| <!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="The `Error` type, a wrapper around a dynamic error type."><meta name="keywords" content="rust, rustlang, rust-lang, Error"><title>Error in anyhow - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" 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class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../anyhow/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Error</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block"><li><a href="#method.backtrace">backtrace</a></li><li><a href="#method.chain">chain</a></li><li><a href="#method.context">context</a></li><li><a href="#method.downcast">downcast</a></li><li><a href="#method.downcast_mut">downcast_mut</a></li><li><a href="#method.downcast_ref">downcast_ref</a></li><li><a href="#method.is">is</a></li><li><a href="#method.msg">msg</a></li><li><a href="#method.new">new</a></li><li><a href="#method.root_cause">root_cause</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-AsRef%3Cdyn%20Error%20+%20%27static%3E-for-Error">AsRef<dyn Error + 'static></a></li><li><a href="#impl-AsRef%3Cdyn%20Error%20+%20Sync%20+%20Send%20+%20%27static%3E-for-Error">AsRef<dyn Error + Sync + Send + 'static></a></li><li><a href="#impl-Debug-for-Error">Debug</a></li><li><a href="#impl-Deref-for-Error">Deref</a></li><li><a href="#impl-DerefMut-for-Error">DerefMut</a></li><li><a href="#impl-Display-for-Error">Display</a></li><li><a href="#impl-Drop-for-Error">Drop</a></li><li><a href="#impl-From%3CE%3E-for-Error">From<E></a></li><li><a href="#impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20%27static%3E">From<Error></a></li><li><a href="#impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20Send%20+%20%27static%3E">From<Error></a></li><li><a href="#impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20Send%20+%20Sync%20+%20%27static%3E">From<Error></a></li><li><a href="#impl-Provider-for-Error">Provider</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block"><li><a href="#impl-RefUnwindSafe-for-Error">!RefUnwindSafe</a></li><li><a href="#impl-Send-for-Error">Send</a></li><li><a href="#impl-Sync-for-Error">Sync</a></li><li><a href="#impl-Unpin-for-Error">Unpin</a></li><li><a href="#impl-UnwindSafe-for-Error">!UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-Error">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-Error">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-Error">BorrowMut<T></a></li><li><a href="#impl-From%3C!%3E-for-Error">From<!></a></li><li><a href="#impl-From%3CT%3E-for-Error">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-Error">Into<U></a></li><li><a href="#impl-ToString-for-Error">ToString</a></li><li><a href="#impl-TryFrom%3CU%3E-for-Error">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-Error">TryInto<U></a></li></ul></section><h2><a href="index.html">In anyhow</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Struct <a href="index.html">anyhow</a>::<wbr><a class="struct" href="#">Error</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../src/anyhow/lib.rs.html#374-376">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust struct"><code>pub struct Error { /* private fields */ }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>The <code>Error</code> type, a wrapper around a dynamic error type.</p> |
| <p><code>Error</code> works a lot like <code>Box<dyn std::error::Error></code>, but with these |
| differences:</p> |
| <ul> |
| <li><code>Error</code> requires that the error is <code>Send</code>, <code>Sync</code>, and <code>'static</code>.</li> |
| <li><code>Error</code> guarantees that a backtrace is available, even if the underlying |
| error type does not provide one.</li> |
| <li><code>Error</code> is represented as a narrow pointer — exactly one word in |
| size instead of two.</li> |
| </ul> |
| <br> |
| <h2 id="display-representations"><a href="#display-representations">Display representations</a></h2> |
| <p>When you print an error object using “{}” or to_string(), only the outermost |
| underlying error or context is printed, not any of the lower level causes. |
| This is exactly as if you had called the Display impl of the error from |
| which you constructed your anyhow::Error.</p> |
| <div class="example-wrap"><pre class="language-console"><code>Failed to read instrs from ./path/to/instrs.json</code></pre></div> |
| <p>To print causes as well using anyhow’s default formatting of causes, use the |
| alternate selector “{:#}”.</p> |
| <div class="example-wrap"><pre class="language-console"><code>Failed to read instrs from ./path/to/instrs.json: No such file or directory (os error 2)</code></pre></div> |
| <p>The Debug format “{:?}” includes your backtrace if one was captured. Note |
| that this is the representation you get by default if you return an error |
| from <code>fn main</code> instead of printing it explicitly yourself.</p> |
| <div class="example-wrap"><pre class="language-console"><code>Error: Failed to read instrs from ./path/to/instrs.json |
| |
| Caused by: |
| No such file or directory (os error 2)</code></pre></div> |
| <p>and if there is a backtrace available:</p> |
| <div class="example-wrap"><pre class="language-console"><code>Error: Failed to read instrs from ./path/to/instrs.json |
| |
| Caused by: |
| No such file or directory (os error 2) |
| |
| Stack backtrace: |
| 0: <E as anyhow::context::ext::StdError>::ext_context |
| at /git/anyhow/src/backtrace.rs:26 |
| 1: core::result::Result<T,E>::map_err |
| at /git/rustc/src/libcore/result.rs:596 |
| 2: anyhow::context::<impl anyhow::Context<T,E> for core::result::Result<T,E>>::with_context |
| at /git/anyhow/src/context.rs:58 |
| 3: testing::main |
| at src/main.rs:5 |
| 4: std::rt::lang_start |
| at /git/rustc/src/libstd/rt.rs:61 |
| 5: main |
| 6: __libc_start_main |
| 7: _start</code></pre></div> |
| <p>To see a conventional struct-style Debug representation, use “{:#?}”.</p> |
| <div class="example-wrap"><pre class="language-console"><code>Error { |
| context: "Failed to read instrs from ./path/to/instrs.json", |
| source: Os { |
| code: 2, |
| kind: NotFound, |
| message: "No such file or directory", |
| }, |
| }</code></pre></div> |
| <p>If none of the built-in representations are appropriate and you would prefer |
| to render the error and its cause chain yourself, it can be done something |
| like this:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>anyhow::{Context, <span class="prelude-ty">Result</span>}; |
| |
| <span class="kw">fn </span>main() { |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(err) = try_main() { |
| <span class="macro">eprintln!</span>(<span class="string">"ERROR: {}"</span>, err); |
| err.chain().skip(<span class="number">1</span>).for_each(|cause| <span class="macro">eprintln!</span>(<span class="string">"because: {}"</span>, cause)); |
| std::process::exit(<span class="number">1</span>); |
| } |
| } |
| |
| <span class="kw">fn </span>try_main() -> <span class="prelude-ty">Result</span><()> { |
| ... |
| }</code></pre></div> |
| </div></details><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><div id="implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#20-525">source</a><a href="#impl-Error" class="anchor"></a><h3 class="code-header">impl <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.new" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#32-38">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fnname">new</a><E>(error: E) -> Self<span class="where fmt-newline">where<br> E: <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">StdError</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></h4></section></summary><div class="docblock"><p>Create a new error object from any error type.</p> |
| <p>The error type must be threadsafe and <code>'static</code>, so that the <code>Error</code> |
| will be as well.</p> |
| <p>If the error type does not provide a backtrace, a backtrace will be |
| created here to ensure that a backtrace exists.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.msg" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#79-84">source</a><h4 class="code-header">pub fn <a href="#method.msg" class="fnname">msg</a><M>(message: M) -> Self<span class="where fmt-newline">where<br> M: <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/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</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></h4></section></summary><div class="docblock"><p>Create a new error object from a printable error message.</p> |
| <p>If the argument implements std::error::Error, prefer <code>Error::new</code> |
| instead which preserves the underlying error’s cause chain and |
| backtrace. If the argument may or may not implement std::error::Error |
| now or in the future, use <code>anyhow!(err)</code> which handles either way |
| correctly.</p> |
| <p><code>Error::msg("...")</code> is equivalent to <code>anyhow!("...")</code> but occasionally |
| convenient in places where a function is preferable over a macro, such |
| as iterator or stream combinators:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>anyhow::{Error, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span>futures::stream::{Stream, StreamExt, TryStreamExt}; |
| |
| <span class="kw">async fn </span>demo<S>(stream: S) -> <span class="prelude-ty">Result</span><Vec<Output>> |
| <span class="kw">where |
| </span>S: Stream<Item = Input>, |
| { |
| stream |
| .then(ffi::do_some_work) <span class="comment">// returns Result<Output, &str> |
| </span>.map_err(Error::msg) |
| .try_collect() |
| .<span class="kw">await |
| </span>}</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.context" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#301-329">source</a><h4 class="code-header">pub fn <a href="#method.context" class="fnname">context</a><C>(self, context: C) -> Self<span class="where fmt-newline">where<br> C: <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></h4></section></summary><div class="docblock"><p>Wrap the error value with additional context.</p> |
| <p>For attaching context to a <code>Result</code> as it is propagated, the |
| <a href="trait.Context.html" title="crate::Context"><code>Context</code></a> extension trait may be more convenient than |
| this function.</p> |
| <p>The primary reason to use <code>error.context(...)</code> instead of |
| <code>result.context(...)</code> via the <code>Context</code> trait would be if the context |
| needs to depend on some data held by the underlying error:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>anyhow::Result; |
| <span class="kw">use </span>std::fs::File; |
| <span class="kw">use </span>std::path::Path; |
| |
| <span class="kw">struct </span>ParseError { |
| line: usize, |
| column: usize, |
| } |
| |
| <span class="kw">fn </span>parse_impl(file: File) -> <span class="prelude-ty">Result</span><T, ParseError> { |
| ... |
| } |
| |
| <span class="kw">pub fn </span>parse(path: <span class="kw">impl </span>AsRef<Path>) -> <span class="prelude-ty">Result</span><T> { |
| <span class="kw">let </span>file = File::open(<span class="kw-2">&</span>path)<span class="question-mark">?</span>; |
| parse_impl(file).map_err(|error| { |
| <span class="kw">let </span>context = <span class="macro">format!</span>( |
| <span class="string">"only the first {} lines of {} are valid"</span>, |
| error.line, path.as_ref().display(), |
| ); |
| anyhow::Error::new(error).context(context) |
| }) |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.backtrace" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#363-365">source</a><h4 class="code-header">pub fn <a href="#method.backtrace" class="fnname">backtrace</a>(&self) -> &<a class="struct" href="https://doc.rust-lang.org/nightly/std/backtrace/struct.Backtrace.html" title="struct std::backtrace::Backtrace">Backtrace</a></h4></section></summary><div class="docblock"><p>Get the backtrace for this Error.</p> |
| <p>In order for the backtrace to be meaningful, one of the two environment |
| variables <code>RUST_LIB_BACKTRACE=1</code> or <code>RUST_BACKTRACE=1</code> must be defined |
| and <code>RUST_LIB_BACKTRACE</code> must not be <code>0</code>. Backtraces are somewhat |
| expensive to capture in Rust, so we don’t necessarily want to be |
| capturing them all over the place all the time.</p> |
| <ul> |
| <li>If you want panics and errors to both have backtraces, set |
| <code>RUST_BACKTRACE=1</code>;</li> |
| <li>If you want only errors to have backtraces, set |
| <code>RUST_LIB_BACKTRACE=1</code>;</li> |
| <li>If you want only panics to have backtraces, set <code>RUST_BACKTRACE=1</code> and |
| <code>RUST_LIB_BACKTRACE=0</code>.</li> |
| </ul> |
| <h5 id="stability"><a href="#stability">Stability</a></h5> |
| <p>Standard library backtraces are only available on the nightly channel. |
| Tracking issue: <a href="https://github.com/rust-lang/rust/issues/53487">rust-lang/rust#53487</a>.</p> |
| <p>On stable compilers, this function is only available if the crate’s |
| “backtrace” feature is enabled, and will use the <code>backtrace</code> crate as |
| the underlying backtrace implementation.</p> |
| <div class="example-wrap"><pre class="language-toml"><code>[dependencies] |
| anyhow = { version = "1.0", features = ["backtrace"] }</code></pre></div></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.chain" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#391-393">source</a><h4 class="code-header">pub fn <a href="#method.chain" class="fnname">chain</a>(&self) -> <a class="struct" href="struct.Chain.html" title="struct anyhow::Chain">Chain</a><'_><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.Chain.html" title="struct anyhow::Chain">Chain</a><'a></span><code class="content"><span class="where fmt-newline">impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a> for <a class="struct" href="struct.Chain.html" title="struct anyhow::Chain">Chain</a><'a></span><span class="where fmt-newline"> type <a href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" class="associatedtype">Item</a> = &'a (dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + 'static);</span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>An iterator of the chain of source errors contained by this Error.</p> |
| <p>This iterator will visit every error in the cause chain of this error |
| object, beginning with the error that this error object was created |
| from.</p> |
| <h5 id="example"><a href="#example">Example</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>anyhow::Error; |
| <span class="kw">use </span>std::io; |
| |
| <span class="kw">pub fn </span>underlying_io_error_kind(error: <span class="kw-2">&</span>Error) -> <span class="prelude-ty">Option</span><io::ErrorKind> { |
| <span class="kw">for </span>cause <span class="kw">in </span>error.chain() { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(io_error) = cause.downcast_ref::<io::Error>() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(io_error.kind()); |
| } |
| } |
| <span class="prelude-val">None |
| </span>}</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.root_cause" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#402-404">source</a><h4 class="code-header">pub fn <a href="#method.root_cause" class="fnname">root_cause</a>(&self) -> &(dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + 'static)</h4></section></summary><div class="docblock"><p>The lowest level cause of this error — this error’s cause’s |
| cause’s cause etc.</p> |
| <p>The root cause is the last error in the iterator produced by |
| <a href="struct.Error.html#method.chain" title="Error::chain"><code>chain()</code></a>.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#414-419">source</a><h4 class="code-header">pub fn <a href="#method.is" class="fnname">is</a><E>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><span class="where fmt-newline">where<br> E: <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/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</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></h4></section></summary><div class="docblock"><p>Returns true if <code>E</code> is the type held by this error object.</p> |
| <p>For errors with context, this method returns true if <code>E</code> matches the |
| type of the context <code>C</code> <strong>or</strong> the type of the error on which the |
| context has been attached. For details about the interaction between |
| context and downcasting, <a href="trait.Context.html#effect-on-downcasting">see here</a>.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.downcast" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#422-454">source</a><h4 class="code-header">pub fn <a href="#method.downcast" class="fnname">downcast</a><E>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><E, Self><span class="where fmt-newline">where<br> E: <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/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</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></h4></section></summary><div class="docblock"><p>Attempt to downcast the error object to a concrete type.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.downcast_ref" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#492-503">source</a><h4 class="code-header">pub fn <a href="#method.downcast_ref" class="fnname">downcast_ref</a><E>(&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.reference.html">&</a>E><span class="where fmt-newline">where<br> E: <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/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</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></h4></section></summary><div class="docblock"><p>Downcast this error object by reference.</p> |
| <h5 id="example-1"><a href="#example-1">Example</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// If the error was caused by redaction, then return a tombstone instead |
| // of the content. |
| </span><span class="kw">match </span>root_cause.downcast_ref::<DataStoreError>() { |
| <span class="prelude-val">Some</span>(DataStoreError::Censored(<span class="kw">_</span>)) => <span class="prelude-val">Ok</span>(Poll::Ready(REDACTED_CONTENT)), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(error), |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.downcast_mut" class="method has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#506-524">source</a><h4 class="code-header">pub fn <a href="#method.downcast_mut" class="fnname">downcast_mut</a><E>(&mut 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.reference.html">&mut </a>E><span class="where fmt-newline">where<br> E: <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/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</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></h4></section></summary><div class="docblock"><p>Downcast this error object by mutable reference.</p> |
| </div></details></div></details></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-AsRef%3Cdyn%20Error%20+%20%27static%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#988-992">source</a><a href="#impl-AsRef%3Cdyn%20Error%20+%20%27static%3E-for-Error" class="anchor"></a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">Error</a> + 'static> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.as_ref-1" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#989-991">source</a><a href="#method.as_ref-1" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html#tymethod.as_ref" class="fnname">as_ref</a>(&self) -> &(dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + 'static)</h4></section></summary><div class='docblock'>Converts this type into a shared reference of the (usually inferred) input type.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-AsRef%3Cdyn%20Error%20+%20Sync%20+%20Send%20+%20%27static%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#981-985">source</a><a href="#impl-AsRef%3Cdyn%20Error%20+%20Sync%20+%20Send%20+%20%27static%3E-for-Error" class="anchor"></a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">Error</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="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.as_ref" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#982-984">source</a><a href="#method.as_ref" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html#tymethod.as_ref" class="fnname">as_ref</a>(&self) -> &(dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">StdError</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)</h4></section></summary><div class='docblock'>Converts this type into a shared reference of the (usually inferred) input type.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Debug-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#576-580">source</a><a href="#impl-Debug-for-Error" class="anchor"></a><h3 class="code-header">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="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.fmt-1" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#577-579">source</a><a href="#method.fmt-1" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt" class="fnname">fmt</a>(&self, formatter: &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="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>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></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Deref-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#554-560">source</a><a href="#impl-Deref-for-Error" class="anchor"></a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Target" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Target" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" class="associatedtype">Target</a> = dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">Error</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="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static</h4></section></summary><div class='docblock'>The resulting type after dereferencing.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#557-559">source</a><a href="#method.deref" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#tymethod.deref" class="fnname">deref</a>(&self) -> &Self::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a></h4></section></summary><div class='docblock'>Dereferences the value.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-DerefMut-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#564-568">source</a><a href="#impl-DerefMut-for-Error" class="anchor"></a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.deref_mut" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#565-567">source</a><a href="#method.deref_mut" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html#tymethod.deref_mut" class="fnname">deref_mut</a>(&mut self) -> &mut Self::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a></h4></section></summary><div class='docblock'>Mutably dereferences the value.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Display-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#570-574">source</a><a href="#impl-Display-for-Error" class="anchor"></a><h3 class="code-header">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="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#571-573">source</a><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt" class="fnname">fmt</a>(&self, formatter: &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="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>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></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Drop-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#582-589">source</a><a href="#impl-Drop-for-Error" class="anchor"></a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.drop" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#583-588">source</a><a href="#method.drop" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop" class="fnname">drop</a>(&mut self)</h4></section></summary><div class='docblock'>Executes the destructor for this type. <a href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-From%3CE%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#541-550">source</a><a href="#impl-From%3CE%3E-for-Error" class="anchor"></a><h3 class="code-header">impl<E> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><E> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a><span class="where fmt-newline">where<br> E: <a class="trait" href="https://doc.rust-lang.org/nightly/core/error/trait.Error.html" title="trait core::error::Error">StdError</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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#546-549">source</a><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(error: E) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20%27static%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#974-978">source</a><a href="#impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20%27static%3E" class="anchor"></a><h3 class="code-header">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="struct.Error.html" title="struct anyhow::Error">Error</a>> for <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/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + 'static></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from-3" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#975-977">source</a><a href="#method.from-3" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(error: <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a>) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20Send%20+%20%27static%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#968-972">source</a><a href="#impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20Send%20+%20%27static%3E" class="anchor"></a><h3 class="code-header">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="struct.Error.html" title="struct anyhow::Error">Error</a>> for <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/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from-2" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#969-971">source</a><a href="#method.from-2" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(error: <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a>) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20Send%20+%20Sync%20+%20%27static%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#956-966">source</a><a href="#impl-From%3CError%3E-for-Box%3Cdyn%20StdError%20+%20Send%20+%20Sync%20+%20%27static%3E" class="anchor"></a><h3 class="code-header">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="struct.Error.html" title="struct anyhow::Error">Error</a>> for <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/core/error/trait.Error.html" title="trait core::error::Error">StdError</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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from-1" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#958-965">source</a><a href="#method.from-1" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(error: <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a>) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Provider-for-Error" class="impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#528-537">source</a><a href="#impl-Provider-for-Error" class="anchor"></a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Provider.html" title="trait core::any::Provider">Provider</a> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.provide" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/anyhow/error.rs.html#534-536">source</a><a href="#method.provide" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Provider.html#tymethod.provide" class="fnname">provide</a><'a>(&'a self, demand: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.Demand.html" title="struct core::any::Demand">Demand</a><'a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>provide_any</code>)</span></div></span><div class='docblock'>Data providers should implement this method to provide <em>all</em> values they are able to |
| provide by using <code>demand</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Provider.html#tymethod.provide">Read more</a></div></details></div></details></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"><section id="impl-RefUnwindSafe-for-Error" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-Error" class="anchor"></a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section><section id="impl-Send-for-Error" class="impl has-srclink"><a href="#impl-Send-for-Error" class="anchor"></a><h3 class="code-header">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="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section><section id="impl-Sync-for-Error" class="impl has-srclink"><a href="#impl-Sync-for-Error" class="anchor"></a><h3 class="code-header">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="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section><section id="impl-Unpin-for-Error" class="impl has-srclink"><a href="#impl-Unpin-for-Error" class="anchor"></a><h3 class="code-header">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="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section><section id="impl-UnwindSafe-for-Error" class="impl has-srclink"><a href="#impl-UnwindSafe-for-Error" class="anchor"></a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#200">source</a><a href="#impl-Any-for-Error" class="anchor"></a><h3 class="code-header">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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#201">source</a><a href="#method.type_id" class="anchor"></a><h4 class="code-header">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></h4></section></summary><div class='docblock'>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></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#211">source</a><a href="#impl-Borrow%3CT%3E-for-Error" class="anchor"></a><h3 class="code-header">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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#213">source</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">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</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#220">source</a><a href="#impl-BorrowMut%3CT%3E-for-Error" class="anchor"></a><h3 class="code-header">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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#221">source</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">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</h4></section></summary><div class='docblock'>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></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3C!%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#751">source</a><a href="#impl-From%3C!%3E-for-Error" class="anchor"></a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.never.html">!</a>> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from-4" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#752">source</a></span><a href="#method.from-4" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.never.html">!</a>) -> T</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#733">source</a><a href="#impl-From%3CT%3E-for-Error" class="anchor"></a><h3 class="code-header">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</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from-5" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#736">source</a></span><a href="#method.from-5" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#717">source</a><a href="#impl-Into%3CU%3E-for-Error" class="anchor"></a><h3 class="code-header">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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#725">source</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p> |
| <p>That is, this conversion is whatever the implementation of |
| <code><a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="From">From</a><T> for U</code> chooses to do.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-ToString-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#2497">source</a><a href="#impl-ToString-for-Error" class="anchor"></a><h3 class="code-header">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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.to_string" class="method trait-impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#2503">source</a><a href="#method.to_string" class="anchor"></a><h4 class="code-header">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></h4></section></summary><div class='docblock'>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></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#775">source</a><a href="#impl-TryFrom%3CU%3E-for-Error" class="anchor"></a><h3 class="code-header">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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#781">source</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">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="associatedtype" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-Error" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#760">source</a><a href="#impl-TryInto%3CU%3E-for-Error" class="anchor"></a><h3 class="code-header">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></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">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="associatedtype" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#766">source</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">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="associatedtype" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="anyhow" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
