="../../futures/io/enum.ErrorKind.html" title="ErrorKind"><code>ErrorKind</code></a> into an <a href="../../futures/io/struct.Error.html" title="Error"><code>Error</code></a>.</p>
|
||
<p>This conversion allocates a new error with a simple representation of error kind.</p>
|
||
<h1 id="examples-8" class="section-header"><a href="#examples-8">Examples</a></h1>
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered">
|
||
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Error</span>, <span class="ident">ErrorKind</span>};
|
||
|
||
<span class="kw">let</span> <span class="ident">not_found</span> <span class="op">=</span> <span class="ident">ErrorKind</span>::<span class="ident">NotFound</span>;
|
||
<span class="kw">let</span> <span class="ident">error</span> <span class="op">=</span> <span class="ident">Error</span>::<span class="ident">from</span>(<span class="ident">not_found</span>);
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"entity not found"</span>, <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">error</span>));</pre></div>
|
||
</div></div><h3 id="impl-From%3CIntoInnerError%3CW%3E%3E" class="impl"><code class="in-band">impl<W> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="struct" href="https://doc.rust-lang.org/nightly/std/io/buffered/struct.IntoInnerError.html" title="struct std::io::buffered::IntoInnerError">IntoInnerError</a><W>> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-From%3CIntoInnerError%3CW%3E%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/buffered/mod.rs.html#177-181" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from-1" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(iie: <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/buffered/struct.IntoInnerError.html" title="struct std::io::buffered::IntoInnerError">IntoInnerError</a><W>) -> <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/io/buffered/mod.rs.html#178" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
|
||
</div></div><h3 id="impl-From%3CNulError%3E" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="struct" href="https://doc.rust-lang.org/nightly/std/ffi/c_str/struct.NulError.html" title="struct std::ffi::c_str::NulError">NulError</a>> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-From%3CNulError%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/ffi/c_str.rs.html#1038-1043" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from-2" class="method"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(<a class="struct" href="https://doc.rust-lang.org/nightly/std/ffi/c_str/struct.NulError.html" title="struct std::ffi::c_str::NulError">NulError</a>) -> <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/ffi/c_str.rs.html#1040" title="goto source code">[src]</a></h4><div class="docblock"><p>Converts a <a href="https://doc.rust-lang.org/nightly/std/ffi/c_str/struct.NulError.html" title="NulError"><code>NulError</code></a> into a <a href="../../futures/io/struct.Error.html" title="io::Error"><code>io::Error</code></a>.</p>
|
||
</div></div></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><h3 id="impl-RefUnwindSafe" class="impl"><code class="in-band">impl !<a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.RefUnwindSafe.html" title="trait std::panic::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-RefUnwindSafe" class="anchor"></a><a class="srclink" href="../../src/futures/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Send" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-Send" class="anchor"></a><a class="srclink" href="../../src/futures/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Sync" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-Sync" class="anchor"></a><a class="srclink" href="../../src/futures/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Unpin" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-Unpin" class="anchor"></a><a class="srclink" href="../../src/futures/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-UnwindSafe" class="impl"><code class="in-band">impl !<a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a> for <a class="struct" href="../../futures/io/struct.Error.html" title="struct futures::io::Error">Error</a></code><a href="#impl-UnwindSafe" class="anchor"></a><a class="srclink" href="../../src/futures/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><h3 id="impl-Any" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br> T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-Any" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#131-135" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.type_id" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#132" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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</div></div><h3 id="impl-Borrow%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-Borrow%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#207-211" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T<span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<div class="notable-traits-tooltiptext"><span class="docblock"><h3 class="notable">Notable traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F</h3><code class="content"><span class="where fmt-newline">impl<'_, F> <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> + <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href="../../futures/future/trait.Future.html#associatedtype.Output" class="type">Output</a> = <F as <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a>>::<a class="type" href="../../futures/future/trait.Future.html#associatedtype.Output" title="type futures::future::Future::Output">Output</a>;</span></code></span></div></span></span></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#208" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
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</div></div><h3 id="impl-BorrowMut%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-BorrowMut%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214-218" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow_mut" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T<span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<div class="notable-traits-tooltiptext"><span class="docblock"><h3 class="notable">Notable traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F</h3><code class="content"><span class="where fmt-newline">impl<'_, F> <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> + <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href="../../futures/future/trait.Future.html#associatedtype.Output" class="type">Output</a> = <F as <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a>>::<a class="type" href="../../futures/future/trait.Future.html#associatedtype.Output" title="type futures::future::Future::Output">Output</a>;</span></code></span></div></span></span></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#215" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
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</div></div><h3 id="impl-From%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</code><a href="#impl-From%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#545-549" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from-3" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#546" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-Into%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>, </span></code><a href="#impl-Into%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#534-541" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> U</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#538" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-ToString" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html" title="trait alloc::string::ToString">ToString</a> for T <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> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-ToString" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#2203-2216" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.to_string" class="method hidden"><code>pub default fn <a href="https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html#tymethod.to_string" class="fnname">to_string</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#2209" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Converts the given value to a <code>String</code>. <a href="https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html#tymethod.to_string">Read more</a></p>
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</div></div><h3 id="impl-TryFrom%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>, </span></code><a href="#impl-TryFrom%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#582-591" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="type">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id="method.try_from" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#588" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-TryInto%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><a href="#impl-TryInto%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#568-577" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error-1" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="type">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id="method.try_into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#574" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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