70 lines
26 KiB
Plaintext
70 lines
26 KiB
Plaintext
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!<arch>
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// 68 `
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thiserror-b5f17e12eddf1d5a.thiserror.8be34371120ed520-cgu.0.rcgu.o/
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lib.rmeta/ 0 0 0 644 25976 `
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asm linking áÊ.rmetarust
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¾c #rustc 1.90.0 (1159e78c4 2025-09-14)Á®‘K:k VQÛ‘å÷Ú†
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-896f64118b892ee1Á ˜ø½E—y88àìOg[ -a0f3a77406fcd134Á Ù$î„xÁLòd ƒCøm Q1 -d07b5e2c2a0f2336Á ÒµÅL ®Ùp,ØnWš÷*�Ó -eed239b623db52f0Á’ Êï#|Ø°*�ªuz�¥zÑ -22622f072d82cf02Á rustc_std_workspace_coreÁ¡Lˆ"'WycÈú®¨Ç?˜ -62776efff7f53db8Á �/»óoÊ•�Ú<ã] õ -c656a6ce8faf7d92Á cfg_ifÁNgpÝiä5R-z#ë~· -a28c175c29d7456aÁ miniz_oxideÁ'&=ÝTÒ4B1K8Ý=ïx -99a9ab44d6ca7927Á adler2ÁdR¯Š³Y^Ø÷v˜z¸ê -6814a63e25073aa9Á hashbrownÁøOvtÊ(äSÿídRœi è -a938d680cd164e6dÁ rustc_std_workspace_allocÁ”–«cÒXdŸEÁ¨:dn, -60b329376530a3eeÁ
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ÐÈ éè$A $A® “ýç6 È @ü žG ü š — [![github]](https://github.com/dtolnay/thiserror) [![crates-io]](https://crates.io/crates/thiserror) [![docs-rs]](https://docs.rs/thiserror)Á › © üŸj g [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=githubÁ üŠn k [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rustÁ üùm j [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rsÁ ç © Dë <br>Á ô © üøN K This library provides a convenient derive macro for the standard library'sÁ üÇ [`std::error::Error`] trait.Á è © üìO L [`std::error::Error`]: https://doc.rust-lang.org/std/error/trait.Error.htmlÁ ¼ © DÀ Š) É © lÍ
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# ExampleÁ Û © \ß ```rustÁ ”ë # use std::io;Á Ìþ use thiserror::Error;Á ˜ © Üœ #[derive(Error, Debug)]Á ì¸ pub enum DataStoreError {Á üÖ+ ( #[error("data store disconnected")]Á ü‚& # Disconnect(#[from] io::Error),Á ü©; 8 #[error("the data for key `{0}` is not available")]Á Ôå Redaction(String),Á ü€K H #[error("invalid header (expected {expected:?}, found {found:?})")]Á ¼Ì InvalidHeader {Á ìä expected: String,Á Ô‚ found: String,Á T� },Á ü¨ , ) #[error("unknown data store error")]Á „Õ
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Unknown,Á ,æ }Á <ì ```Á ô © Dø Š) �
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# DetailsÁ “
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© ü—
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L I - Thiserror deliberately does not appear in your public API. You get theÁ üä
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O L same thing as if you had written an implementation of `std::error::Error`Á ü´ N K by hand, and switching from handwritten impls to thiserror or vice versaÁ üƒ is not a breaking change.Á £ © ü§ L I - Errors may be enums, structs with named fields, tuple structs, or unitÁ tô structs.Á ƒ
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© ü‡
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A > - A `Display` impl is generated for your error if you provideÁ üÉ
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O L `#[error("...")]` messages on the struct or each variant of your enum, asÁ ü™! shown above in the example.Á » © ü¿O L The messages support a shorthand for interpolating fields from the error.Á � © ü“D A - `#[error("{var}")]` ⟶ `write!("{}", self.var)`Á üØ@ = - `#[error("{0}")]` ⟶ `write!("{}", self.0)`Á ü™H E - `#[error("{var:?}")]` ⟶ `write!("{:?}", self.var)`Á üâD A - `#[error("{0:?}")]` ⟶ `write!("{:?}", self.0)`Á § © ü«L I These shorthands can be used together with any additional format args,Á üø6 3 which may be arbitrary expressions. For example:Á ¯ © l³
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```rustÁ ´Á # use core::i32;Á ìØ # use thiserror::Error;Á <ö #Á ìþ #[derive(Error, Debug)]Á ´œ pub enum Error {Á ü³P M #[error("invalid rdo_lookahead_frames {0} (expected < {})", i32::MAX)]Á ü„ InvalidLookahead(u32),Á <¥ }Á L ```Á · © ü»P M If one of the additional expression arguments needs to refer to a field ofÁ üŒO L the struct or enum, then refer to named fields as `.var` and tuple fieldsÁ tÜ as `.0`.Á ë © lï î: ìý ¡; <› Æ; ü£+ ( # fn first_char(s: &String) -> char {Á üÏ% " # s.chars().next().unwrap()Á Lõ # }Á <ÿ Æ; ć # #[derive(Debug)]Á ¼ # struct Limits {Á ´¸ # lo: usize,Á ´Ï # hi: usize,Á Læ š@ <ð Æ; ìø Õ; ´– ú; üQ N #[error("first letter must be lowercase but was {:?}", first_char(.0))]Á äÿ WrongCase(String),Á üœf c #[error("invalid index {idx}, expected at least {} and at most {}", .limits.lo, .limits.hi)]Á üƒ5 2 OutOfBounds { idx: usize, limits: Limits },Á <¹ š= LÁ ©= Ë © üÏK H - A `From` impl is generated for each variant that contains a `#[from]`Á „›
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attribute.Á ¬ © ü°N K The variant using `#[from]` must not contain any other fields beyond theÁ üÿH E source error (and possibly a backtrace — see below). UsuallyÁ üÈ M J `#[from]` fields are unnamed, but `#[from]` is allowed on a named fieldÁ T– too.Á ¡ © l¥ î: ü³ ' $ # use core::fmt::{self, Display};Á ¤Û # use std::io;Á ìð ¡; <Ž Æ; ¬– # mod globset {Á ü¬ . + # #[derive(thiserror::Error, Debug)]Á ÜÛ # #[error("...")]Á ì÷ # pub struct Error;Á L• š@ <Ÿ Æ; ì§ Õ; ÄÅ pub enum MyError {Á üÞ Io(#[from] io::Error),Á üÿ ' $ Glob(#[from] globset::Error),Á <§ š= <¯ Æ; ü· " # impl Display for MyError {Á üÚ J G # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {Á ü¥! # unimplemented!()Á lÆ!
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# }Á LÔ! š@ LÞ! ©= è! © üì!L I - The Error trait's `source()` method is implemented to return whicheverÁ ü¹"M J field has a `#[source]` attribute or is named `source`, if any. This isÁ ü‡#N K for identifying the underlying lower level error that caused your error.Á Ö# © üÚ#P M The `#[from]` attribute always implies that the same field is `#[source]`,Á ü«$8 5 so you don't ever need to specify both attributes.Á ä$ © üè$P M Any error type that implements `std::error::Error` or dereferences to `dynÁ ü¹%/ , std::error::Error` will work as a source.Á é% © lí% î: üû%' ÇG ì£& ¡; <Á& Æ; ìÉ& Õ; Ôç& pub struct MyError {Á ´‚' msg: String,Á ü™': 7 #[source] // optional if field name is `source`Á üÔ' source: anyhow::Error,Á <õ' š= <ý' Æ; ü…(" õJ ü¨(J K üó( óK l”) ›L L¢) š@ L¬) ©= ¶) © üº)N K - The Error trait's `provide()` method is implemented to provide whicheverÁ ü‰*6 3 field has a type named `Backtrace`, if any, as aÁ üÀ*I F `std::backtrace::Backtrace`. Using `Backtrace` in errors requires aÁ üŠ+7 4 nightly compiler with Rust version 1.73 or newer.Á Â+ © lÆ+ î: üÔ+) & # const IGNORE: &str = stringify! {Á üþ+$ ! use std::backtrace::Backtrace;Á £, © ì§, Õ; ÔÅ, ×Q ´à, ùQ ü÷,: 7 backtrace: Backtrace, // automatically detectedÁ <²- š= Tº- # };Á LÅ- ©= Ï- © üÓ-H E - If a field is both a source (named `source`, or has `#[source]` orÁ üœ.I F `#[from]` attribute) *and* is marked `#[backtrace]`, then the ErrorÁ üæ.O L trait's `provide()` method is forwarded to the source's `provide` so thatÁ ü¶/K H both layers of the error share the same backtrace. The `#[backtrace]`Á ü‚0L I attribute requires a nightly compiler with Rust version 1.73 or newer.Á Ï0 © lÓ0 î: üá0) ¨V ì‹1 Õ; Ä©1 åI tÂ1 Io {Á ÔÑ1 #[backtrace]Á üì1 source: io::Error,Á d�2 },Á <š2 š= T¢2 €X L2 ©= ·2 © ü»2M J - For variants that use `#[from]` and also contain a `Backtrace` field, aÁ ü‰38 5 backtrace is captured from within the `From` impl.Á Â3 © lÆ3 î: üÔ3) ¨V ìþ3 Õ; Äœ4 åI tµ4 „\ ¬Ä4 #[from]Á üÚ4 ½\ üû4# backtrace: Backtrace,Á dŸ5 å\ <¬5 š= T´5 €X L¿5 ©= É5 © üÍ5K H - Errors may use `error(transparent)` to forward the source and DisplayÁ ü™6G D methods straight through to an underlying error without adding anÁ üá6J G additional message. This would be appropriate for enums that need anÁ ô¬7 "anything else" variant.Á Ë7 © LÏ7 ©= ìÙ7 ¡; <÷7 Æ; ìÿ7 Õ; Ä�8 åI t¶8 # /*Á lÅ8
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...Á tÓ8 # */Á â8 © üæ8 #[error(transparent)]Á ü†9X U Other(#[from] anyhow::Error), // source and Display delegate to anyhow::ErrorÁ <ß9 š= Lç9 ©= ñ9 © üõ9C @ Another use case is hiding implementation details of an errorÁ ü¹:O L representation behind an opaque error type, so that the representation isÁ ü‰;= : able to evolve without breaking the crate's public API.Á Ç; © LË; ©= ìÕ; ¡; <ó; Æ; üû;G D // PublicError is public, but opaque and easy to keep compatible.Á ìÃ< Õ; Üá< #[error(transparent)]Á üý<0 - pub struct PublicError(#[from] ErrorRepr);Á ®= © IJ= impl PublicError {Á üË=B ? // Accessors for anything we do want to expose publicly.Á <Ž> š= –> © üš>F C // Private and free to change across minor version of the crate.Á ìá> Õ; ´ÿ> enum ErrorRepr {Á t–? êb l¥? €c t³? •c <Â? š= LÊ? ©= Ô? © üØ?O L - See also the [`anyhow`] library for a convenient single error type to useÁ Ô¨@ in application code.Á Ã@ © üÇ@3 0 [`anyhow`]: https://github.com/dtolnay/anyhowÁÿ ÿ@ ‚A µA 8Ž lƒA ‘A 7 https://docs.rs/thiserror/1.0.69Á ü“A" üü@; $A®A “Q È @AAA\¡D <¥D
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