93 lines
33 KiB
Plaintext
93 lines
33 KiB
Plaintext
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!<arch>
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/ 0 0 0 0 8 `
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// 68 `
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thiserror-39e83342e6d9ed26.thiserror.862e90a981104351-cgu.0.rcgu.o/
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lib.rmeta/ 0 0 0 644 32736 `
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ELF · `~ @ @ GNU À rust
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÷{ #rustc 1.96.0 (ac68faa20 2026-05-25)ÁíàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ À뉊 ]!ÜÛê(¹Þ—šên -5be7b69c3ff7b5b8Á ¤²XctÔ'ÐÓ©z¨É½Ó -a4945860e1c53b00Á ¤°ð ¾ä-±($²ï=©Ã -7e98a21bfd32b0edÁ–�òÖÀH•‘P IÓHã#£ -055f30b747f859b6Á rustc_std_workspace_coreÁCçß^ò½èÝ$Çÿ+Cé -c4878ee60b2242c9Á ŸÃï+Ñ]ŠqB<ÏïW# -8dd1dd90e70d0b6aÁ miniz_oxideÁ€š»J(P>àö÷g\K -1eb618da2918ab7fÁ adler2ÁÆ;+Þ®5¥ÌýÝ°¦ÛLˆ -f7919172d268e069Á hashbrownÁPäV9ÒÆèÜ�"ÊÖVŽ\ -0fc2184a5da6723aÁ rustc_std_workspace_allocÁs&ØòØy¯s•bæ!‰ýŠ -97e4bf30be240674Á
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std_detectÁhŠBîÙºÌI®Ë�Å�š -9dbbf8346ba7ac8bÁ rustc_demangleÁûë9´Ç×@Œ�’ùXFº -f33013f239bf9f14Á cfg_ifÁÜLh�ž§Œaã¯>� -0a71c8f33a838301Á addr2lineÁ׎Þ!]8V$É@@T· -e618e6be60e87ba2Á gimliÁ¸
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ýáëà ã ýû¹(^ ¿0 LÇ Y õ U • d« Ü Dž �# ‚Õ" Í ô! �º ±! Î ±! Ïö Ì¥! ´¶ È Õ" ö! %Ö ¯� ¬ u j 4Û ¦ üÎ
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ŸÈŸÈ È ErrorÁ O˜éBL \¸ B B C³ Fˆ ¸Sý‹g Y ë ,Ž c c ˆ ¢cµ
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` £c€ ` àB¤GS
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L• ¦ N W formatterÁ( : ¤)€ ì! B ë C ' æ* 2 ¦ 9 @ ">LRí À ¸E í$éE Á)ý×6 › Kü ¡G ü š — [![github]](https://github.com/dtolnay/thiserror) [![crates-io]](https://crates.io/crates/thiserror) [![docs-rs]](https://docs.rs/thiserror)Á ›ú 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 çú Dë <br>Á ôú üøN K This library provides a convenient derive macro for the standard library'sÁ üÇ [`std::error::Error`] trait.Á èú Dìô0 õú lù
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# ExampleÁ ‡ú \‹ ```rustÁ ”— # use std::io;Á ̪ use thiserror::Error;Á Äú ÜÈ #[derive(Error, Debug)]Á ìä pub enum DataStoreError {Á ü‚+ ( #[error("data store disconnected")]Á ü®& # Disconnect(#[from] io::Error),Á üÕ; 8 #[error("the data for key `{0}` is not available")]Á Ô‘ Redaction(String),Á ü¬K H #[error("invalid header (expected {expected:?}, found {found:?})")]Á ¼ø InvalidHeader {Á ì� expected: String,Á Ô® found: String,Á TÉ },Á üÔ, ) #[error("unknown data store error")]Á „�
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Unknown,Á ,’ }Á <˜ ```Á ú D¤ ô0 ú l±
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# DetailsÁ ¿ ú üà L I - Thiserror deliberately does not appear in your public API. You get theÁ ü�
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; 8 same thing as if you had written an implementation ofÁ üÌ
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L I [`std::error::Error`] by hand, and switching from handwritten impls toÁ ü™ 7 4 thiserror or vice versa is not a breaking change.Á Ñ ú üÕ L I - Errors may be enums, structs with named fields, tuple structs, or unitÁ t¢ structs.Á ± ú üµ C @ - A [`Display`] impl is generated for your error if you provideÁ üù O L `#[error("...")]` messages on the struct or each variant of your enum, asÁ üÉ
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! shown above in the example.Á ë
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ú üï
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O L The messages support a shorthand for interpolating fields from the error.Á ¿ú üÃD A - `#[error("{var}")]` ⟶ `write!("{}", self.var)`Á üˆ@ = - `#[error("{0}")]` ⟶ `write!("{}", self.0)`Á üÉH E - `#[error("{var:?}")]` ⟶ `write!("{:?}", self.var)`Á ü’D A - `#[error("{0:?}")]` ⟶ `write!("{:?}", self.0)`Á ×ú üÛL I These shorthands can be used together with any additional format args,Á ü¨6 3 which may be arbitrary expressions. For example:Á ßú lã
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```rustÁ ´ñ # use core::i32;Á ìˆ # use thiserror::Error;Á <¦ #Á ì® #[derive(Error, Debug)]Á ´Ì pub enum Error {Á üãY V #[error("invalid rdo_lookahead_frames {0} (expected < {max})", max = i32::MAX)]Á ü½ InvalidLookahead(u32),Á <Þ }Á Læ ```Á ðú üôP M If one of the additional expression arguments needs to refer to a field ofÁ üÅO L the struct or enum, then refer to named fields as `.var` and tuple fieldsÁ t• as `.0`.Á ¤ú l¨°B ì¶åB <Ô‹C üÜ+ ( # fn first_char(s: &String) -> char {Á üˆ% " # s.chars().next().unwrap()Á L® # }Á <¸‹C ÄÀ # #[derive(Debug)]Á ¼Ù # struct Limits {Á ´ñ # lo: usize,Á ´ˆ # hi: usize,Á LŸùG <©‹C ì±›C ´ÏÁC üæQ N #[error("first letter must be lowercase but was {:?}", first_char(.0))]Á ä¸ WrongCase(String),Á üÕf c #[error("invalid index {idx}, expected at least {} and at most {}", .limits.lo, .limits.hi)]Á ü¼5 2 OutOfBounds { idx: usize, limits: Limits },Á <òíD LúýD „ú üˆM J - A [`From`] impl is generated for each variant that contains a `#[from]`Á „Ö
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attribute.Á çú üëN K The variant using `#[from]` must not contain any other fields beyond theÁ üºH E source error (and possibly a backtrace — see below). UsuallyÁ üƒ M J `#[from]` fields are unnamed, but `#[from]` is allowed on a named fieldÁ TÑ too.Á Ü ú là °B üî ' $ # use core::fmt::{self, Display};Á ¤– # use std::io;Á ì« åB <É ‹C ¬Ñ # mod globset {Á üç . + # #[derive(thiserror::Error, Debug)]Á Ü– # #[error("...")]Á ì² # pub struct Error;Á LÐ ùG <Ú ‹C ìâ ›C Ä€ pub enum MyError {Á ü™ Io(#[from] io::Error),Á üº ' $ Glob(#[from] globset::Error),Á <â íD <ê ‹C üò " # impl Display for MyError {Á ü• J G # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {Á üà # unimplemented!()Á l�!
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# }Á L�!ùG L™!ýD £!ú ü§!N K - The Error trait's [`source()`] method is implemented to return whicheverÁ üö!M J field has a `#[source]` attribute or is named `source`, if any. This isÁ üÄ"N K for identifying the underlying lower level error that caused your error.Á “#ú ü—#P M The `#[from]` attribute always implies that the same field is `#[source]`,Á üè#8 5 so you don't ever need to specify both attributes.Á ¡$ú ü¥$P M Any error type that implements `std::error::Error` or dereferences to `dynÁ üö$/ , std::error::Error` will work as a source.Á ¦%ú lª%°B ü¸%'ÂO ìà%åB <þ%‹C ì†&›C Ô¤& pub struct MyError {Á ´¿& msg: String,Á üÖ&: 7 #[source] // optional if field name is `source`Á ü‘' source: anyhow::Error,Á <²'íD <º'‹C üÂ'"€S üå'J¬S ü°( €T lÑ(©T Lß(ùG Lé(ýD ó(ú ü÷(P M - The Error trait's [`provide()`] method is implemented to provide whicheverÁ üÈ)6 3 field has a type named `Backtrace`, if any, as aÁ üÿ)K H [`std::backtrace::Backtrace`]. Using `Backtrace` in errors requires aÁ üË*7 4 nightly compiler with Rust version 1.73 or newer.Á ƒ+ú l‡+°B ü•+) & # const IGNORE: &str = stringify! {Á ü¿+$ ! use std::backtrace::Backtrace;Á ä+ú ìè+›C Ô†,úY ´¡,�Z ü¸,: 7 backtrace: Backtrace, // automatically detectedÁ <ó,íD Tû, # };Á L†-ýD �-ú ü”-H E - If a field is both a source (named `source`, or has `#[source]` orÁ üÝ-I F `#[from]` attribute) *and* is marked `#[backtrace]`, then the ErrorÁ ü§.L I trait's [`provide()`] method is forwarded to the source's `provide` soÁ üô.P M that both layers of the error share the same backtrace. The `#[backtrace]`Á üÅ/L I attribute requires a nightly compiler with Rust version 1.73 or newer.Á ’0ú l–0°B ü¤0)â^ ìÎ0›C Äì0ëQ t…1 Io {Á Ô”1 #[backtrace]Á ü¯1 source: io::Error,Á dÐ1 },Á <Ý1íD Tå1Â` Lð1ýD ú1ú üþ1M J - For variants that use `#[from]` and also contain a `Backtrace` field, aÁ üÌ28 5 backtrace is captured from within the `From` impl.Á …3ú l‰3°B ü—3)â^ ìÁ3›C Äß3ëQ tø3Õd ¬‡4 #[from]Á ü�4 �e ü¾4# backtrace: Backtrace,Á dâ4¹e <ï4íD T÷4Â` L‚5ýD Œ5ú ü�5O L - Errors may use `error(transparent)` to forward the source and [`Display`]Á üà5G D methods straight through to an underlying error without adding anÁ ü¨6J G additional message. This would be appropriate for enums that need anÁ ôó6 "anything else" variant.Á ’7ú L–7ýD ì 7åB <¾7‹C ìÆ7›C Ää7ëQ tý7 # /*Á lŒ8
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...Á tš8 # */Á ©8ú ü8 #[error(transparent)]Á üÍ8X U Other(#[from] anyhow::Error), // source and Display delegate to anyhow::ErrorÁ <¦9íD L®9ýD ¸9ú ü¼9C @ Another use case is hiding implementation details of an errorÁ ü€:O L representation behind an opaque error type, so that the representation isÁ üÐ:= : able to evolve without breaking the crate's public API.Á Ž;ú L’;ýD ìœ;åB <º;‹C üÂ;G D // PublicError is public, but opaque and easy to keep compatible.Á ìŠ<›C ܨ< #[error(transparent)]Á üÄ<0 - pub struct PublicError(#[from] ErrorRepr);Á õ<ú Äù< impl PublicError {Á ü’=B ? // Accessors for anything we do want to expose publicly.Á <Õ=íD Ý=ú üá=F C // Private and free to change across minor version of the crate.Á ì¨>›C ´Æ> enum ErrorRepr {Á tÝ>ák lì>øk tú>Žl <‰?íD L‘?ýD ›?ú üŸ?O L - See also the [`anyhow`] library for a convenient single error type to useÁ Ôï? in application code.Á Š@ú üŽ@1 . [`anyhow`]: https://github.com/dtolnay/anyhowÁ üÀ@+ ( [`source()`]: std::error::Error::sourceÁ üì@- * [`provide()`]: std::error::Error::provideÁ üšA" [`Display`]: std::fmt::DisplayÁ https://docs.rs/thiserror/2.0.18ÁlÐA ">LRí À í" Á)4 › K „«EÄÕE"\ðE <ôE Á), ¾
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