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NK This library provides [`anyhow::Error`][Error], a trait object based error@= type for easy idiomatic error handling in Rust applications.Dl # DetailsMJ - Use `Result`, or equivalently `anyhow::Result`, as/, the return type of any fallible function.PM Within the function, use `?` to easily propagate any error that implements&# the [`std::error::Error`] trait.L ```  # pub trait Deserialize {}< # # mod serde_json {# # use super::Deserialize;Đ # use std::io;<JG # pub fn from_str(json: &str) -> io::Result {  # unimplemented!()l  # }L  # }< Խ  # struct ClusterMap;<  *' # impl Deserialize for ClusterMap {}< ̓  use anyhow::Result;  30 fn get_cluster_info() -> Result { @= let config = std::fs::read_to_string("cluster.json")?; ?< let map: ClusterMap = serde_json::from_str(&config)?;  Ok(map)<  }<   # fn main() {}L   LI - Attach context to help the person troubleshooting the error understand FC where things went wrong. A low-level error like "No such file or PM directory" can be annoying to debug without more context about what higher63 level step the application was in the middle of.L # struct It;< # impl It {,) # fn detach(&self) -> Result<()> { ۜlL<$! use anyhow::{Context, Result}; fn main() -> Result<()> {Թ # return Ok(());\ #(% # const _: &str = stringify! {l ...t # };\IJ # let it = It;/, # let path = "./path/to/instrs.json";\GD it.detach().context("Failed to detach the important thing")?;+( let content = std::fs::read(path)PM .with_context(|| format!("Failed to read instrs from {}", path))?;\(lt\ # Ok(())< L ```console=: Error: Failed to read instrs from ./path/to/instrs.json Caused by:0- No such file or directory (os error 2)LNK - Downcasting is supported and can be by value, by shared reference, or by" mutable reference as needed.L # use anyhow::anyhow;&# # use std::fmt::{self, Display}; # use std::task::Poll;< # #[derive(Debug)] # enum DataStoreError {̙ # Censored(()),L<)& # impl Display for DataStoreError {JG # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { ۜlL<41 # impl std::error::Error for DataStoreError {}<(% # const REDACTED_CONTENT: () = ();<# # let error = anyhow!("...");  # let root_cause = &error;< # let ret =<9 // If the error was caused by redaction, then return a*' // tombstone instead of the content.96 match root_cause.downcast_ref::() {QN Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)), None => Err(error),< L # ;LKH - If using Rust ≥ 1.65, a backtrace is captured and printed with theMJ error if the underlying error type does not already provide its own. InKH order to see backtraces, they must be enabled through the environment0- variables described in [`std::backtrace`]:  B? - If you want panics and errors to both have backtraces, set  `RUST_BACKTRACE=1`; OL - If you want only errors to have backtraces, set `RUST_LIB_BACKTRACE=1`;!NK - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and" `RUST_LIB_BACKTRACE=0`."">; [`std::backtrace`]: std::backtrace#environment-variables""OL - Anyhow works with any error type that has an impl of `std::error::Error`,#NK including ones defined in your crate. We do not bundle a `derive(Error)`$OL macro but you can write the impls yourself or use a standalone macro like$ [thiserror].$%74 [thiserror]: https://github.com/dtolnay/thiserror%L%% use thiserror::Error;%% #[derive(Error, Debug)]& pub enum FormatError {&KH #[error("Invalid header (expected {expected:?}, got {found:?})")]& InvalidHeader {' expected: String,' found: String,d' },',) #[error("Missing attribute: {0}")]'# MissingAttribute(String),<( L(((PM - One-off error messages can be constructed using the `anyhow!` macro, which)DA supports string interpolation and produces an `anyhow::Error`.)L))%" # use anyhow::{anyhow, Result};<**! # fn demo() -> Result<()> {*  # let missing = "...";*<9 return Err(anyhow!("Missing attribute: {}", missing));+ # Ok(())L+L+++KH A `bail!` macro is provided as a shorthand for the same early return.,L,,# # use anyhow::{bail, Result};<,,!, ,.+ bail!("Missing attribute: {}", missing);-L-L--D--- # No-std support--NK In no_std mode, almost all of the same API is available and works the same.NK way. To depend on Anyhow in no_std mode, disable our default enabled "std"/:7 feature in Cargo.toml. A global allocator is required./\/ ```toml/ [dependencies]/:7 anyhow = { version = "1.0", default-features = false }<0 ```00PM With versions of Rust older than 1.81, no_std mode may require an additional1MJ `.map_err(Error::msg)` when working with a non-Anyhow error type inside a1PM function that returns Anyhow's error type, as the trait that `?`-based error2NK conversions are defined by is only available in std in those old versions.39https://docs.rs/anyhow/1.0.104l3 !hG H G F E C #A @ #? u> g = ,< .; : .9 >!A!D!<;!<0!l<L< L7'|#|~L    *  8$  8'8L'8L'8capture<  %  |3>    , 8err& 8$*  8L   % \B ܗ4\B  8 8$ 8$ 8*,L<,< D$ $x= ~C ,-4  -D  |vTk|9 NM8,/7& %$#!rH GFECd| ,7Ք 66  @6B  head$ 6QQQL$($ 6řǙșəʙ˙G*R{9 Q6B   $ -L  6~B   $  &|    , 786P -L  6řǙșəʙ˙G*R{9 Q6B  8$ $86Q 6~B  8$| ,786  <6B 8\<<<-WX`d!"l<,!$*,5!% D<!& InfallibleTZ!'$vc!)q,|g!*qg!*u<g!+Write,f!,,$KLjwpkmMO9;<!/-."l-.$*-.%-.'c-.)qg-.*qg-.*ug-.+f-., --.4W-.X-.<#`-.,D///!000j\Q7B/11/Q gQ<Q$ Q$Q< 0Q$ <VXT| ,7337 7|7$ 7$7<7404GIj\7Q7B2552 <$$< 47Q) &);=7707j\797B68869 g9<9$ 9$9< 79K* T*PR]:;:; 8 /8l8$ 8$8<7<>><`b]_i<7WYB9==9W gW< W$  W$ W<  <88Wd, m,VX d 7\YB9?@?@9 \ < $ $ < #\\l #\\W  >88W\,/ 5/xzuw,<   # type T = ();,  # " use anyhow::{Context, Result};! fn maybe_get() -> Option {+( # const IGNORE: &str = stringify! {\ ...d # };Ԍ # unimplemented!(), } fn demo() -> Result<()> {63 let t = maybe_get().context("there is no T")?;+\d,<BB 8CEECi<8QYBADDA <$$< C8Q1 1;=d8gYBAFGFGA g <$$<#g\l#g\Q  E8Qg4 4uwrtKIJJI  <g8,9KgK/1464 9 ggg cg:cثq1ȡoBH H K98$7?MNMN  <9OgO "%'4 9 ggg cg:cثq1ȡoBL L O98$9[QRQR  <8D<9SS79<>54 9řǙșəʙ˙G*R{9  @BP P S98$AUU <:VV54 :řǙșəʙ˙G*R{9  @BT T V9$(9w !YY :R8ƒXZ9:Br9 !9:BWW X9`b !WW91\\ < :]g] <  : ggg cg:cثq1ȡoB[ [ ]9$ A".88;_f_"/L" ; oB^ "^ _88$" "#b`a"l`a$*`a%x`a'{c`a)q~g`a*qg`a*ug`a+f`a, U-`aW`aX`a``a \`a&,##4#bb#b#9dede # #l$7$gg $8 T=4=sy*, hi4%Ihj$=chlq,Cghmqghm,Jfhn MaybeUninit\aho xhp,ihqyhrdL17{}VeLrW\KL>t4LssSs ttt7 7Bss t$Avwwv< < g<,g<, 8ɖ$= = =8$=, =8,=& =8=, =8.$=& =8= = = =, = = =, =8$=& =8= = = = = =, = = =, =8:=& =8= =, = = =, =8Μ,=& =8= = = =, =8brace,=& =8=, = = =, =8=& =8= = = =, = = =, =8,=& =8= =, = = >, =8.$=& =8= >*> > ?, >8,>'>8t> > > > 8$>, >8,>, >8.$> > >, > > >, >8$> > > > > >, > > >, >8:> >, >8,>, > > >, >8Μ,> > > >, > > >, >8.$> >, > > >, >8.$> >% ? ? @8$?, ?8,?& ?8?, ?8.$?& ?8? ? ? ?, ? ? ?, ?8$?& ?8? ? ? ? ? ?, ? ? ?, ?8:?& ?8? ?, ? ? ?, ?8Μ,?& ?8? ? ? ? , ?8$?& ?8?, ?8?& ?8?, ? ? ?, ?8?& ?8? ?8$?8?, ? ? @, ?8.$?& ?8? @*@ @ A, @8,@'@8t@ @ @ A 7 @ @ @8$@, @8,@, @8.$@ @ @, @ @ @, @8$@ @ @ @ @ @, @ @ @, @8:@ @, @8$@, @8@, @ @ @, @8Μ,@ @ @ @, @ @ @, @8.$@ @, @ @ A, @8.$@ A% A A B8$A, A8,A& A8A, A8.$A& A8A A A A, A A A, A8$A& A8A A A A A A, A A A, A8:A& A8A A, A A A, A8Μ,A& A8A A A A , A8$A& A8A, A8,A& A8A, A A A, A8A& A8A A8$A A B, A B B, B8,B& B8B B, B B B, B8.$B& B8B B*B B C, B8,B'B8tB B B C 8ɖ$B, B8,B, B8.$B B B, B B B, B8$B B B C B B, B B B, B8:B B, B8$B, B8,B, B B C, B8Μ,B C C C, C C C, C8.$C C, C C C, C8.$C C% C C C8$C, C8,C& C8C, C8.$C& C8C C C C, C C C, C8$C& C8C C, C8Μ,C& C8C, C8C& C8C, C C C, C8.$C& C8C C*C C D, C8,C'D8tD D D D 8ɖ$D, D8,D, D8.$D D D, D D D, D8$D D, D8Μ,D, D8D, D D D, D8.$D D% D D E7 D, D8,D& D8D, D8.$D& E8E E E E, E E E, E8$E& E8E E E E E E, E E E, E8:E& E8E E, E E E, E8Μ,E& E8E E E E, E8paren,E& E8E, E E E, E8E& E8E E E E, E E E, E8content Result { # unimplemented!()\ # }< # }, # use ffi::{Input, Output};,  use anyhow::{Error, Result};;8 use futures::stream::{Stream, StreamExt, TryStreamExt};63 async fn demo(stream: S) -> Result>L where  S: Stream,, {t streamDA .then(ffi::do_some_work) // returns Result  .map_err(Error::msg)ԉ .try_collect() .await,</\D7BD gD<gD,D$ D$D< D HZ\#QHE Construct an error object from a type-erased standard library error.A> This is mostly useful for interop with other error libraries.l # ExampleLI Here is a skeleton of a library that provides its own error abstraction.B? The pair of `From` impls provide bidirectional support for `?`41 conversion between `Report` and `anyhow::Error`.<&# use std::error::Error as StdError;! pub struct Report {/* ... */} impl From for ReportL E: Into,.+ Result<(), E>: anyhow::Context<(), E>,,# fn from(error: E) -> Self {;8 let anyhow_error: anyhow::Error = error.into();]Z let boxed_error: Box = anyhow_error.into();+( Report::from_boxed(boxed_error)L },)& impl From for anyhow::Error {)& fn from(report: Report) -> Self {]Z let boxed_error: Box = report.into_boxed();2/ anyhow::Error::from_boxed(boxed_error)L, impl Report {WT fn from_boxed(boxed_error: Box) -> Self { todo!()LJG fn into_boxed(self) -> Box { L ,  !52 // Example usage: can use `?` in both directions.!" fn a() -> anyhow::Result<()> {l! b()?;t! Ok(()),""" fn b() -> Result<(), Report> {l" a()?;t","<"|" ##","7/\#T#>7B  boxed_error\#%|% %%%,%7%7S7B &D&$&$&<&dImI57++DS7B ,<,,,$,$,<, MM=?-d-44DS7B 5<5$5$5<5 D PP:<5d6>|= ===,=7>98S7B  > >S7B ,GLHHTHRLR7 S7 RDS$S$SgaY1. Wrap the error value with additional context.YY@= For attaching context to a `Result` as it is propagated, theZKH [`Context`][crate::Context] extension trait may be more convenient thanZ this function.[[=: The primary reason to use `error.context(...)` instead of[IF `result.context(...)` via the `Context` trait would be if the context\>; needs to depend on some data held by the underlying error:\<\]+( # use std::fmt::{self, Debug, Display};,]],]].+ # impl std::error::Error for ParseError {}^! # impl Debug for ParseError {^HE # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {_\_ֳ<__# # impl Display for ParseError {_H`\`ֳ<`,`a use anyhow::Result;a use std::fs::File;ĸa use std::path::Path;aa struct ParseError {a line: usize,b column: usize,,bbb85 fn parse_impl(file: File) -> Result {b+\cdcc,ccc74 pub fn parse(path: impl AsRef) -> Result {d&# let file = File::open(&path)?;d*' parse_impl(file).map_err(|error| {e" let context = format!(e:7 "only the first {} lines of {} are valid",e41 error.line, path.as_ref().display(),tf );f63 anyhow::Error::new(error).context(context)Tg }),g Option {$! for cause in error.chain() {GD if let Some(io_error) = cause.downcast_ref::() {-* return Some(io_error.kind());l }Ld̀ None,ހ<| ,7,Á 73ezB Ɂ $ʁ5EB The lowest level cause of this error — this error's cause's cause's cause etc.@= The root cause is the last error in the iterator produced byу [`chain()`][Error::chain].| ,7T 7 @B  $YɅ>; Returns true if `E` is the type held by this error object.HE For errors with context, this method returns true if `E` matches theEB type of the context `C` **or** the type of the error on which theHE context has been attached. For details about the interaction between(% context and downcasting, [see here].41 [see here]: crate::Context#effect-on-downcasting 7B  g7<g7,$$< 7$PRm<9 Attempt to downcast the error object to a concrete type.DĊ7B ͊<,$$< 7$ԊBDi̒,) Downcast this error object by reference.l<̫ # use anyhow::anyhow;ɓ$! # use std::fmt::{self, Display}; # use std::task::Poll;, # #[derive(Debug)]ܶ # enum DataStoreError {֔ # Censored(()),<,'$ # impl Display for DataStoreError {H\ֳ<,ʖ2/ # impl std::error::Error for DataStoreError {},&# # const REDACTED_CONTENT: () = ();,! # let error = anyhow!("..."); # let root_cause = &error;,| # let ret =LI // If the error was caused by redaction, then return a tombstone instead // of the content.74 match root_cause.downcast_ref::() {ϙOL Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)),ܣ None => Err(error),,Ú<͚ # ;<ٚd 7řǙșəʙ˙G*R{9  7B  <,$$<ƛϵ$=?q41 Downcast this error object by mutable reference.d 7řǙșəʙ˙G*R{9  7B  <,$ş$̟<ӟ 7$BDNۢ52 Convert to a standard library error trait object.IF This is implemented as a cheap pointer cast that does not allocate orJG deallocate memory. Like [`anyhow::Error::from_boxed`], it's useful for'$ interop with other error libraries.,) The same conversion is also available asSP impl From<anyhow::Error>A> for Box<dyn Error + Send + Sync + 'static>.ŦLI If a backtrace was collected during construction of the `anyhow::Error`,HE that backtrace remains accessible using the standard library `Error`IF trait's provider API, but as a consequence, the resulting boxed error>; can no longer be downcast to its original underlying type.<Ե# _ = stringify! {֩,) #![feature(error_generic_member_access)] use anyhow::anyhow;" use std::backtrace::Backtrace;Ҫ use thiserror::Error; #[derive(Error, Debug)] #[error("...")] struct MyError;ȫЫ(% let anyhow_error = anyhow!(MyError);?< println!("{}", anyhow_error.backtrace()); // has BacktraceOL assert!(anyhow_error.downcast_ref::().is_some()); // can downcast>; let boxed_dyn_error = anyhow_error.into_boxed_dyn_error();a^ assert!(std::error::request_ref::(&*boxed_dyn_error).is_some()); // has BacktraceƮ\Y assert!(boxed_dyn_error.downcast_ref::().is_none()); // can no longer downcast4گdԯ# };<30 [`anyhow::Error::from_boxed`]: Self::from_boxed| ҰѰ,7/\7>B $z۳5֊C@ Unlike `self.into_boxed_dyn_error()`, this method relocates theKH underlying error into a new allocation in order to make it downcastableC@ to `&E` or `Box` for its original underlying error type. AnyEB backtrace collected during construction of the `anyhow::Error` istǶ discarded.ڶ<̛# _ = stringify!{,"̷ոݸ(?ߔO[X let boxed_dyn_error = anyhow_error.reallocate_into_boxed_dyn_error_without_backtrace();b_ assert!(std::error::request_ref::(&*boxed_dyn_error).is_none()); // Backtrace lostɼ^[ assert!(boxed_dyn_error.downcast_ref::().is_some()); // can downcast to &MyError\Y assert!(boxed_dyn_error.downcast::().is_ok()); // can downcast to Box4d<;| ,پ7/\17>B $H| ,7 D$$<779$77B 75m| ,77""\4> , 7 "7B  $| ,77",L 7 B  $7g< 7 ggg cg:cثq1ȡoB  $L7g< 7 ggg cg:cثq1ȡoB  $L7#$ 7\B  $\06e;&\֔RT% Nݥ v% Nݥ >T| ,7dv>_| ,7E|% Nݥ vřǙșəʙ˙G*R{9 % Nݥ \3Aܺ|3>% Nݥ vřǙșəʙ˙G*R{9  P+\v\ ΔdnAv\ cpnpT% Nݥ v% Nݥ >  D$$<r35| ,7dv> D$$<^t35| ,7v> D$$<x35h|% Nݥ vřǙșəʙ˙G*R{9 % Nݥ \  <N|Y|!8ܕ|3>d% Nݥ vřǙșəʙ˙G*R{9  PB  || ,7% Nݥ vřǙșəʙ˙G*R{9 % Nݥ \   <<ϩ1357j| ,7v\  <<1357o% Nݥ vřǙșəʙ˙G*R{9 % Nݥ \  <6A!]v\ <؀bm!]ܧ즈|ň3>% Nݥ vřǙșəʙ˙G*R{9  P  <щ#L4=Z"" \䪍4̍L̍STَ<َ7?4͹ ǒ$dْ  901@)+-/t<9d,8 =  !, =% Nݥ vB $tŕvڕV,% Nݥ v > wthis$^| ,7L& Uj;@oUv > Ƙ $=|L% Nݥ v P $\U y4,% Nݥ v3ez ǣ $8 Dä=Ӥ54֤ =řǙșəʙ˙G*R{9  @B ݤ 7$ޤ2 ,=g< = ggg cg:cثq1ȡoB  7$6 <=g< = ggg cg:cثq1ȡoB  7$>| ,7>쌫$7>B ,7| ,ګ7?ܬ$߬7?B ,0| ɭȭ,7@쥮$7@B ,0| ,77;4 7 >B  $"|ð ذװ°,77-4 7 @B  $7䀲7<==,L+%F$[cq,agqg,hf||:mLO^UPR,.tqvT<% Nݥ v ggg cg:cثq1ȡo  $ R,% Nݥ v ggg cg:cثq1ȡo $  D  | D       ZC ZC,  4l<58A fA,Af!#/L A oB  8A$%D=$=*, q, gqgu< g D =d L qsNP| |    , 7j|   , 7,bװбJ-)t4L, \ B  $R8A4gA<gA,A$ A$A<A TfD7B <,$$< D AC,MOA-)Ԇt4L, \ B  $, 77\7TH77B \ 7!#| ,7,?(0V)Ժ| ,7t4L, \ B  $2| ,7>T| ,7A>7B $,T=4= D    , 84 & 8$ *   4<< Return early with an error if a condition is not satisfied. ? < < This macro is equivalent to  <G if !$cond { return Err([anyhow!($args\...)][anyhow!]); }.J < <G The surrounding function's or closure's return value is required to beJ <= Result<_, [anyhow::Error][crate::Error]>.@ < <M Analogously to `assert!`, `ensure!` takes a condition and exits the functionP <G if the condition fails. Unlike `assert!`, `ensure!` returns an `Error`J < rather than panicking. < < [anyhow!]: crate::anyhow < <l < << < # use anyhow::{ensure, Result};# <, < # fn main() -> Result<()> { < # let user = 0; <, <. ensure!(user == 0, "only user 0 is allowed");1 < # Ok(()) << << < << <# < # use thiserror::Error;ܴ <, < # const MAX_DEPTH: usize = 1;! <, <ܞ < enum ScienceError { <) #[error("recursion limit exceeded")], < RecursionLimitExceeded, < # #[error("...")]̿ < # More = (stringify! { <\ < # }, 1).1, <, < < < # let depth = 0; <, <C ensure!(depth <= MAX_DEPTH, ScienceError::RecursionLimitExceeded);F < << << ,  84 %  3 t3 43 )|3 ? 3 7   3 3 , 3 83 & 3 8<3 , 3  3 3 $ 3 - 3 *3  3 4  3 4  84 8,4 4 , 4 8,4 '4 8+L4 '4 8,T4  4 4 , 4 8,4 '4 8+L4 '4 8\4  4  4 4 , 4 84 % 4 8,4 % 4  4 5 , 4 84 & 4 8$4 , 4  5 5 $ 5 - 5 *5  5 6  5 6 8#5 , 5 8,5 '5 8+L5 '5 8$5 '5  5 % 5 85 8,5 5 8,5 , 5 85  5 6  8,5 *5  5 5  5 8,5  5 8!\5  5 5  6 8 6  6 6 8,6 $ 6 % 6 8,6 % 6  6 6 , 6 86 & 6 8$6 $ 6 , 6  6 6 , 6 86 & 6 86  6 *6  6 7 , 6 8,6 '6 8*,6 '6 86  6 7 , 6 8,6 '6 8+L6 '6 8format46  7  7 7 , 7 87 $ 7 , 7  7 7 , 7 87  7 % 7 <=== \) !!EBm3>EB  #>̩ |    , 7Eg 4  E ggg cg:cثq1ȡoB  $   |    , 7Eg 4  E ggg cg:cثq1ȡoB  $   |    , 7E 54  EřǙșəʙ˙G*R{9  @B  $ >O|>cȔ>vȌ?|??4AALAȄ[B<9 The `Error` type, a wrapper around a dynamic error type.BBIF `Error` works a lot like `Box`, but with theseC differences:CCGD - `Error` requires that the error is `Send`, `Sync`, and `'static`.CNK - `Error` guarantees that a backtrace is available, even if the underlyingD&# error type does not provide one.DLI - `Error` is represented as a narrow pointer — exactly one word inԿE size instead of two.EDEEE # Display representationsFFPM When you print an error object using "{}" or to_string(), only the outermostFNK underlying error or context is printed, not any of the lower level causes.GKH This is exactly as if you had called the Display impl of the error fromG-* which you constructed your anyhow::Error.HtH ```consoleH41 Failed to read instrs from ./path/to/instrs.json; from `fn main` instead of printing it explicitly yourself.LtLL;8 Error: Failed to read instrs from ./path/to/instrs.jsonMtM Caused by:M.+ No such file or directory (os error 2)::ext_contextO30 at /git/anyhow/src/backtrace.rs:26P,) 1: core::result::Result::map_errP85 at /git/rustc/src/libcore/result.rs:596Qb_ 2: anyhow::context:: for core::result::Result>::with_contextQ1. at /git/anyhow/src/context.rs:58R 3: testing::mainR! at src/main.rs:5R 4: std::rt::lang_startR2/ at /git/rustc/src/libstd/rt.rs:61tS 5: mainܺS 6: __libc_start_mainS 7: _start Result<()> {Z+\ZdZZ # Ok(()),Z<[,[70kQO[,[vj` `Result```PM This is a reasonable return type to use throughout your application but alsoaEB for `fn main`; if you do, failures will be printed along with anya;8 [context][Context] and a backtrace if one was captured.bbC@ `anyhow::Result` may be used with one *or* two type parameters.b\b ```rustbcc'$ # const IGNORE: &str = stringify! {c! fn demo1() -> Result {...}cGD // ^ equivalent to std::result::Resultdd-* fn demo2() -> Result {...}dDA // ^ equivalent to std::result::ResultDe # };(json: &str) -> io::Result {g\gֳ Result<()> {h # return Ok(());h>; let config = std::fs::read_to_string("cluster.json")?;i=: let map: ClusterMap = serde_json::from_str(&config)?;i-* println!("cluster info: {:#?}", map);tj,j Result<()> {...}dnn.+ # fn detach(&mut self) -> Result<()> {o # unimplemented!()\o # },ooo=: pub fn do_it(mut it: ImportantThing) -> Result> {oEB it.detach().context("Failed to detach the important thing")?;pp let path = &it.path;p$! let content = fs::read(path)qXU .with_context(|| format!("Failed to read instrs from {}", path.display()))?;qq Ok(content),q Result<()> {~%" # bail!(SuspiciousError);\~L~߃~&# use anyhow::{Context, Result};~~" fn do_it() -> Result<()> {=: helper().context("Failed to complete the work")?;/, # const IGNORE: &str = stringify! {| ... # };䰀 # unreachable!()L̀׀ۀ fn main() {+( let err = do_it().unwrap_err();DA if let Some(e) = err.downcast_ref::() {KH // If helper() returned SuspiciousError, this downcast willFC // correctly succeed even with the context in between. # return;l52 # panic!("expected downcast to succeed");Lу\ۃMJ - **Attaching context whose type is used in downcasts onto errors whose  type is insignificant.**ڄބKH Some codebases prefer to use machine-readable context to categorizeOL lower level errors in a way that will be actionable to higher levels of the application.\ܣL߆߃!̋ # struct HelperFailed;Lć߃·%1. # bail!("no such file or directory");\L߃&",) helper().context(HelperFailed)?;/|ׇ䈊LˈNJ+A> if let Some(e) = err.downcast_ref::() {GD // If helper failed, this downcast will succeed becauseHE // HelperFailed is the context that has been attached toƌ // that error.l5ƋLÍ\͍<ٍb  J>VJVXOQǎi1<ʎÜĜŜƜǜȜ_wA7B Ҏg<$ $< A$Վ <ێjlIF Wrap the error value with additional context that is evaluated lazily" only once an error does occur.dB  ƙ<י$$<#\l#\  A$ ǐ#2/ Equivalent to `Ok::<_, anyhow::Error>(value)`.HE This simplifies creation of an `anyhow::Result` in places where typeNK inference cannot deduce the `E` type of the result — without needing-* to write `Ok::<_, anyhow::Error>(value)`.MJ One might think that `anyhow::Result::Ok(value)` would work in such cases but it does not.tKH error[E0282]: type annotations needed for `std::result::Result` --> src/main.rs:11:13D |+( 11 | let _ = anyhow::Result::Ok(1);ȕnk | - ^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `E` declared on the enum `Result` | |ʖ | consider giving this pattern the explicit type `std::result::Result`, where the type parameter `E` is specified<ӗ8YB  8it4LX$*,ՙ,LLsdyȏ4Ɯǜ4Л\؛L|dTΙ٤lt4# B?ltƚ4̏̚t40$ɛt42$!P?EB]Lfcjdt4$!L͜"L؜"Lٝ\t4\# yhB?̝| ,7t4+t4Tȃccg@# 7BL &t4/\D77B #t4B-L$ u')<Ѣբtt4$<"B $B ŜŤ8FFB 8QT 5iݓe*q5*$řǙșəʙ˙G*R{9 | ,751$??I?:=?J=?J=?=? =?=_O >$" 5wz$$ 55B  $   Return early with an error. $ D; 8 return Err([anyhow!($args\...)][anyhow!]). J @    l  < !  # use anyhow::{bail, Result};, ? < # fn has_permission(user: usize, resource: usize) -> bool {t # true< ,   ܌  # let resource = 0;, ( % if !has_permission(user, resource) {> ; bail!("permission denied for accessing {}", resource);,  < <  < !  , ! , ܵ  փ,  ̶ Մ \  ,   ĸ ,   if depth > MAX_DEPTH {4 1 bail!(ScienceError::RecursionLimitExceeded);,  < <  )|    , 8 & 8< ,  $ - *  84 , 8, ' 8+L ' 8  , 8, ' 8#D   , 8 %  , 8 & 8$ ,  $ - *  84 , 8, ' 8+L ' 8  , 8, ' 8#D   , 8 %  , 8 & 8$ $ ,  , 8 & 8  *  84 , 8, ' 8+L ' 8  , 8, ' 8#D   , 8 $ ,  , 8  % " 1 ? 1 1  1J 1 1J 1@ 1 1P 1J 1 1 1 1 h1 1 81 1# (1 1 1 (1 11 ˁ1 81 81 1 81 1# 1 (1 1! (1 1 1 փ1, 1 1 Մ1 X1 1 (1 1 1 1 (1 1F 1 81 81 " )|!  " &  " " , "  " " , " 8" & " 8"  " *"  " % , " 8," '" 8t"  "  " % 7 #  # #  # # , #  # # , # 8#  #  # $ x #  #  #  #  #  #  #  #  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $ $  $  $  $  $  $  $  $  $  $  % %  % %  % % , %  % % , % 8%  % , %  % % , % 8%  % % % - &J G Construct an ad-hoc error from a string or existing non-`anyhow` errorT&  value.& &K H This evaluates to an [`Error`][crate::Error]. It can take either just a'O L string, or a format string with arguments. 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