308 lines
73 KiB
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308 lines
73 KiB
HTML
<!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."><title>Error in anyhow - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="anyhow" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Error</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../anyhow/index.html">anyhow</a><span class="version">1.0.102</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Error</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#display-representations" title="Display representations">Display representations</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.backtrace" title="backtrace">backtrace</a></li><li><a href="#method.chain" title="chain">chain</a></li><li><a href="#method.context" title="context">context</a></li><li><a href="#method.downcast" title="downcast">downcast</a></li><li><a href="#method.downcast_mut" title="downcast_mut">downcast_mut</a></li><li><a href="#method.downcast_ref" title="downcast_ref">downcast_ref</a></li><li><a href="#method.from_boxed" title="from_boxed">from_boxed</a></li><li><a href="#method.into_boxed_dyn_error" title="into_boxed_dyn_error">into_boxed_dyn_error</a></li><li><a href="#method.is" title="is">is</a></li><li><a href="#method.msg" title="msg">msg</a></li><li><a href="#method.new" title="new">new</a></li><li><a href="#method.reallocate_into_boxed_dyn_error_without_backtrace" title="reallocate_into_boxed_dyn_error_without_backtrace">reallocate_into_boxed_dyn_error_without_backtrace</a></li><li><a href="#method.root_cause" title="root_cause">root_cause</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-AsRef%3Cdyn+Error+%2B+Send+%2B+Sync%3E-for-Error" title="AsRef<dyn Error + Sync + Send>">AsRef<dyn Error + Sync + Send></a></li><li><a href="#impl-AsRef%3Cdyn+Error%3E-for-Error" title="AsRef<dyn Error>">AsRef<dyn Error></a></li><li><a href="#impl-Debug-for-Error" title="Debug">Debug</a></li><li><a href="#impl-Deref-for-Error" title="Deref">Deref</a></li><li><a href="#impl-DerefMut-for-Error" title="DerefMut">DerefMut</a></li><li><a href="#impl-Display-for-Error" title="Display">Display</a></li><li><a href="#impl-Drop-for-Error" title="Drop">Drop</a></li><li><a href="#impl-From%3CE%3E-for-Error" title="From<E>">From<E></a></li><li><a href="#impl-From%3CError%3E-for-Box%3Cdyn+Error%3E" title="From<Error>">From<Error></a></li><li><a href="#impl-From%3CError%3E-for-Box%3Cdyn+Error+%2B+Send%3E" title="From<Error>">From<Error></a></li><li><a href="#impl-From%3CError%3E-for-Box%3Cdyn+Error+%2B+Send+%2B+Sync%3E" title="From<Error>">From<Error></a></li><li><a href="#impl-RefUnwindSafe-for-Error" title="RefUnwindSafe">RefUnwindSafe</a></li><li><a href="#impl-UnwindSafe-for-Error" title="UnwindSafe">UnwindSafe</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-Error" title="Freeze">Freeze</a></li><li><a href="#impl-Send-for-Error" title="Send">Send</a></li><li><a href="#impl-Sync-for-Error" title="Sync">Sync</a></li><li><a href="#impl-Unpin-for-Error" title="Unpin">Unpin</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T" title="Any">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T" title="Borrow<T>">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T" title="BorrowMut<T>">BorrowMut<T></a></li><li><a href="#impl-From%3C!%3E-for-T" title="From<!>">From<!></a></li><li><a href="#impl-From%3CT%3E-for-T" title="From<T>">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T" title="Into<U>">Into<U></a></li><li><a href="#impl-Receiver-for-P" title="Receiver">Receiver</a></li><li><a href="#impl-ToString-for-T" title="ToString">ToString</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T" title="TryFrom<U>">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T" title="TryInto<U>">TryInto<U></a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate anyhow</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">anyhow</a></div><h1>Struct <span class="struct">Error</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/anyhow/lib.rs.html#390-392">Source</a> </span></div><pre class="rust item-decl"><code>pub struct Error { <span class="comment">/* private fields */</span> }</code></pre><details class="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>
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<p><code>Error</code> works a lot like <code>Box<dyn std::error::Error></code>, but with these
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differences:</p>
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<ul>
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<li><code>Error</code> requires that the error is <code>Send</code>, <code>Sync</code>, and <code>'static</code>.</li>
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<li><code>Error</code> guarantees that a backtrace is available, even if the underlying
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error type does not provide one.</li>
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<li><code>Error</code> is represented as a narrow pointer — exactly one word in
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size instead of two.</li>
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</ul>
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<br>
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<h2 id="display-representations"><a class="doc-anchor" href="#display-representations">§</a>Display representations</h2>
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<p>When you print an error object using “{}” or to_string(), only the outermost
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underlying error or context is printed, not any of the lower level causes.
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This is exactly as if you had called the Display impl of the error from
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which you constructed your anyhow::Error.</p>
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<div class="example-wrap"><pre class="language-console"><code>Failed to read instrs from ./path/to/instrs.json</code></pre></div>
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<p>To print causes as well using anyhow’s default formatting of causes, use the
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alternate selector “{:#}”.</p>
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<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>
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<p>The Debug format “{:?}” includes your backtrace if one was captured. Note
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that this is the representation you get by default if you return an error
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from <code>fn main</code> instead of printing it explicitly yourself.</p>
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<div class="example-wrap"><pre class="language-console"><code>Error: Failed to read instrs from ./path/to/instrs.json
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Caused by:
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No such file or directory (os error 2)</code></pre></div>
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<p>and if there is a backtrace available:</p>
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<div class="example-wrap"><pre class="language-console"><code>Error: Failed to read instrs from ./path/to/instrs.json
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Caused by:
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No such file or directory (os error 2)
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Stack backtrace:
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0: <E as anyhow::context::ext::StdError>::ext_context
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at /git/anyhow/src/backtrace.rs:26
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1: core::result::Result<T,E>::map_err
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at /git/rustc/src/libcore/result.rs:596
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2: anyhow::context::<impl anyhow::Context<T,E> for core::result::Result<T,E>>::with_context
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at /git/anyhow/src/context.rs:58
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3: testing::main
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at src/main.rs:5
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4: std::rt::lang_start
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at /git/rustc/src/libstd/rt.rs:61
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5: main
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6: __libc_start_main
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7: _start</code></pre></div>
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<p>To see a conventional struct-style Debug representation, use “{:#?}”.</p>
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<div class="example-wrap"><pre class="language-console"><code>Error {
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context: "Failed to read instrs from ./path/to/instrs.json",
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source: Os {
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code: 2,
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kind: NotFound,
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message: "No such file or directory",
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},
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}</code></pre></div>
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<p>If none of the built-in representations are appropriate and you would prefer
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to render the error and its cause chain yourself, it can be done something
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like this:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>anyhow::{Context, <span class="prelude-ty">Result</span>};
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<span class="kw">fn </span>main() {
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<span class="kw">if let </span><span class="prelude-val">Err</span>(err) = try_main() {
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<span class="macro">eprintln!</span>(<span class="string">"ERROR: {}"</span>, err);
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err.chain().skip(<span class="number">1</span>).for_each(|cause| <span class="macro">eprintln!</span>(<span class="string">"because: {}"</span>, cause));
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std::process::exit(<span class="number">1</span>);
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}
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}
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<span class="kw">fn </span>try_main() -> <span class="prelude-ty">Result</span><()> {
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...
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}</code></pre></div></div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#19-671">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="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#30-36">Source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a><E>(error: E) -> Self<div class="where">where
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E: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h4></section></summary><div class="docblock"><p>Create a new error object from any error type.</p>
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<p>The error type must be threadsafe and <code>'static</code>, so that the <code>Error</code>
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will be as well.</p>
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<p>If the error type does not provide a backtrace, a backtrace will be
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created here to ensure that a backtrace exists.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.msg" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#77-82">Source</a><h4 class="code-header">pub fn <a href="#method.msg" class="fn">msg</a><M>(message: M) -> Self<div class="where">where
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M: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h4></section></summary><div class="docblock"><p>Create a new error object from a printable error message.</p>
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<p>If the argument implements std::error::Error, prefer <code>Error::new</code>
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instead which preserves the underlying error’s cause chain and
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backtrace. If the argument may or may not implement std::error::Error
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now or in the future, use <code>anyhow!(err)</code> which handles either way
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correctly.</p>
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<p><code>Error::msg("...")</code> is equivalent to <code>anyhow!("...")</code> but occasionally
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convenient in places where a function is preferable over a macro, such
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as iterator or stream combinators:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>anyhow::{Error, <span class="prelude-ty">Result</span>};
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<span class="kw">use </span>futures::stream::{Stream, StreamExt, TryStreamExt};
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<span class="kw">async fn </span>demo<S>(stream: S) -> <span class="prelude-ty">Result</span><Vec<Output>>
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<span class="kw">where
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</span>S: Stream<Item = Input>,
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{
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stream
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.then(ffi::do_some_work) <span class="comment">// returns Result<Output, &str>
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</span>.map_err(Error::msg)
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.try_collect()
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.<span class="kw">await
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</span>}</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.from_boxed" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#140-143">Source</a><h4 class="code-header">pub fn <a href="#method.from_boxed" class="fn">from_boxed</a>(
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boxed_error: <a class="struct" href="https://doc.rust-lang.org/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static>,
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) -> Self</h4></section></summary><div class="docblock"><p>Construct an error object from a type-erased standard library error.</p>
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<p>This is mostly useful for interop with other error libraries.</p>
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<h5 id="example"><a class="doc-anchor" href="#example">§</a>Example</h5>
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<p>Here is a skeleton of a library that provides its own error abstraction.
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The pair of <code>From</code> impls provide bidirectional support for <code>?</code>
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conversion between <code>Report</code> and <code>anyhow::Error</code>.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError;
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<span class="kw">pub struct </span>Report {<span class="comment">/* ... */</span>}
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<span class="kw">impl</span><E> From<E> <span class="kw">for </span>Report
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<span class="kw">where
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</span>E: Into<anyhow::Error>,
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<span class="prelude-ty">Result</span><(), E>: anyhow::Context<(), E>,
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{
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<span class="kw">fn </span>from(error: E) -> <span class="self">Self </span>{
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<span class="kw">let </span>anyhow_error: anyhow::Error = error.into();
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<span class="kw">let </span>boxed_error: Box<<span class="kw">dyn </span>StdError + Send + Sync + <span class="lifetime">'static</span>> = anyhow_error.into();
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Report::from_boxed(boxed_error)
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}
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}
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<span class="kw">impl </span>From<Report> <span class="kw">for </span>anyhow::Error {
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<span class="kw">fn </span>from(report: Report) -> <span class="self">Self </span>{
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<span class="kw">let </span>boxed_error: Box<<span class="kw">dyn </span>StdError + Send + Sync + <span class="lifetime">'static</span>> = report.into_boxed();
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anyhow::Error::from_boxed(boxed_error)
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}
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}
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<span class="kw">impl </span>Report {
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<span class="kw">fn </span>from_boxed(boxed_error: Box<<span class="kw">dyn </span>StdError + Send + Sync + <span class="lifetime">'static</span>>) -> <span class="self">Self </span>{
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<span class="macro">todo!</span>()
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}
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<span class="kw">fn </span>into_boxed(<span class="self">self</span>) -> Box<<span class="kw">dyn </span>StdError + Send + Sync + <span class="lifetime">'static</span>> {
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<span class="macro">todo!</span>()
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}
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}
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<span class="comment">// Example usage: can use `?` in both directions.
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</span><span class="kw">fn </span>a() -> anyhow::Result<()> {
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b()<span class="question-mark">?</span>;
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<span class="prelude-val">Ok</span>(())
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}
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<span class="kw">fn </span>b() -> <span class="prelude-ty">Result</span><(), Report> {
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a()<span class="question-mark">?</span>;
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<span class="prelude-val">Ok</span>(())
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}</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.context" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#357-384">Source</a><h4 class="code-header">pub fn <a href="#method.context" class="fn">context</a><C>(self, context: C) -> Self<div class="where">where
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C: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h4></section></summary><div class="docblock"><p>Wrap the error value with additional context.</p>
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<p>For attaching context to a <code>Result</code> as it is propagated, the
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<a href="trait.Context.html" title="trait anyhow::Context"><code>Context</code></a> extension trait may be more convenient than
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this function.</p>
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<p>The primary reason to use <code>error.context(...)</code> instead of
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<code>result.context(...)</code> via the <code>Context</code> trait would be if the context
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needs to depend on some data held by the underlying error:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>anyhow::Result;
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<span class="kw">use </span>std::fs::File;
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<span class="kw">use </span>std::path::Path;
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<span class="kw">struct </span>ParseError {
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line: usize,
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column: usize,
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}
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<span class="kw">fn </span>parse_impl(file: File) -> <span class="prelude-ty">Result</span><T, ParseError> {
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...
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}
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<span class="kw">pub fn </span>parse(path: <span class="kw">impl </span>AsRef<Path>) -> <span class="prelude-ty">Result</span><T> {
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<span class="kw">let </span>file = File::open(<span class="kw-2">&</span>path)<span class="question-mark">?</span>;
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parse_impl(file).map_err(|error| {
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<span class="kw">let </span>context = <span class="macro">format!</span>(
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<span class="string">"only the first {} lines of {} are valid"</span>,
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error.line, path.as_ref().display(),
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);
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anyhow::Error::new(error).context(context)
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})
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}</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.backtrace" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#414-416">Source</a><h4 class="code-header">pub fn <a href="#method.backtrace" class="fn">backtrace</a>(&self) -> &<a class="struct" href="https://doc.rust-lang.org/1.93.1/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 class="doc-anchor" href="#stability">§</a>Stability</h5>
|
||
<p>Standard library backtraces are only available when using Rust ≥
|
||
1.65. On older 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. The return type of this
|
||
function on old compilers is <code>&(impl Debug + Display)</code>.</p>
|
||
<div class="example-wrap"><pre class="language-toml"><code>[dependencies]
|
||
anyhow = { version = "1.0", features = ["backtrace"] }</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.chain" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#441-443">Source</a><h4 class="code-header">pub fn <a href="#method.chain" class="fn">chain</a>(&self) -> <a class="struct" href="struct.Chain.html" title="struct anyhow::Chain">Chain</a><'_> <a href="#" class="tooltip" data-notable-ty="Chain<'_>">ⓘ</a></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-1"><a class="doc-anchor" href="#example-1">§</a>Example</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="toggle method-toggle" open><summary><section id="method.root_cause" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#452-454">Source</a><h4 class="code-header">pub fn <a href="#method.root_cause" class="fn">root_cause</a>(&self) -> &(dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/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="method anyhow::Error::chain"><code>chain()</code></a>.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.is" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#464-469">Source</a><h4 class="code-header">pub fn <a href="#method.is" class="fn">is</a><E>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a><div class="where">where
|
||
E: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></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" title="trait anyhow::Context">see here</a>.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.downcast" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#472-498">Source</a><h4 class="code-header">pub fn <a href="#method.downcast" class="fn">downcast</a><E>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><E, Self><div class="where">where
|
||
E: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h4></section></summary><div class="docblock"><p>Attempt to downcast the error object to a concrete type.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.downcast_ref" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#536-547">Source</a><h4 class="code-header">pub fn <a href="#method.downcast_ref" class="fn">downcast_ref</a><E>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&E</a>><div class="where">where
|
||
E: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h4></section></summary><div class="docblock"><p>Downcast this error object by reference.</p>
|
||
<h5 id="example-2"><a class="doc-anchor" href="#example-2">§</a>Example</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="toggle method-toggle" open><summary><section id="method.downcast_mut" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#550-562">Source</a><h4 class="code-header">pub fn <a href="#method.downcast_mut" class="fn">downcast_mut</a><E>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&mut E</a>><div class="where">where
|
||
E: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h4></section></summary><div class="docblock"><p>Downcast this error object by mutable reference.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.into_boxed_dyn_error" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#604-611">Source</a><h4 class="code-header">pub fn <a href="#method.into_boxed_dyn_error" class="fn">into_boxed_dyn_error</a>(self) -> <a class="struct" href="https://doc.rust-lang.org/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static></h4></section></summary><div class="docblock"><p>Convert to a standard library error trait object.</p>
|
||
<p>This is implemented as a cheap pointer cast that does not allocate or
|
||
deallocate memory. Like <a href="struct.Error.html#method.from_boxed" title="associated function anyhow::Error::from_boxed"><code>anyhow::Error::from_boxed</code></a>, it’s useful for
|
||
interop with other error libraries.</p>
|
||
<p>The same conversion is also available as
|
||
<code style="display:inline;white-space:normal;">impl From<anyhow::Error>
|
||
for Box<dyn Error + Send + Sync + 'static></code>.</p>
|
||
<p>If a backtrace was collected during construction of the <code>anyhow::Error</code>,
|
||
that backtrace remains accessible using the standard library <code>Error</code>
|
||
trait’s provider API, but as a consequence, the resulting boxed error
|
||
can no longer be downcast to its original underlying type.</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(error_generic_member_access)]
|
||
|
||
</span><span class="kw">use </span>anyhow::anyhow;
|
||
<span class="kw">use </span>std::backtrace::Backtrace;
|
||
<span class="kw">use </span>thiserror::Error;
|
||
|
||
<span class="attr">#[derive(Error, Debug)]
|
||
#[error(<span class="string">"..."</span>)]
|
||
</span><span class="kw">struct </span>MyError;
|
||
|
||
<span class="kw">let </span>anyhow_error = <span class="macro">anyhow!</span>(MyError);
|
||
<span class="macro">println!</span>(<span class="string">"{}"</span>, anyhow_error.backtrace()); <span class="comment">// has Backtrace
|
||
</span><span class="macro">assert!</span>(anyhow_error.downcast_ref::<MyError>().is_some()); <span class="comment">// can downcast
|
||
|
||
</span><span class="kw">let </span>boxed_dyn_error = anyhow_error.into_boxed_dyn_error();
|
||
<span class="macro">assert!</span>(std::error::request_ref::<Backtrace>(<span class="kw-2">&*</span>boxed_dyn_error).is_some()); <span class="comment">// has Backtrace
|
||
</span><span class="macro">assert!</span>(boxed_dyn_error.downcast_ref::<MyError>().is_none()); <span class="comment">// can no longer downcast</span></code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.reallocate_into_boxed_dyn_error_without_backtrace" class="method"><a class="src rightside" href="../src/anyhow/error.rs.html#645-654">Source</a><h4 class="code-header">pub fn <a href="#method.reallocate_into_boxed_dyn_error_without_backtrace" class="fn">reallocate_into_boxed_dyn_error_without_backtrace</a>(
|
||
self,
|
||
) -> <a class="struct" href="https://doc.rust-lang.org/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static></h4></section></summary><div class="docblock"><p>Convert to a standard library error trait object.</p>
|
||
<p>Unlike <code>self.into_boxed_dyn_error()</code>, this method relocates the
|
||
underlying error into a new allocation in order to make it downcastable
|
||
to <code>&E</code> or <code>Box<E></code> for its original underlying error type. Any
|
||
backtrace collected during construction of the <code>anyhow::Error</code> is
|
||
discarded.</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(error_generic_member_access)]
|
||
|
||
</span><span class="kw">use </span>anyhow::anyhow;
|
||
<span class="kw">use </span>std::backtrace::Backtrace;
|
||
<span class="kw">use </span>thiserror::Error;
|
||
|
||
<span class="attr">#[derive(Error, Debug)]
|
||
#[error(<span class="string">"..."</span>)]
|
||
</span><span class="kw">struct </span>MyError;
|
||
|
||
<span class="kw">let </span>anyhow_error = <span class="macro">anyhow!</span>(MyError);
|
||
<span class="macro">println!</span>(<span class="string">"{}"</span>, anyhow_error.backtrace()); <span class="comment">// has Backtrace
|
||
</span><span class="macro">assert!</span>(anyhow_error.downcast_ref::<MyError>().is_some()); <span class="comment">// can downcast
|
||
|
||
</span><span class="kw">let </span>boxed_dyn_error = anyhow_error.reallocate_into_boxed_dyn_error_without_backtrace();
|
||
<span class="macro">assert!</span>(std::error::request_ref::<Backtrace>(<span class="kw-2">&*</span>boxed_dyn_error).is_none()); <span class="comment">// Backtrace lost
|
||
</span><span class="macro">assert!</span>(boxed_dyn_error.downcast_ref::<MyError>().is_some()); <span class="comment">// can downcast to &MyError
|
||
</span><span class="macro">assert!</span>(boxed_dyn_error.downcast::<MyError>().is_ok()); <span class="comment">// can downcast to Box<MyError></span></code></pre></div></div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-AsRef%3Cdyn+Error%3E-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1052-1056">Source</a><a href="#impl-AsRef%3Cdyn+Error%3E-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">Error</a>> for <a class="struct" href="struct.Error.html" title="struct anyhow::Error">Error</a></h3><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>std</code> or non-<code>anyhow_no_core_error</code></strong> only.</div></span></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.as_ref-1" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1053-1055">Source</a><a href="#method.as_ref-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.AsRef.html#tymethod.as_ref" class="fn">as_ref</a>(&self) -> &(dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/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="toggle implementors-toggle" open><summary><section id="impl-AsRef%3Cdyn+Error+%2B+Send+%2B+Sync%3E-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1045-1049">Source</a><a href="#impl-AsRef%3Cdyn+Error+%2B+Send+%2B+Sync%3E-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">Error</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/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><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>std</code> or non-<code>anyhow_no_core_error</code></strong> only.</div></span></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.as_ref" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1046-1048">Source</a><a href="#method.as_ref" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.AsRef.html#tymethod.as_ref" class="fn">as_ref</a>(&self) -> &(dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/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="toggle implementors-toggle" open><summary><section id="impl-Debug-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#707-711">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/1.93.1/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="toggle method-toggle" open><summary><section id="method.fmt-1" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#708-710">Source</a><a href="#method.fmt-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.93.1/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/1.93.1/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Deref-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#686-692">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/1.93.1/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><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>std</code> or non-<code>anyhow_no_core_error</code></strong> only.</div></span></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Target" class="associatedtype trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#687">Source</a><a href="#associatedtype.Target" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Deref.html#associatedtype.Target" class="associatedtype">Target</a> = dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">Error</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a></h4></section></summary><div class='docblock'>The resulting type after dereferencing.</div></details><details class="toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#689-691">Source</a><a href="#method.deref" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Deref.html#tymethod.deref" class="fn">deref</a>(&self) -> &Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/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="toggle implementors-toggle" open><summary><section id="impl-DerefMut-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#695-699">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/1.93.1/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><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>std</code> or non-<code>anyhow_no_core_error</code></strong> only.</div></span></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.deref_mut" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#696-698">Source</a><a href="#method.deref_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.DerefMut.html#tymethod.deref_mut" class="fn">deref_mut</a>(&mut self) -> &mut Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/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="toggle implementors-toggle" open><summary><section id="impl-Display-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#701-705">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/1.93.1/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="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#702-704">Source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Display.html#tymethod.fmt" class="fn">fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.93.1/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/1.93.1/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Drop-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#713-720">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/1.93.1/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="toggle method-toggle" open><summary><section id="method.drop" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#714-719">Source</a><a href="#method.drop" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/ops/drop/trait.Drop.html#tymethod.drop" class="fn">drop</a>(&mut self)</h4></section></summary><div class='docblock'>Executes the destructor for this type. <a href="https://doc.rust-lang.org/1.93.1/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CE%3E-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#674-683">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/1.93.1/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><div class="where">where
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E: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h3><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>std</code> or non-<code>anyhow_no_core_error</code></strong> only.</div></span></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#679-682">Source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">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="toggle implementors-toggle" open><summary><section id="impl-From%3CError%3E-for-Box%3Cdyn+Error%3E" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1037-1042">Source</a><a href="#impl-From%3CError%3E-for-Box%3Cdyn+Error%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/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/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + 'static></h3><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>std</code> or non-<code>anyhow_no_core_error</code></strong> only.</div></span></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-3" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1039-1041">Source</a><a href="#method.from-3" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">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="toggle implementors-toggle" open><summary><section id="impl-From%3CError%3E-for-Box%3Cdyn+Error+%2B+Send%3E" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1029-1034">Source</a><a href="#impl-From%3CError%3E-for-Box%3Cdyn+Error+%2B+Send%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/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/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static></h3><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>std</code> or non-<code>anyhow_no_core_error</code></strong> only.</div></span></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-2" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1031-1033">Source</a><a href="#method.from-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">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="toggle implementors-toggle" open><summary><section id="impl-From%3CError%3E-for-Box%3Cdyn+Error+%2B+Send+%2B+Sync%3E" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1021-1026">Source</a><a href="#impl-From%3CError%3E-for-Box%3Cdyn+Error+%2B+Send+%2B+Sync%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/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/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html" title="trait core::error::Error">StdError</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static></h3><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>std</code> or non-<code>anyhow_no_core_error</code></strong> only.</div></span></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-1" class="method trait-impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1023-1025">Source</a><a href="#method.from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">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><section id="impl-RefUnwindSafe-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1059">Source</a><a href="#impl-RefUnwindSafe-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/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-UnwindSafe-for-Error" class="impl"><a class="src rightside" href="../src/anyhow/error.rs.html#1058">Source</a><a href="#impl-UnwindSafe-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/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="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-Error" class="impl"><a href="#impl-Freeze-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</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"><a href="#impl-Send-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/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"><a href="#impl-Sync-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/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"><a href="#impl-Unpin-for-Error" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/any.rs.html#138">Source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/any.rs.html#139">Source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.93.1/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/1.93.1/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#212">Source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#214">Source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#221">Source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#222">Source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3C!%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#802">Source</a><a href="#impl-From%3C!%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.never.html">!</a>> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-5" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#803">Source</a><a href="#method.from-5" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/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="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#785">Source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-4" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#788">Source</a><a href="#method.from-4" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#767-769">Source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#777">Source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code><a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Receiver-for-P" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/ops/deref.rs.html#378-380">Source</a><a href="#impl-Receiver-for-P" class="anchor">§</a><h3 class="code-header">impl<P, T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Receiver.html" title="trait core::ops::deref::Receiver">Receiver</a> for P<div class="where">where
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P: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a><Target = T> + ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Target-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/ops/deref.rs.html#382">Source</a><a href="#associatedtype.Target-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Receiver.html#associatedtype.Target" class="associatedtype">Target</a> = T</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>arbitrary_self_types</code>)</span></div></span><div class='docblock'>The target type on which the method may be called.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToString-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/string.rs.html#2864">Source</a><a href="#impl-ToString-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/alloc/string/trait.ToString.html" title="trait alloc::string::ToString">ToString</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.to_string" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/string.rs.html#2866">Source</a><a href="#method.to_string" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/alloc/string/trait.ToString.html#tymethod.to_string" class="fn">to_string</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.93.1/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/1.93.1/alloc/string/trait.ToString.html#tymethod.to_string">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#827-829">Source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#831">Source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.93.1/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="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#834">Source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/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="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#811-813">Source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#815">Source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/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="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#818">Source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/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><script type="text/json" id="notable-traits-data">{"Chain<'_>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Chain.html\" title=\"struct anyhow::Chain\">Chain</a><'a></code></h3><pre><code><div class=\"where\">impl<'a> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/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></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = &'a (dyn <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/error/trait.Error.html\" title=\"trait core::error::Error\">StdError</a> + 'static);</div>"}</script></section></div></main></body></html> |