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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/anyhow-1.0.71/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</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" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><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></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../anyhow/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><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="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="doccomment">//! [![github]](https://github.com/dtolnay/anyhow)&amp;ensp;[![crates-io]](https://crates.io/crates/anyhow)&amp;ensp;[![docs-rs]](https://docs.rs/anyhow)
 //!
 //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&amp;labelColor=555555&amp;logo=github
 //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&amp;labelColor=555555&amp;logo=rust
 //! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&amp;labelColor=555555&amp;logo=docs.rs
 //!
 //! &lt;br&gt;
 //!
 //! This library provides [`anyhow::Error`][Error], a trait object based error
 //! type for easy idiomatic error handling in Rust applications.
 //!
 //! &lt;br&gt;
 //!
 //! # Details
 //!
 //! - Use `Result&lt;T, anyhow::Error&gt;`, or equivalently `anyhow::Result&lt;T&gt;`, as
 //!   the return type of any fallible function.
 //!
 //!   Within the function, use `?` to easily propagate any error that implements
 //!   the `std::error::Error` trait.
 //!
 //!   ```
 //!   # pub trait Deserialize {}
 //!   #
 //!   # mod serde_json {
 //!   #     use super::Deserialize;
 //!   #     use std::io;
 //!   #
 //!   #     pub fn from_str&lt;T: Deserialize&gt;(json: &amp;str) -&gt; io::Result&lt;T&gt; {
 //!   #         unimplemented!()
 //!   #     }
 //!   # }
 //!   #
 //!   # struct ClusterMap;
 //!   #
 //!   # impl Deserialize for ClusterMap {}
 //!   #
 //!   use anyhow::Result;
 //!
 //!   fn get_cluster_info() -&gt; Result&lt;ClusterMap&gt; {
 //!       let config = std::fs::read_to_string(&quot;cluster.json&quot;)?;
 //!       let map: ClusterMap = serde_json::from_str(&amp;config)?;
 //!       Ok(map)
 //!   }
 //!   #
 //!   # fn main() {}
 //!   ```
 //!
 //! - Attach context to help the person troubleshooting the error understand
 //!   where things went wrong. A low-level error like &quot;No such file or
 //!   directory&quot; can be annoying to debug without more context about what higher
 //!   level step the application was in the middle of.
 //!
 //!   ```
 //!   # struct It;
 //!   #
 //!   # impl It {
 //!   #     fn detach(&amp;self) -&gt; Result&lt;()&gt; {
 //!   #         unimplemented!()
 //!   #     }
 //!   # }
 //!   #
 //!   use anyhow::{Context, Result};
 //!
 //!   fn main() -&gt; Result&lt;()&gt; {
 //!       # return Ok(());
 //!       #
 //!       # const _: &amp;str = stringify! {
 //!       ...
 //!       # };
 //!       #
 //!       # let it = It;
 //!       # let path = &quot;./path/to/instrs.json&quot;;
 //!       #
 //!       it.detach().context(&quot;Failed to detach the important thing&quot;)?;
 //!
 //!       let content = std::fs::read(path)
 //!           .with_context(|| format!(&quot;Failed to read instrs from {}&quot;, path))?;
 //!       #
 //!       # const _: &amp;str = stringify! {
 //!       ...
 //!       # };
 //!       #
 //!       # Ok(())
 //!   }
 //!   ```
 //!
 //!   ```console
 //!   Error: Failed to read instrs from ./path/to/instrs.json
 //!
 //!   Caused by:
 //!       No such file or directory (os error 2)
 //!   ```
 //!
 //! - Downcasting is supported and can be by value, by shared reference, or by
 //!   mutable reference as needed.
 //!
 //!   ```
 //!   # use anyhow::anyhow;
 //!   # use std::fmt::{self, Display};
 //!   # use std::task::Poll;
 //!   #
 //!   # #[derive(Debug)]
 //!   # enum DataStoreError {
 //!   #     Censored(()),
 //!   # }
 //!   #
 //!   # impl Display for DataStoreError {
 //!   #     fn fmt(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {
 //!   #         unimplemented!()
 //!   #     }
 //!   # }
 //!   #
 //!   # impl std::error::Error for DataStoreError {}
 //!   #
 //!   # const REDACTED_CONTENT: () = ();
 //!   #
 //!   # let error = anyhow!(&quot;...&quot;);
 //!   # let root_cause = &amp;error;
 //!   #
 //!   # let ret =
 //!   // If the error was caused by redaction, then return a
 //!   // tombstone instead of the content.
 //!   match root_cause.downcast_ref::&lt;DataStoreError&gt;() {
 //!       Some(DataStoreError::Censored(_)) =&gt; Ok(Poll::Ready(REDACTED_CONTENT)),
 //!       None =&gt; Err(error),
 //!   }
 //!   # ;
 //!   ```
 //!
 //! - If using the nightly channel, or stable with `features = [&quot;backtrace&quot;]`, a
 //!   backtrace is captured and printed with the error if the underlying error
 //!   type does not already provide its own. In order to see backtraces, they
 //!   must be enabled through the environment variables described in
 //!   [`std::backtrace`]:
 //!
 //!   - If you want panics and errors to both have backtraces, set
 //!     `RUST_BACKTRACE=1`;
 //!   - If you want only errors to have backtraces, set `RUST_LIB_BACKTRACE=1`;
 //!   - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and
 //!     `RUST_LIB_BACKTRACE=0`.
 //!
 //!   The tracking issue for this feature is [rust-lang/rust#53487].
 //!
 //!   [`std::backtrace`]: https://doc.rust-lang.org/std/backtrace/index.html#environment-variables
 //!   [rust-lang/rust#53487]: https://github.com/rust-lang/rust/issues/53487
 //!
 //! - Anyhow works with any error type that has an impl of `std::error::Error`,
 //!   including ones defined in your crate. We do not bundle a `derive(Error)`
 //!   macro but you can write the impls yourself or use a standalone macro like
 //!   [thiserror].
 //!
 //!   [thiserror]: https://github.com/dtolnay/thiserror
 //!
 //!   ```
 //!   use thiserror::Error;
 //!
 //!   #[derive(Error, Debug)]
 //!   pub enum FormatError {
 //!       #[error(&quot;Invalid header (expected {expected:?}, got {found:?})&quot;)]
 //!       InvalidHeader {
 //!           expected: String,
 //!           found: String,
 //!       },
 //!       #[error(&quot;Missing attribute: {0}&quot;)]
 //!       MissingAttribute(String),
 //!   }
 //!   ```
 //!
 //! - One-off error messages can be constructed using the `anyhow!` macro, which
 //!   supports string interpolation and produces an `anyhow::Error`.
 //!
 //!   ```
 //!   # use anyhow::{anyhow, Result};
 //!   #
 //!   # fn demo() -&gt; Result&lt;()&gt; {
 //!   #     let missing = &quot;...&quot;;
 //!   return Err(anyhow!(&quot;Missing attribute: {}&quot;, missing));
 //!   #     Ok(())
 //!   # }
 //!   ```
 //!
 //!   A `bail!` macro is provided as a shorthand for the same early return.
 //!
 //!   ```
 //!   # use anyhow::{bail, Result};
 //!   #
 //!   # fn demo() -&gt; Result&lt;()&gt; {
 //!   #     let missing = &quot;...&quot;;
 //!   bail!(&quot;Missing attribute: {}&quot;, missing);
 //!   #     Ok(())
 //!   # }
 //!   ```
 //!
 //! &lt;br&gt;
 //!
 //! # No-std support
 //!
 //! In no_std mode, the same API is almost all available and works the same way.
 //! To depend on Anyhow in no_std mode, disable our default enabled &quot;std&quot;
 //! feature in Cargo.toml. A global allocator is required.
 //!
 //! ```toml
 //! [dependencies]
 //! anyhow = { version = &quot;1.0&quot;, default-features = false }
 //! ```
 //!
 //! Since the `?`-based error conversions would normally rely on the
 //! `std::error::Error` trait which is only available through std, no_std mode
 //! will require an explicit `.map_err(Error::msg)` when working with a
 //! non-Anyhow error type inside a function that returns Anyhow&#39;s error type.

 </span><span class="attribute">#![doc(html_root_url = <span class="string">&quot;https://docs.rs/anyhow/1.0.71&quot;</span>)]
 #![cfg_attr(backtrace, feature(error_generic_member_access, provide_any))]
 #![cfg_attr(doc_cfg, feature(doc_cfg))]
 #![cfg_attr(not(feature = <span class="string">&quot;std&quot;</span>), no_std)]
 #![deny(dead_code, unused_imports, unused_mut)]
 #![allow(
     clippy::doc_markdown,
     clippy::enum_glob_use,
     clippy::explicit_auto_deref,
     clippy::extra_unused_type_parameters,
     clippy::let_underscore_untyped,
     clippy::missing_errors_doc,
     clippy::missing_panics_doc,
     clippy::module_name_repetitions,
     clippy::must_use_candidate,
     clippy::needless_doctest_main,
     clippy::new_ret_no_self,
     clippy::redundant_else,
     clippy::return_self_not_must_use,
     clippy::unused_self,
     clippy::used_underscore_binding,
     clippy::wildcard_imports,
     clippy::wrong_self_convention
 )]

 </span><span class="kw">extern crate </span>alloc;

 <span class="attribute">#[macro_use]
 </span><span class="kw">mod </span>backtrace;
 <span class="kw">mod </span>chain;
 <span class="kw">mod </span>context;
 <span class="kw">mod </span>ensure;
 <span class="kw">mod </span>error;
 <span class="kw">mod </span>fmt;
 <span class="kw">mod </span>kind;
 <span class="kw">mod </span>macros;
 <span class="kw">mod </span>ptr;
 <span class="kw">mod </span>wrapper;

 <span class="kw">use </span><span class="kw">crate</span>::error::ErrorImpl;
 <span class="kw">use </span><span class="kw">crate</span>::ptr::Own;
 <span class="kw">use </span>core::fmt::Display;

 <span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
 </span><span class="kw">use </span>core::fmt::Debug;

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError;

 <span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
 </span><span class="kw">trait </span>StdError: Debug + Display {
     <span class="kw">fn </span>source(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(<span class="kw">dyn </span>StdError + <span class="lifetime">&#39;static</span>)&gt; {
         <span class="prelude-val">None
     </span>}
 }

 <span class="attribute">#[doc(no_inline)]
 </span><span class="kw">pub use </span>anyhow <span class="kw">as </span>format_err;

 <span class="doccomment">/// The `Error` type, a wrapper around a dynamic error type.
 ///
 /// `Error` works a lot like `Box&lt;dyn std::error::Error&gt;`, but with these
 /// differences:
 ///
 /// - `Error` requires that the error is `Send`, `Sync`, and `&#39;static`.
 /// - `Error` guarantees that a backtrace is available, even if the underlying
 ///   error type does not provide one.
 /// - `Error` is represented as a narrow pointer &amp;mdash; exactly one word in
 ///   size instead of two.
 ///
 /// &lt;br&gt;
 ///
 /// # Display representations
 ///
 /// When you print an error object using &quot;{}&quot; 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.
 ///
 /// ```console
 /// Failed to read instrs from ./path/to/instrs.json
 /// ```
 ///
 /// To print causes as well using anyhow&#39;s default formatting of causes, use the
 /// alternate selector &quot;{:#}&quot;.
 ///
 /// ```console
 /// Failed to read instrs from ./path/to/instrs.json: No such file or directory (os error 2)
 /// ```
 ///
 /// The Debug format &quot;{:?}&quot; includes your backtrace if one was captured. Note
 /// that this is the representation you get by default if you return an error
 /// from `fn main` instead of printing it explicitly yourself.
 ///
 /// ```console
 /// Error: Failed to read instrs from ./path/to/instrs.json
 ///
 /// Caused by:
 ///     No such file or directory (os error 2)
 /// ```
 ///
 /// and if there is a backtrace available:
 ///
 /// ```console
 /// Error: Failed to read instrs from ./path/to/instrs.json
 ///
 /// Caused by:
 ///     No such file or directory (os error 2)
 ///
 /// Stack backtrace:
 ///    0: &lt;E as anyhow::context::ext::StdError&gt;::ext_context
 ///              at /git/anyhow/src/backtrace.rs:26
 ///    1: core::result::Result&lt;T,E&gt;::map_err
 ///              at /git/rustc/src/libcore/result.rs:596
 ///    2: anyhow::context::&lt;impl anyhow::Context&lt;T,E&gt; for core::result::Result&lt;T,E&gt;&gt;::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
 /// ```
 ///
 /// To see a conventional struct-style Debug representation, use &quot;{:#?}&quot;.
 ///
 /// ```console
 /// Error {
 ///     context: &quot;Failed to read instrs from ./path/to/instrs.json&quot;,
 ///     source: Os {
 ///         code: 2,
 ///         kind: NotFound,
 ///         message: &quot;No such file or directory&quot;,
 ///     },
 /// }
 /// ```
 ///
 /// 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:
 ///
 /// ```
 /// use anyhow::{Context, Result};
 ///
 /// fn main() {
 ///     if let Err(err) = try_main() {
 ///         eprintln!(&quot;ERROR: {}&quot;, err);
 ///         err.chain().skip(1).for_each(|cause| eprintln!(&quot;because: {}&quot;, cause));
 ///         std::process::exit(1);
 ///     }
 /// }
 ///
 /// fn try_main() -&gt; Result&lt;()&gt; {
 ///     # const IGNORE: &amp;str = stringify! {
 ///     ...
 ///     # };
 ///     # Ok(())
 /// }
 /// ```
 </span><span class="attribute">#[cfg_attr(not(doc), repr(transparent))]
 </span><span class="kw">pub struct </span>Error {
     inner: Own&lt;ErrorImpl&gt;,
 }

 <span class="doccomment">/// Iterator of a chain of source errors.
 ///
 /// This type is the iterator returned by [`Error::chain`].
 ///
 /// # Example
 ///
 /// ```
 /// use anyhow::Error;
 /// use std::io;
 ///
 /// pub fn underlying_io_error_kind(error: &amp;Error) -&gt; Option&lt;io::ErrorKind&gt; {
 ///     for cause in error.chain() {
 ///         if let Some(io_error) = cause.downcast_ref::&lt;io::Error&gt;() {
 ///             return Some(io_error.kind());
 ///         }
 ///     }
 ///     None
 /// }
 /// ```
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">&quot;std&quot;</span>)))]
 #[derive(Clone)]
 </span><span class="kw">pub struct </span>Chain&lt;<span class="lifetime">&#39;a</span>&gt; {
     state: <span class="kw">crate</span>::chain::ChainState&lt;<span class="lifetime">&#39;a</span>&gt;,
 }

 <span class="doccomment">/// `Result&lt;T, Error&gt;`
 ///
 /// This is a reasonable return type to use throughout your application but also
 /// for `fn main`; if you do, failures will be printed along with any
 /// [context][Context] and a backtrace if one was captured.
 ///
 /// `anyhow::Result` may be used with one *or* two type parameters.
 ///
 /// ```rust
 /// use anyhow::Result;
 ///
 /// # const IGNORE: &amp;str = stringify! {
 /// fn demo1() -&gt; Result&lt;T&gt; {...}
 ///            // ^ equivalent to std::result::Result&lt;T, anyhow::Error&gt;
 ///
 /// fn demo2() -&gt; Result&lt;T, OtherError&gt; {...}
 ///            // ^ equivalent to std::result::Result&lt;T, OtherError&gt;
 /// # };
 /// ```
 ///
 /// # Example
 ///
 /// ```
 /// # pub trait Deserialize {}
 /// #
 /// # mod serde_json {
 /// #     use super::Deserialize;
 /// #     use std::io;
 /// #
 /// #     pub fn from_str&lt;T: Deserialize&gt;(json: &amp;str) -&gt; io::Result&lt;T&gt; {
 /// #         unimplemented!()
 /// #     }
 /// # }
 /// #
 /// # #[derive(Debug)]
 /// # struct ClusterMap;
 /// #
 /// # impl Deserialize for ClusterMap {}
 /// #
 /// use anyhow::Result;
 ///
 /// fn main() -&gt; Result&lt;()&gt; {
 ///     # return Ok(());
 ///     let config = std::fs::read_to_string(&quot;cluster.json&quot;)?;
 ///     let map: ClusterMap = serde_json::from_str(&amp;config)?;
 ///     println!(&quot;cluster info: {:#?}&quot;, map);
 ///     Ok(())
 /// }
 /// ```
 </span><span class="kw">pub type </span><span class="prelude-ty">Result</span>&lt;T, E = Error&gt; = core::result::Result&lt;T, E&gt;;

 <span class="doccomment">/// Provides the `context` method for `Result`.
 ///
 /// This trait is sealed and cannot be implemented for types outside of
 /// `anyhow`.
 ///
 /// &lt;br&gt;
 ///
 /// # Example
 ///
 /// ```
 /// use anyhow::{Context, Result};
 /// use std::fs;
 /// use std::path::PathBuf;
 ///
 /// pub struct ImportantThing {
 ///     path: PathBuf,
 /// }
 ///
 /// impl ImportantThing {
 ///     # const IGNORE: &amp;&#39;static str = stringify! {
 ///     pub fn detach(&amp;mut self) -&gt; Result&lt;()&gt; {...}
 ///     # };
 ///     # fn detach(&amp;mut self) -&gt; Result&lt;()&gt; {
 ///     #     unimplemented!()
 ///     # }
 /// }
 ///
 /// pub fn do_it(mut it: ImportantThing) -&gt; Result&lt;Vec&lt;u8&gt;&gt; {
 ///     it.detach().context(&quot;Failed to detach the important thing&quot;)?;
 ///
 ///     let path = &amp;it.path;
 ///     let content = fs::read(path)
 ///         .with_context(|| format!(&quot;Failed to read instrs from {}&quot;, path.display()))?;
 ///
 ///     Ok(content)
 /// }
 /// ```
 ///
 /// When printed, the outermost context would be printed first and the lower
 /// level underlying causes would be enumerated below.
 ///
 /// ```console
 /// Error: Failed to read instrs from ./path/to/instrs.json
 ///
 /// Caused by:
 ///     No such file or directory (os error 2)
 /// ```
 ///
 /// Refer to the [Display representations] documentation for other forms in
 /// which this context chain can be rendered.
 ///
 /// [Display representations]: Error#display-representations
 ///
 /// &lt;br&gt;
 ///
 /// # Effect on downcasting
 ///
 /// After attaching context of type `C` onto an error of type `E`, the resulting
 /// `anyhow::Error` may be downcast to `C` **or** to `E`.
 ///
 /// That is, in codebases that rely on downcasting, Anyhow&#39;s context supports
 /// both of the following use cases:
 ///
 ///   - **Attaching context whose type is insignificant onto errors whose type
 ///     is used in downcasts.**
 ///
 ///     In other error libraries whose context is not designed this way, it can
 ///     be risky to introduce context to existing code because new context might
 ///     break existing working downcasts. In Anyhow, any downcast that worked
 ///     before adding context will continue to work after you add a context, so
 ///     you should freely add human-readable context to errors wherever it would
 ///     be helpful.
 ///
 ///     ```
 ///     # use anyhow::bail;
 ///     # use thiserror::Error;
 ///     #
 ///     # #[derive(Error, Debug)]
 ///     # #[error(&quot;???&quot;)]
 ///     # struct SuspiciousError;
 ///     #
 ///     # fn helper() -&gt; Result&lt;()&gt; {
 ///     #     bail!(SuspiciousError);
 ///     # }
 ///     #
 ///     use anyhow::{Context, Result};
 ///
 ///     fn do_it() -&gt; Result&lt;()&gt; {
 ///         helper().context(&quot;Failed to complete the work&quot;)?;
 ///         # const IGNORE: &amp;str = stringify! {
 ///         ...
 ///         # };
 ///         # unreachable!()
 ///     }
 ///
 ///     fn main() {
 ///         let err = do_it().unwrap_err();
 ///         if let Some(e) = err.downcast_ref::&lt;SuspiciousError&gt;() {
 ///             // If helper() returned SuspiciousError, this downcast will
 ///             // correctly succeed even with the context in between.
 ///             # return;
 ///         }
 ///         # panic!(&quot;expected downcast to succeed&quot;);
 ///     }
 ///     ```
 ///
 ///   - **Attaching context whose type is used in downcasts onto errors whose
 ///     type is insignificant.**
 ///
 ///     Some codebases prefer to use machine-readable context to categorize
 ///     lower level errors in a way that will be actionable to higher levels of
 ///     the application.
 ///
 ///     ```
 ///     # use anyhow::bail;
 ///     # use thiserror::Error;
 ///     #
 ///     # #[derive(Error, Debug)]
 ///     # #[error(&quot;???&quot;)]
 ///     # struct HelperFailed;
 ///     #
 ///     # fn helper() -&gt; Result&lt;()&gt; {
 ///     #     bail!(&quot;no such file or directory&quot;);
 ///     # }
 ///     #
 ///     use anyhow::{Context, Result};
 ///
 ///     fn do_it() -&gt; Result&lt;()&gt; {
 ///         helper().context(HelperFailed)?;
 ///         # const IGNORE: &amp;str = stringify! {
 ///         ...
 ///         # };
 ///         # unreachable!()
 ///     }
 ///
 ///     fn main() {
 ///         let err = do_it().unwrap_err();
 ///         if let Some(e) = err.downcast_ref::&lt;HelperFailed&gt;() {
 ///             // If helper failed, this downcast will succeed because
 ///             // HelperFailed is the context that has been attached to
 ///             // that error.
 ///             # return;
 ///         }
 ///         # panic!(&quot;expected downcast to succeed&quot;);
 ///     }
 ///     ```
 </span><span class="kw">pub trait </span>Context&lt;T, E&gt;: context::private::Sealed {
     <span class="doccomment">/// Wrap the error value with additional context.
     </span><span class="kw">fn </span>context&lt;C&gt;(<span class="self">self</span>, context: C) -&gt; <span class="prelude-ty">Result</span>&lt;T, Error&gt;
     <span class="kw">where
         </span>C: Display + Send + Sync + <span class="lifetime">&#39;static</span>;

     <span class="doccomment">/// Wrap the error value with additional context that is evaluated lazily
     /// only once an error does occur.
     </span><span class="kw">fn </span>with_context&lt;C, F&gt;(<span class="self">self</span>, f: F) -&gt; <span class="prelude-ty">Result</span>&lt;T, Error&gt;
     <span class="kw">where
         </span>C: Display + Send + Sync + <span class="lifetime">&#39;static</span>,
         F: FnOnce() -&gt; C;
 }

 <span class="doccomment">/// Equivalent to Ok::&lt;_, anyhow::Error&gt;(value).
 ///
 /// This simplifies creation of an anyhow::Result in places where type inference
 /// cannot deduce the `E` type of the result &amp;mdash; without needing to write
 /// `Ok::&lt;_, anyhow::Error&gt;(value)`.
 ///
 /// One might think that `anyhow::Result::Ok(value)` would work in such cases
 /// but it does not.
 ///
 /// ```console
 /// error[E0282]: type annotations needed for `std::result::Result&lt;i32, E&gt;`
 ///   --&gt; src/main.rs:11:13
 ///    |
 /// 11 |     let _ = anyhow::Result::Ok(1);
 ///    |         -   ^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `E` declared on the enum `Result`
 ///    |         |
 ///    |         consider giving this pattern the explicit type `std::result::Result&lt;i32, E&gt;`, where the type parameter `E` is specified
 /// ```
 </span><span class="attribute">#[allow(non_snake_case)]
 </span><span class="kw">pub fn </span><span class="prelude-val">Ok</span>&lt;T&gt;(t: T) -&gt; <span class="prelude-ty">Result</span>&lt;T&gt; {
     Result::Ok(t)
 }

 <span class="comment">// Not public API. Referenced by macro-generated code.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub mod </span>__private {
     <span class="kw">use </span><span class="kw">crate</span>::Error;
     <span class="kw">use </span>alloc::fmt;
     <span class="kw">use </span>core::fmt::Arguments;

     <span class="kw">pub use </span><span class="kw">crate</span>::ensure::{BothDebug, NotBothDebug};
     <span class="kw">pub use </span>alloc::format;
     <span class="kw">pub use </span>core::result::Result::Err;
     <span class="kw">pub use </span>core::{concat, format_args, stringify};

     <span class="attribute">#[doc(hidden)]
     </span><span class="kw">pub mod </span>kind {
         <span class="kw">pub use </span><span class="kw">crate</span>::kind::{AdhocKind, TraitKind};

         <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
         </span><span class="kw">pub use </span><span class="kw">crate</span>::kind::BoxedKind;
     }

     <span class="attribute">#[doc(hidden)]
     #[inline]
     #[cold]
     </span><span class="kw">pub fn </span>format_err(args: Arguments) -&gt; Error {
         <span class="attribute">#[cfg(anyhow_no_fmt_arguments_as_str)]
         </span><span class="kw">let </span>fmt_arguments_as_str = <span class="prelude-val">None</span>::&lt;<span class="kw-2">&amp;</span>str&gt;;
         <span class="attribute">#[cfg(not(anyhow_no_fmt_arguments_as_str))]
         </span><span class="kw">let </span>fmt_arguments_as_str = args.as_str();

         <span class="kw">if let </span><span class="prelude-val">Some</span>(message) = fmt_arguments_as_str {
             <span class="comment">// anyhow!(&quot;literal&quot;), can downcast to &amp;&#39;static str
             </span>Error::msg(message)
         } <span class="kw">else </span>{
             <span class="comment">// anyhow!(&quot;interpolate {var}&quot;), can downcast to String
             </span>Error::msg(fmt::format(args))
         }
     }

     <span class="attribute">#[doc(hidden)]
     #[inline]
     #[cold]
     #[must_use]
     </span><span class="kw">pub fn </span>must_use(error: Error) -&gt; Error {
         error
     }
 }
 </code></pre></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>