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RUSTFLAGS=${RUSTFLAGS}\ -Zrandomize-layout >> $GITHUB_ENV if: matrix.rust == 'nightly' - name: Enable nightly-only tests run: echo RUSTFLAGS=${RUSTFLAGS}\ --cfg=thiserror_nightly_testing >> $GITHUB_ENV if: matrix.rust == 'nightly' - run: cargo test --workspace --exclude thiserror_no_std_test - run: cargo test --manifest-path tests/no-std/Cargo.toml if: matrix.rust != '1.70.0' - run: cargo test --no-default-features - uses: actions/upload-artifact@v4 if: matrix.rust == 'nightly' && always() with: name: Cargo.lock path: Cargo.lock continue-on-error: true msrv: name: Rust 1.61.0 needs: pre_ci if: needs.pre_ci.outputs.continue runs-on: ubuntu-latest timeout-minutes: 45 steps: - uses: actions/checkout@v4 - uses: dtolnay/rust-toolchain@1.61.0 with: components: rust-src - run: cargo check minimal: name: Minimal versions needs: pre_ci if: needs.pre_ci.outputs.continue runs-on: ubuntu-latest timeout-minutes: 45 steps: - uses: actions/checkout@v4 - uses: dtolnay/rust-toolchain@nightly - run: 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aware that the original Cargo.toml # will likely look very different (and much more reasonable). # See Cargo.toml.orig for the original contents. [package] edition = "2021" rust-version = "1.61" name = "thiserror" version = "2.0.11" authors = ["David Tolnay "] build = "build.rs" autolib = false autobins = false autoexamples = false autotests = false autobenches = false description = "derive(Error)" documentation = "https://docs.rs/thiserror" readme = "README.md" keywords = [ "error", "error-handling", "derive", ] categories = ["rust-patterns"] license = "MIT OR Apache-2.0" repository = "https://github.com/dtolnay/thiserror" [package.metadata.docs.rs] rustdoc-args = ["--generate-link-to-definition"] targets = ["x86_64-unknown-linux-gnu"] [features] default = ["std"] std = [] [lib] name = "thiserror" path = "src/lib.rs" [[test]] name = "compiletest" path = "tests/compiletest.rs" [[test]] name = "test_backtrace" path = "tests/test_backtrace.rs" [[test]] name = "test_display" path = "tests/test_display.rs" [[test]] name = "test_error" path = "tests/test_error.rs" [[test]] name = "test_expr" path = "tests/test_expr.rs" [[test]] name = "test_from" path = "tests/test_from.rs" [[test]] name = "test_generics" path = "tests/test_generics.rs" [[test]] name = "test_lints" path = "tests/test_lints.rs" [[test]] name = "test_option" path = "tests/test_option.rs" [[test]] name = "test_path" path = "tests/test_path.rs" [[test]] name = "test_source" path = "tests/test_source.rs" [[test]] name = "test_transparent" path = "tests/test_transparent.rs" [dependencies.thiserror-impl] version = "=2.0.11" [dev-dependencies.anyhow] version = "1.0.73" [dev-dependencies.ref-cast] version = "1.0.18" [dev-dependencies.rustversion] version = "1.0.13" [dev-dependencies.trybuild] version = "1.0.81" features = ["diff"] thiserror-2.0.11/Cargo.toml.orig000064400000000000000000000022201046102023000146110ustar 00000000000000[package] name = "thiserror" version = "2.0.11" authors = ["David Tolnay "] categories = ["rust-patterns"] description = "derive(Error)" documentation = "https://docs.rs/thiserror" edition = "2021" keywords = ["error", "error-handling", "derive"] license = "MIT OR Apache-2.0" repository = "https://github.com/dtolnay/thiserror" rust-version = "1.61" [features] default = ["std"] # Std feature enables support for formatting std::path::{Path, PathBuf} # conveniently in an error message. # # #[derive(Error, Debug)] # #[error("failed to create configuration file {path}")] # pub struct MyError { # pub path: PathBuf, # pub source: std::io::Error, # } # # Without std, this would need to be written #[error("... {}", path.display())]. std = [] [dependencies] thiserror-impl = { version = "=2.0.11", path = "impl" } [dev-dependencies] anyhow = "1.0.73" ref-cast = "1.0.18" rustversion = "1.0.13" trybuild = { version = "1.0.81", features = ["diff"] } [workspace] members = ["impl", "tests/no-std"] [package.metadata.docs.rs] targets = ["x86_64-unknown-linux-gnu"] rustdoc-args = ["--generate-link-to-definition"] thiserror-2.0.11/LICENSE-APACHE000064400000000000000000000227731046102023000136650ustar 00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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END OF TERMS AND CONDITIONS thiserror-2.0.11/LICENSE-MIT000064400000000000000000000017771046102023000133760ustar 00000000000000Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. thiserror-2.0.11/README.md000064400000000000000000000165221046102023000132130ustar 00000000000000derive(Error) ============= [github](https://github.com/dtolnay/thiserror) [crates.io](https://crates.io/crates/thiserror) [docs.rs](https://docs.rs/thiserror) [build status](https://github.com/dtolnay/thiserror/actions?query=branch%3Amaster) This library provides a convenient derive macro for the standard library's [`std::error::Error`] trait. [`std::error::Error`]: https://doc.rust-lang.org/std/error/trait.Error.html ```toml [dependencies] thiserror = "2" ``` *Compiler support: requires rustc 1.61+*
## Example ```rust use thiserror::Error; #[derive(Error, Debug)] pub enum DataStoreError { #[error("data store disconnected")] Disconnect(#[from] io::Error), #[error("the data for key `{0}` is not available")] Redaction(String), #[error("invalid header (expected {expected:?}, found {found:?})")] InvalidHeader { expected: String, found: String, }, #[error("unknown data store error")] Unknown, } ```
## Details - Thiserror deliberately does not appear in your public API. You get the same thing as if you had written an implementation of `std::error::Error` by hand, and switching from handwritten impls to thiserror or vice versa is not a breaking change. - Errors may be enums, structs with named fields, tuple structs, or unit structs. - A `Display` impl is generated for your error if you provide `#[error("...")]` messages on the struct or each variant of your enum, as shown above in the example. The messages support a shorthand for interpolating fields from the error. - `#[error("{var}")]` ⟶ `write!("{}", self.var)` - `#[error("{0}")]` ⟶ `write!("{}", self.0)` - `#[error("{var:?}")]` ⟶ `write!("{:?}", self.var)` - `#[error("{0:?}")]` ⟶ `write!("{:?}", self.0)` These shorthands can be used together with any additional format args, which may be arbitrary expressions. For example: ```rust #[derive(Error, Debug)] pub enum Error { #[error("invalid rdo_lookahead_frames {0} (expected < {max})", max = i32::MAX)] InvalidLookahead(u32), } ``` If one of the additional expression arguments needs to refer to a field of the struct or enum, then refer to named fields as `.var` and tuple fields as `.0`. ```rust #[derive(Error, Debug)] pub enum Error { #[error("first letter must be lowercase but was {:?}", first_char(.0))] WrongCase(String), #[error("invalid index {idx}, expected at least {} and at most {}", .limits.lo, .limits.hi)] OutOfBounds { idx: usize, limits: Limits }, } ``` - A `From` impl is generated for each variant that contains a `#[from]` attribute. The variant using `#[from]` must not contain any other fields beyond the source error (and possibly a backtrace — see below). Usually `#[from]` fields are unnamed, but `#[from]` is allowed on a named field too. ```rust #[derive(Error, Debug)] pub enum MyError { Io(#[from] io::Error), Glob(#[from] globset::Error), } ``` - The Error trait's `source()` method is implemented to return whichever field has a `#[source]` attribute or is named `source`, if any. This is for identifying the underlying lower level error that caused your error. The `#[from]` attribute always implies that the same field is `#[source]`, so you don't ever need to specify both attributes. Any error type that implements `std::error::Error` or dereferences to `dyn std::error::Error` will work as a source. ```rust #[derive(Error, Debug)] pub struct MyError { msg: String, #[source] // optional if field name is `source` source: anyhow::Error, } ``` - The Error trait's `provide()` method is implemented to provide whichever field has a type named `Backtrace`, if any, as a `std::backtrace::Backtrace`. Using `Backtrace` in errors requires a nightly compiler with Rust version 1.73 or newer. ```rust use std::backtrace::Backtrace; #[derive(Error, Debug)] pub struct MyError { msg: String, backtrace: Backtrace, // automatically detected } ``` - If a field is both a source (named `source`, or has `#[source]` or `#[from]` attribute) *and* is marked `#[backtrace]`, then the Error trait's `provide()` method is forwarded to the source's `provide` so that both layers of the error share the same backtrace. The `#[backtrace]` attribute requires a nightly compiler with Rust version 1.73 or newer. ```rust #[derive(Error, Debug)] pub enum MyError { Io { #[backtrace] source: io::Error, }, } ``` - For variants that use `#[from]` and also contain a `Backtrace` field, a backtrace is captured from within the `From` impl. ```rust #[derive(Error, Debug)] pub enum MyError { Io { #[from] source: io::Error, backtrace: Backtrace, }, } ``` - Errors may use `error(transparent)` to forward the source and Display methods straight through to an underlying error without adding an additional message. This would be appropriate for enums that need an "anything else" variant. ```rust #[derive(Error, Debug)] pub enum MyError { ... #[error(transparent)] Other(#[from] anyhow::Error), // source and Display delegate to anyhow::Error } ``` Another use case is hiding implementation details of an error representation behind an opaque error type, so that the representation is able to evolve without breaking the crate's public API. ```rust // PublicError is public, but opaque and easy to keep compatible. #[derive(Error, Debug)] #[error(transparent)] pub struct PublicError(#[from] ErrorRepr); impl PublicError { // Accessors for anything we do want to expose publicly. } // Private and free to change across minor version of the crate. #[derive(Error, Debug)] enum ErrorRepr { ... } ``` - See also the [`anyhow`] library for a convenient single error type to use in application code. [`anyhow`]: https://github.com/dtolnay/anyhow
## Comparison to anyhow Use thiserror if you care about designing your own dedicated error type(s) so that the caller receives exactly the information that you choose in the event of failure. This most often applies to library-like code. Use [Anyhow] if you don't care what error type your functions return, you just want it to be easy. This is common in application-like code. [Anyhow]: https://github.com/dtolnay/anyhow
#### License Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions. thiserror-2.0.11/build/probe.rs000064400000000000000000000015141046102023000145030ustar 00000000000000// This code exercises the surface area that we expect of the Error generic // member access API. If the current toolchain is able to compile it, then // thiserror is able to provide backtrace support. #![no_std] #![feature(error_generic_member_access)] use core::error::{Error, Request}; use core::fmt::{self, Debug, Display}; struct MyError(Thing); struct Thing; impl Debug for MyError { fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result { unimplemented!() } } impl Display for MyError { fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result { unimplemented!() } } impl Error for MyError { fn provide<'a>(&'a self, request: &mut Request<'a>) { request.provide_ref(&self.0); } } // Include in sccache cache key. const _: Option<&str> = option_env!("RUSTC_BOOTSTRAP"); thiserror-2.0.11/build.rs000064400000000000000000000137531046102023000134040ustar 00000000000000use std::env; use std::ffi::OsString; use std::fs; use std::io::ErrorKind; use std::iter; use std::path::Path; use std::process::{self, Command, Stdio}; use std::str; fn main() { println!("cargo:rerun-if-changed=build/probe.rs"); println!("cargo:rustc-check-cfg=cfg(error_generic_member_access)"); println!("cargo:rustc-check-cfg=cfg(thiserror_nightly_testing)"); println!("cargo:rustc-check-cfg=cfg(thiserror_no_backtrace_type)"); let error_generic_member_access; let consider_rustc_bootstrap; if compile_probe(false) { // This is a nightly or dev compiler, so it supports unstable features // regardless of RUSTC_BOOTSTRAP. No need to rerun build script if // RUSTC_BOOTSTRAP is changed. error_generic_member_access = true; consider_rustc_bootstrap = false; } else if let Some(rustc_bootstrap) = env::var_os("RUSTC_BOOTSTRAP") { if compile_probe(true) { // This is a stable or beta compiler for which the user has set // RUSTC_BOOTSTRAP to turn on unstable features. Rerun build script // if they change it. error_generic_member_access = true; consider_rustc_bootstrap = true; } else if rustc_bootstrap == "1" { // This compiler does not support the generic member access API in // the form that thiserror expects. No need to pay attention to // RUSTC_BOOTSTRAP. error_generic_member_access = false; consider_rustc_bootstrap = false; } else { // This is a stable or beta compiler for which RUSTC_BOOTSTRAP is // set to restrict the use of unstable features by this crate. error_generic_member_access = false; consider_rustc_bootstrap = true; } } else { // Without RUSTC_BOOTSTRAP, this compiler does not support the generic // member access API in the form that thiserror expects, but try again // if the user turns on unstable features. error_generic_member_access = false; consider_rustc_bootstrap = true; } if error_generic_member_access { println!("cargo:rustc-cfg=error_generic_member_access"); } if consider_rustc_bootstrap { println!("cargo:rerun-if-env-changed=RUSTC_BOOTSTRAP"); } // core::error::Error stabilized in Rust 1.81 // https://blog.rust-lang.org/2024/09/05/Rust-1.81.0.html#coreerrorerror let rustc = rustc_minor_version(); if cfg!(not(feature = "std")) && rustc.map_or(false, |rustc| rustc < 81) { println!("cargo:rustc-cfg=feature=\"std\""); } let rustc = match rustc { Some(rustc) => rustc, None => return, }; // std::backtrace::Backtrace stabilized in Rust 1.65 // https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html#stabilized-apis if rustc < 65 { println!("cargo:rustc-cfg=thiserror_no_backtrace_type"); } } fn compile_probe(rustc_bootstrap: bool) -> bool { if env::var_os("RUSTC_STAGE").is_some() { // We are running inside rustc bootstrap. This is a highly non-standard // environment with issues such as: // // https://github.com/rust-lang/cargo/issues/11138 // https://github.com/rust-lang/rust/issues/114839 // // Let's just not use nightly features here. return false; } let rustc = cargo_env_var("RUSTC"); let out_dir = cargo_env_var("OUT_DIR"); let out_subdir = Path::new(&out_dir).join("probe"); let probefile = Path::new("build").join("probe.rs"); if let Err(err) = fs::create_dir(&out_subdir) { if err.kind() != ErrorKind::AlreadyExists { eprintln!("Failed to create {}: {}", out_subdir.display(), err); process::exit(1); } } let rustc_wrapper = env::var_os("RUSTC_WRAPPER").filter(|wrapper| !wrapper.is_empty()); let rustc_workspace_wrapper = env::var_os("RUSTC_WORKSPACE_WRAPPER").filter(|wrapper| !wrapper.is_empty()); let mut rustc = rustc_wrapper .into_iter() .chain(rustc_workspace_wrapper) .chain(iter::once(rustc)); let mut cmd = Command::new(rustc.next().unwrap()); cmd.args(rustc); if !rustc_bootstrap { cmd.env_remove("RUSTC_BOOTSTRAP"); } cmd.stderr(Stdio::null()) .arg("--edition=2018") .arg("--crate-name=thiserror") .arg("--crate-type=lib") .arg("--cap-lints=allow") .arg("--emit=dep-info,metadata") .arg("--out-dir") .arg(&out_subdir) .arg(probefile); if let Some(target) = env::var_os("TARGET") { cmd.arg("--target").arg(target); } // If Cargo wants to set RUSTFLAGS, use that. if let Ok(rustflags) = env::var("CARGO_ENCODED_RUSTFLAGS") { if !rustflags.is_empty() { for arg in rustflags.split('\x1f') { cmd.arg(arg); } } } let success = match cmd.status() { Ok(status) => status.success(), Err(_) => false, }; // Clean up to avoid leaving nondeterministic absolute paths in the dep-info // file in OUT_DIR, which causes nonreproducible builds in build systems // that treat the entire OUT_DIR as an artifact. if let Err(err) = fs::remove_dir_all(&out_subdir) { if err.kind() != ErrorKind::NotFound { eprintln!("Failed to clean up {}: {}", out_subdir.display(), err); process::exit(1); } } success } fn rustc_minor_version() -> Option { let rustc = cargo_env_var("RUSTC"); let output = Command::new(rustc).arg("--version").output().ok()?; let version = str::from_utf8(&output.stdout).ok()?; let mut pieces = version.split('.'); if pieces.next() != Some("rustc 1") { return None; } pieces.next()?.parse().ok() } fn cargo_env_var(key: &str) -> OsString { env::var_os(key).unwrap_or_else(|| { eprintln!("Environment variable ${key} is not set during execution of build script"); process::exit(1); }) } thiserror-2.0.11/rust-toolchain.toml000064400000000000000000000000461046102023000155760ustar 00000000000000[toolchain] components = ["rust-src"] thiserror-2.0.11/src/aserror.rs000064400000000000000000000021471046102023000145440ustar 00000000000000use core::error::Error; use core::panic::UnwindSafe; #[doc(hidden)] pub trait AsDynError<'a>: Sealed { fn as_dyn_error(&self) -> &(dyn Error + 'a); } impl<'a, T: Error + 'a> AsDynError<'a> for T { #[inline] fn as_dyn_error(&self) -> &(dyn Error + 'a) { self } } impl<'a> AsDynError<'a> for dyn Error + 'a { #[inline] fn as_dyn_error(&self) -> &(dyn Error + 'a) { self } } impl<'a> AsDynError<'a> for dyn Error + Send + 'a { #[inline] fn as_dyn_error(&self) -> &(dyn Error + 'a) { self } } impl<'a> AsDynError<'a> for dyn Error + Send + Sync + 'a { #[inline] fn as_dyn_error(&self) -> &(dyn Error + 'a) { self } } impl<'a> AsDynError<'a> for dyn Error + Send + Sync + UnwindSafe + 'a { #[inline] fn as_dyn_error(&self) -> &(dyn Error + 'a) { self } } #[doc(hidden)] pub trait Sealed {} impl Sealed for T {} impl<'a> Sealed for dyn Error + 'a {} impl<'a> Sealed for dyn Error + Send + 'a {} impl<'a> Sealed for dyn Error + Send + Sync + 'a {} impl<'a> Sealed for dyn Error + Send + Sync + UnwindSafe + 'a {} thiserror-2.0.11/src/display.rs000064400000000000000000000035351046102023000145360ustar 00000000000000use core::fmt::Display; #[cfg(feature = "std")] use std::path::{self, Path, PathBuf}; #[doc(hidden)] pub trait AsDisplay<'a>: Sealed { // TODO: convert to generic associated type. // https://github.com/dtolnay/thiserror/pull/253 type Target: Display; fn as_display(&'a self) -> Self::Target; } impl<'a, T> AsDisplay<'a> for &T where T: Display + ?Sized + 'a, { type Target = &'a T; fn as_display(&'a self) -> Self::Target { *self } } #[cfg(feature = "std")] impl<'a> AsDisplay<'a> for Path { type Target = path::Display<'a>; #[inline] fn as_display(&'a self) -> Self::Target { self.display() } } #[cfg(feature = "std")] impl<'a> AsDisplay<'a> for PathBuf { type Target = path::Display<'a>; #[inline] fn as_display(&'a self) -> Self::Target { self.display() } } #[doc(hidden)] pub trait Sealed {} impl Sealed for &T {} #[cfg(feature = "std")] impl Sealed for Path {} #[cfg(feature = "std")] impl Sealed for PathBuf {} // Add a synthetic second impl of AsDisplay to prevent the "single applicable // impl" rule from making too weird inference decision based on the single impl // for &T, which could lead to code that compiles with thiserror's std feature // off but breaks under feature unification when std is turned on by an // unrelated crate. #[cfg(not(feature = "std"))] mod placeholder { use super::{AsDisplay, Sealed}; use core::fmt::{self, Display}; pub struct Placeholder; impl<'a> AsDisplay<'a> for Placeholder { type Target = Self; #[inline] fn as_display(&'a self) -> Self::Target { Placeholder } } impl Display for Placeholder { fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result { unreachable!() } } impl Sealed for Placeholder {} } thiserror-2.0.11/src/lib.rs000064400000000000000000000223711046102023000136360ustar 00000000000000//! [![github]](https://github.com/dtolnay/thiserror) [![crates-io]](https://crates.io/crates/thiserror) [![docs-rs]](https://docs.rs/thiserror) //! //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust //! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs //! //!
//! //! This library provides a convenient derive macro for the standard library's //! [`std::error::Error`] trait. //! //! [`std::error::Error`]: https://doc.rust-lang.org/std/error/trait.Error.html //! //!
//! //! # Example //! //! ```rust //! # use std::io; //! use thiserror::Error; //! //! #[derive(Error, Debug)] //! pub enum DataStoreError { //! #[error("data store disconnected")] //! Disconnect(#[from] io::Error), //! #[error("the data for key `{0}` is not available")] //! Redaction(String), //! #[error("invalid header (expected {expected:?}, found {found:?})")] //! InvalidHeader { //! expected: String, //! found: String, //! }, //! #[error("unknown data store error")] //! Unknown, //! } //! ``` //! //!
//! //! # Details //! //! - Thiserror deliberately does not appear in your public API. You get the //! same thing as if you had written an implementation of `std::error::Error` //! by hand, and switching from handwritten impls to thiserror or vice versa //! is not a breaking change. //! //! - Errors may be enums, structs with named fields, tuple structs, or unit //! structs. //! //! - A `Display` impl is generated for your error if you provide //! `#[error("...")]` messages on the struct or each variant of your enum, as //! shown above in the example. //! //! The messages support a shorthand for interpolating fields from the error. //! //! - `#[error("{var}")]` ⟶ `write!("{}", self.var)` //! - `#[error("{0}")]` ⟶ `write!("{}", self.0)` //! - `#[error("{var:?}")]` ⟶ `write!("{:?}", self.var)` //! - `#[error("{0:?}")]` ⟶ `write!("{:?}", self.0)` //! //! These shorthands can be used together with any additional format args, //! which may be arbitrary expressions. For example: //! //! ```rust //! # use core::i32; //! # use thiserror::Error; //! # //! #[derive(Error, Debug)] //! pub enum Error { //! #[error("invalid rdo_lookahead_frames {0} (expected < {max})", max = i32::MAX)] //! InvalidLookahead(u32), //! } //! ``` //! //! If one of the additional expression arguments needs to refer to a field of //! the struct or enum, then refer to named fields as `.var` and tuple fields //! as `.0`. //! //! ```rust //! # use thiserror::Error; //! # //! # fn first_char(s: &String) -> char { //! # s.chars().next().unwrap() //! # } //! # //! # #[derive(Debug)] //! # struct Limits { //! # lo: usize, //! # hi: usize, //! # } //! # //! #[derive(Error, Debug)] //! pub enum Error { //! #[error("first letter must be lowercase but was {:?}", first_char(.0))] //! WrongCase(String), //! #[error("invalid index {idx}, expected at least {} and at most {}", .limits.lo, .limits.hi)] //! OutOfBounds { idx: usize, limits: Limits }, //! } //! ``` //! //! - A `From` impl is generated for each variant that contains a `#[from]` //! attribute. //! //! The variant using `#[from]` must not contain any other fields beyond the //! source error (and possibly a backtrace — see below). Usually //! `#[from]` fields are unnamed, but `#[from]` is allowed on a named field //! too. //! //! ```rust //! # use core::fmt::{self, Display}; //! # use std::io; //! # use thiserror::Error; //! # //! # mod globset { //! # #[derive(thiserror::Error, Debug)] //! # #[error("...")] //! # pub struct Error; //! # } //! # //! #[derive(Error, Debug)] //! pub enum MyError { //! Io(#[from] io::Error), //! Glob(#[from] globset::Error), //! } //! # //! # impl Display for MyError { //! # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { //! # unimplemented!() //! # } //! # } //! ``` //! //! - The Error trait's `source()` method is implemented to return whichever //! field has a `#[source]` attribute or is named `source`, if any. This is //! for identifying the underlying lower level error that caused your error. //! //! The `#[from]` attribute always implies that the same field is `#[source]`, //! so you don't ever need to specify both attributes. //! //! Any error type that implements `std::error::Error` or dereferences to `dyn //! std::error::Error` will work as a source. //! //! ```rust //! # use core::fmt::{self, Display}; //! # use thiserror::Error; //! # //! #[derive(Error, Debug)] //! pub struct MyError { //! msg: String, //! #[source] // optional if field name is `source` //! source: anyhow::Error, //! } //! # //! # impl Display for MyError { //! # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { //! # unimplemented!() //! # } //! # } //! ``` //! //! - The Error trait's `provide()` method is implemented to provide whichever //! field has a type named `Backtrace`, if any, as a //! `std::backtrace::Backtrace`. Using `Backtrace` in errors requires a //! nightly compiler with Rust version 1.73 or newer. //! //! ```rust //! # const IGNORE: &str = stringify! { //! use std::backtrace::Backtrace; //! //! #[derive(Error, Debug)] //! pub struct MyError { //! msg: String, //! backtrace: Backtrace, // automatically detected //! } //! # }; //! ``` //! //! - If a field is both a source (named `source`, or has `#[source]` or //! `#[from]` attribute) *and* is marked `#[backtrace]`, then the Error //! trait's `provide()` method is forwarded to the source's `provide` so that //! both layers of the error share the same backtrace. The `#[backtrace]` //! attribute requires a nightly compiler with Rust version 1.73 or newer. //! //! ```rust //! # const IGNORE: &str = stringify! { //! #[derive(Error, Debug)] //! pub enum MyError { //! Io { //! #[backtrace] //! source: io::Error, //! }, //! } //! # }; //! ``` //! //! - For variants that use `#[from]` and also contain a `Backtrace` field, a //! backtrace is captured from within the `From` impl. //! //! ```rust //! # const IGNORE: &str = stringify! { //! #[derive(Error, Debug)] //! pub enum MyError { //! Io { //! #[from] //! source: io::Error, //! backtrace: Backtrace, //! }, //! } //! # }; //! ``` //! //! - Errors may use `error(transparent)` to forward the source and Display //! methods straight through to an underlying error without adding an //! additional message. This would be appropriate for enums that need an //! "anything else" variant. //! //! ``` //! # use thiserror::Error; //! # //! #[derive(Error, Debug)] //! pub enum MyError { //! # /* //! ... //! # */ //! //! #[error(transparent)] //! Other(#[from] anyhow::Error), // source and Display delegate to anyhow::Error //! } //! ``` //! //! Another use case is hiding implementation details of an error //! representation behind an opaque error type, so that the representation is //! able to evolve without breaking the crate's public API. //! //! ``` //! # use thiserror::Error; //! # //! // PublicError is public, but opaque and easy to keep compatible. //! #[derive(Error, Debug)] //! #[error(transparent)] //! pub struct PublicError(#[from] ErrorRepr); //! //! impl PublicError { //! // Accessors for anything we do want to expose publicly. //! } //! //! // Private and free to change across minor version of the crate. //! #[derive(Error, Debug)] //! enum ErrorRepr { //! # /* //! ... //! # */ //! } //! ``` //! //! - See also the [`anyhow`] library for a convenient single error type to use //! in application code. //! //! [`anyhow`]: https://github.com/dtolnay/anyhow #![no_std] #![doc(html_root_url = "https://docs.rs/thiserror/2.0.11")] #![allow( clippy::module_name_repetitions, clippy::needless_lifetimes, clippy::return_self_not_must_use, clippy::wildcard_imports )] #![cfg_attr(error_generic_member_access, feature(error_generic_member_access))] #[cfg(all(thiserror_nightly_testing, not(error_generic_member_access)))] compile_error!("Build script probe failed to compile."); #[cfg(feature = "std")] extern crate std; #[cfg(feature = "std")] extern crate std as core; mod aserror; mod display; #[cfg(error_generic_member_access)] mod provide; mod var; pub use thiserror_impl::*; // Not public API. #[doc(hidden)] pub mod __private { #[doc(hidden)] pub use crate::aserror::AsDynError; #[doc(hidden)] pub use crate::display::AsDisplay; #[cfg(error_generic_member_access)] #[doc(hidden)] pub use crate::provide::ThiserrorProvide; #[doc(hidden)] pub use crate::var::Var; #[doc(hidden)] pub use core::error::Error; #[cfg(all(feature = "std", not(thiserror_no_backtrace_type)))] #[doc(hidden)] pub use std::backtrace::Backtrace; } thiserror-2.0.11/src/provide.rs000064400000000000000000000006411046102023000145340ustar 00000000000000use core::error::{Error, Request}; #[doc(hidden)] pub trait ThiserrorProvide: Sealed { fn thiserror_provide<'a>(&'a self, request: &mut Request<'a>); } impl ThiserrorProvide for T where T: Error + ?Sized, { #[inline] fn thiserror_provide<'a>(&'a self, request: &mut Request<'a>) { self.provide(request); } } #[doc(hidden)] pub trait Sealed {} impl Sealed for T {} thiserror-2.0.11/src/var.rs000064400000000000000000000003661046102023000136600ustar 00000000000000use core::fmt::{self, Pointer}; pub struct Var<'a, T: ?Sized>(pub &'a T); impl<'a, T: Pointer + ?Sized> Pointer for Var<'a, T> { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { Pointer::fmt(self.0, formatter) } } thiserror-2.0.11/tests/compiletest.rs000064400000000000000000000003261046102023000157670ustar 00000000000000#[rustversion::attr(not(nightly), ignore = "requires nightly")] #[cfg_attr(miri, ignore = "incompatible with miri")] #[test] fn ui() { let t = trybuild::TestCases::new(); t.compile_fail("tests/ui/*.rs"); } thiserror-2.0.11/tests/test_backtrace.rs000064400000000000000000000157401046102023000164230ustar 00000000000000#![cfg(feature = "std")] #![cfg_attr(thiserror_nightly_testing, feature(error_generic_member_access))] use thiserror::Error; #[derive(Error, Debug)] #[error("...")] pub struct Inner; #[cfg(thiserror_nightly_testing)] #[derive(Error, Debug)] #[error("...")] pub struct InnerBacktrace { backtrace: std::backtrace::Backtrace, } #[cfg(thiserror_nightly_testing)] pub mod structs { use super::{Inner, InnerBacktrace}; use std::backtrace::Backtrace; use std::error::{self, Error}; use std::sync::Arc; use thiserror::Error; mod not_backtrace { #[derive(Debug)] pub struct Backtrace; } #[derive(Error, Debug)] #[error("...")] pub struct PlainBacktrace { backtrace: Backtrace, } #[derive(Error, Debug)] #[error("...")] pub struct ExplicitBacktrace { #[backtrace] backtrace: Backtrace, } #[derive(Error, Debug)] #[error("...")] pub struct NotBacktrace { backtrace: crate::structs::not_backtrace::r#Backtrace, } #[derive(Error, Debug)] #[error("...")] pub struct OptBacktrace { #[backtrace] backtrace: Option, } #[derive(Error, Debug)] #[error("...")] pub struct ArcBacktrace { #[backtrace] backtrace: Arc, } #[derive(Error, Debug)] #[error("...")] pub struct BacktraceFrom { #[from] source: Inner, #[backtrace] backtrace: Backtrace, } #[derive(Error, Debug)] #[error("...")] pub struct CombinedBacktraceFrom { #[from] #[backtrace] source: InnerBacktrace, } #[derive(Error, Debug)] #[error("...")] pub struct OptBacktraceFrom { #[from] source: Inner, #[backtrace] backtrace: Option, } #[derive(Error, Debug)] #[error("...")] pub struct ArcBacktraceFrom { #[from] source: Inner, #[backtrace] backtrace: Arc, } #[derive(Error, Debug)] #[error("...")] pub struct AnyhowBacktrace { #[backtrace] source: anyhow::Error, } #[derive(Error, Debug)] #[error("...")] pub struct BoxDynErrorBacktrace { #[backtrace] source: Box, } #[test] fn test_backtrace() { let error = PlainBacktrace { backtrace: Backtrace::capture(), }; assert!(error::request_ref::(&error).is_some()); let error = ExplicitBacktrace { backtrace: Backtrace::capture(), }; assert!(error::request_ref::(&error).is_some()); let error = OptBacktrace { backtrace: Some(Backtrace::capture()), }; assert!(error::request_ref::(&error).is_some()); let error = ArcBacktrace { backtrace: Arc::new(Backtrace::capture()), }; assert!(error::request_ref::(&error).is_some()); let error = BacktraceFrom::from(Inner); assert!(error::request_ref::(&error).is_some()); let error = CombinedBacktraceFrom::from(InnerBacktrace { backtrace: Backtrace::capture(), }); assert!(error::request_ref::(&error).is_some()); let error = OptBacktraceFrom::from(Inner); assert!(error::request_ref::(&error).is_some()); let error = ArcBacktraceFrom::from(Inner); assert!(error::request_ref::(&error).is_some()); let error = AnyhowBacktrace { source: anyhow::Error::msg("..."), }; assert!(error::request_ref::(&error).is_some()); let error = BoxDynErrorBacktrace { source: Box::new(PlainBacktrace { backtrace: Backtrace::capture(), }), }; assert!(error::request_ref::(&error).is_some()); } } #[cfg(thiserror_nightly_testing)] pub mod enums { use super::{Inner, InnerBacktrace}; use std::backtrace::Backtrace; use std::error; use std::sync::Arc; use thiserror::Error; #[derive(Error, Debug)] pub enum PlainBacktrace { #[error("...")] Test { backtrace: Backtrace }, } #[derive(Error, Debug)] pub enum ExplicitBacktrace { #[error("...")] Test { #[backtrace] backtrace: Backtrace, }, } #[derive(Error, Debug)] pub enum OptBacktrace { #[error("...")] Test { #[backtrace] backtrace: Option, }, } #[derive(Error, Debug)] pub enum ArcBacktrace { #[error("...")] Test { #[backtrace] backtrace: Arc, }, } #[derive(Error, Debug)] pub enum BacktraceFrom { #[error("...")] Test { #[from] source: Inner, #[backtrace] backtrace: Backtrace, }, } #[derive(Error, Debug)] pub enum CombinedBacktraceFrom { #[error("...")] Test { #[from] #[backtrace] source: InnerBacktrace, }, } #[derive(Error, Debug)] pub enum OptBacktraceFrom { #[error("...")] Test { #[from] source: Inner, #[backtrace] backtrace: Option, }, } #[derive(Error, Debug)] pub enum ArcBacktraceFrom { #[error("...")] Test { #[from] source: Inner, #[backtrace] backtrace: Arc, }, } #[test] fn test_backtrace() { let error = PlainBacktrace::Test { backtrace: Backtrace::capture(), }; assert!(error::request_ref::(&error).is_some()); let error = ExplicitBacktrace::Test { backtrace: Backtrace::capture(), }; assert!(error::request_ref::(&error).is_some()); let error = OptBacktrace::Test { backtrace: Some(Backtrace::capture()), }; assert!(error::request_ref::(&error).is_some()); let error = ArcBacktrace::Test { backtrace: Arc::new(Backtrace::capture()), }; assert!(error::request_ref::(&error).is_some()); let error = BacktraceFrom::from(Inner); assert!(error::request_ref::(&error).is_some()); let error = CombinedBacktraceFrom::from(InnerBacktrace { backtrace: Backtrace::capture(), }); assert!(error::request_ref::(&error).is_some()); let error = OptBacktraceFrom::from(Inner); assert!(error::request_ref::(&error).is_some()); let error = ArcBacktraceFrom::from(Inner); assert!(error::request_ref::(&error).is_some()); } } #[test] #[cfg_attr( not(thiserror_nightly_testing), ignore = "requires `--cfg=thiserror_nightly_testing`" )] fn test_backtrace() {} thiserror-2.0.11/tests/test_display.rs000064400000000000000000000244431046102023000161510ustar 00000000000000#![allow( clippy::needless_lifetimes, clippy::needless_raw_string_hashes, clippy::trivially_copy_pass_by_ref, clippy::uninlined_format_args )] use core::fmt::{self, Display}; use thiserror::Error; fn assert(expected: &str, value: T) { assert_eq!(expected, value.to_string()); } #[test] fn test_braced() { #[derive(Error, Debug)] #[error("braced error: {msg}")] struct Error { msg: String, } let msg = "T".to_owned(); assert("braced error: T", Error { msg }); } #[test] fn test_braced_unused() { #[derive(Error, Debug)] #[error("braced error")] struct Error { extra: usize, } assert("braced error", Error { extra: 0 }); } #[test] fn test_tuple() { #[derive(Error, Debug)] #[error("tuple error: {0}")] struct Error(usize); assert("tuple error: 0", Error(0)); } #[test] fn test_unit() { #[derive(Error, Debug)] #[error("unit error")] struct Error; assert("unit error", Error); } #[test] fn test_enum() { #[derive(Error, Debug)] enum Error { #[error("braced error: {id}")] Braced { id: usize }, #[error("tuple error: {0}")] Tuple(usize), #[error("unit error")] Unit, } assert("braced error: 0", Error::Braced { id: 0 }); assert("tuple error: 0", Error::Tuple(0)); assert("unit error", Error::Unit); } #[test] fn test_constants() { #[derive(Error, Debug)] #[error("{MSG}: {id:?} (code {CODE:?})")] struct Error { id: &'static str, } const MSG: &str = "failed to do"; const CODE: usize = 9; assert("failed to do: \"\" (code 9)", Error { id: "" }); } #[test] fn test_inherit() { #[derive(Error, Debug)] #[error("{0}")] enum Error { Some(&'static str), #[error("other error")] Other(&'static str), } assert("some error", Error::Some("some error")); assert("other error", Error::Other("...")); } #[test] fn test_brace_escape() { #[derive(Error, Debug)] #[error("fn main() {{}}")] struct Error; assert("fn main() {}", Error); } #[test] fn test_expr() { #[derive(Error, Debug)] #[error("1 + 1 = {}", 1 + 1)] struct Error; assert("1 + 1 = 2", Error); } #[test] fn test_nested() { #[derive(Error, Debug)] #[error("!bool = {}", not(.0))] struct Error(bool); #[allow(clippy::trivially_copy_pass_by_ref)] fn not(bool: &bool) -> bool { !*bool } assert("!bool = false", Error(true)); } #[test] fn test_match() { #[derive(Error, Debug)] #[error("{intro}: {0}", intro = match .1 { Some(n) => format!("error occurred with {}", n), None => "there was an empty error".to_owned(), })] struct Error(String, Option); assert( "error occurred with 1: ...", Error("...".to_owned(), Some(1)), ); assert( "there was an empty error: ...", Error("...".to_owned(), None), ); } #[test] fn test_nested_display() { // Same behavior as the one in `test_match`, but without String allocations. #[derive(Error, Debug)] #[error("{}", { struct Msg<'a>(&'a String, &'a Option); impl<'a> Display for Msg<'a> { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { match self.1 { Some(n) => write!(formatter, "error occurred with {}", n), None => write!(formatter, "there was an empty error"), }?; write!(formatter, ": {}", self.0) } } Msg(.0, .1) })] struct Error(String, Option); assert( "error occurred with 1: ...", Error("...".to_owned(), Some(1)), ); assert( "there was an empty error: ...", Error("...".to_owned(), None), ); } #[test] fn test_void() { #[allow(clippy::empty_enum)] #[derive(Error, Debug)] #[error("...")] pub enum Error {} let _: Error; } #[test] fn test_mixed() { #[derive(Error, Debug)] #[error("a={a} :: b={} :: c={c} :: d={d}", 1, c = 2, d = 3)] struct Error { a: usize, d: usize, } assert("a=0 :: b=1 :: c=2 :: d=3", Error { a: 0, d: 0 }); } #[test] fn test_ints() { #[derive(Error, Debug)] enum Error { #[error("error {0}")] Tuple(usize, usize), #[error("error {0}", '?')] Struct { v: usize }, } assert("error 9", Error::Tuple(9, 0)); assert("error ?", Error::Struct { v: 0 }); } #[test] fn test_trailing_comma() { #[derive(Error, Debug)] #[error( "error {0}", )] #[rustfmt::skip] struct Error(char); assert("error ?", Error('?')); } #[test] fn test_field() { #[derive(Debug)] struct Inner { data: usize, } #[derive(Error, Debug)] #[error("{}", .0.data)] struct Error(Inner); assert("0", Error(Inner { data: 0 })); } #[test] fn test_nested_tuple_field() { #[derive(Debug)] struct Inner(usize); #[derive(Error, Debug)] #[error("{}", .0.0)] struct Error(Inner); assert("0", Error(Inner(0))); } #[test] fn test_pointer() { #[derive(Error, Debug)] #[error("{field:p}")] pub struct Struct { field: Box, } let s = Struct { field: Box::new(-1), }; assert_eq!(s.to_string(), format!("{:p}", s.field)); } #[test] fn test_macro_rules_variant_from_call_site() { // Regression test for https://github.com/dtolnay/thiserror/issues/86 macro_rules! decl_error { ($variant:ident($value:ident)) => { #[derive(Error, Debug)] pub enum Error0 { #[error("{0:?}")] $variant($value), } #[derive(Error, Debug)] #[error("{0:?}")] pub enum Error1 { $variant($value), } }; } decl_error!(Repro(u8)); assert("0", Error0::Repro(0)); assert("0", Error1::Repro(0)); } #[test] fn test_macro_rules_message_from_call_site() { // Regression test for https://github.com/dtolnay/thiserror/issues/398 macro_rules! decl_error { ($($errors:tt)*) => { #[derive(Error, Debug)] pub enum Error { $($errors)* } }; } decl_error! { #[error("{0}")] Unnamed(u8), #[error("{x}")] Named { x: u8 }, } assert("0", Error::Unnamed(0)); assert("0", Error::Named { x: 0 }); } #[test] fn test_raw() { #[derive(Error, Debug)] #[error("braced raw error: {fn}")] struct Error { r#fn: &'static str, } assert("braced raw error: T", Error { r#fn: "T" }); } #[test] fn test_raw_enum() { #[derive(Error, Debug)] enum Error { #[error("braced raw error: {fn}")] Braced { r#fn: &'static str }, } assert("braced raw error: T", Error::Braced { r#fn: "T" }); } #[test] fn test_keyword() { #[derive(Error, Debug)] #[error("error: {type}", type = 1)] struct Error; assert("error: 1", Error); } #[test] fn test_self() { #[derive(Error, Debug)] #[error("error: {self:?}")] struct Error; assert("error: Error", Error); } #[test] fn test_str_special_chars() { #[derive(Error, Debug)] pub enum Error { #[error("brace left {{")] BraceLeft, #[error("brace left 2 \x7B\x7B")] BraceLeft2, #[error("brace left 3 \u{7B}\u{7B}")] BraceLeft3, #[error("brace right }}")] BraceRight, #[error("brace right 2 \x7D\x7D")] BraceRight2, #[error("brace right 3 \u{7D}\u{7D}")] BraceRight3, #[error( "new_\ line" )] NewLine, #[error("escape24 \u{78}")] Escape24, } assert("brace left {", Error::BraceLeft); assert("brace left 2 {", Error::BraceLeft2); assert("brace left 3 {", Error::BraceLeft3); assert("brace right }", Error::BraceRight); assert("brace right 2 }", Error::BraceRight2); assert("brace right 3 }", Error::BraceRight3); assert("new_line", Error::NewLine); assert("escape24 x", Error::Escape24); } #[test] fn test_raw_str() { #[derive(Error, Debug)] pub enum Error { #[error(r#"raw brace left {{"#)] BraceLeft, #[error(r#"raw brace left 2 \x7B"#)] BraceLeft2, #[error(r#"raw brace right }}"#)] BraceRight, #[error(r#"raw brace right 2 \x7D"#)] BraceRight2, } assert(r#"raw brace left {"#, Error::BraceLeft); assert(r#"raw brace left 2 \x7B"#, Error::BraceLeft2); assert(r#"raw brace right }"#, Error::BraceRight); assert(r#"raw brace right 2 \x7D"#, Error::BraceRight2); } mod util { use core::fmt::{self, Octal}; pub fn octal(value: &T, formatter: &mut fmt::Formatter) -> fmt::Result { write!(formatter, "0o{:o}", value) } } #[test] fn test_fmt_path() { fn unit(formatter: &mut fmt::Formatter) -> fmt::Result { formatter.write_str("unit=") } fn pair(k: &i32, v: &i32, formatter: &mut fmt::Formatter) -> fmt::Result { write!(formatter, "pair={k}:{v}") } #[derive(Error, Debug)] pub enum Error { #[error(fmt = unit)] Unit, #[error(fmt = pair)] Tuple(i32, i32), #[error(fmt = pair)] Entry { k: i32, v: i32 }, #[error(fmt = crate::util::octal)] I16(i16), #[error(fmt = crate::util::octal::)] I32 { n: i32 }, #[error(fmt = core::fmt::Octal::fmt)] I64(i64), #[error("...{0}")] Other(bool), } assert("unit=", Error::Unit); assert("pair=10:0", Error::Tuple(10, 0)); assert("pair=10:0", Error::Entry { k: 10, v: 0 }); assert("0o777", Error::I16(0o777)); assert("0o777", Error::I32 { n: 0o777 }); assert("777", Error::I64(0o777)); assert("...false", Error::Other(false)); } #[test] fn test_fmt_path_inherited() { #[derive(Error, Debug)] #[error(fmt = crate::util::octal)] pub enum Error { I16(i16), I32 { n: i32, }, #[error(fmt = core::fmt::Octal::fmt)] I64(i64), #[error("...{0}")] Other(bool), } assert("0o777", Error::I16(0o777)); assert("0o777", Error::I32 { n: 0o777 }); assert("777", Error::I64(0o777)); assert("...false", Error::Other(false)); } thiserror-2.0.11/tests/test_error.rs000064400000000000000000000020151046102023000156240ustar 00000000000000#![allow(dead_code)] use core::fmt::{self, Display}; use std::io; use thiserror::Error; macro_rules! unimplemented_display { ($ty:ty) => { impl Display for $ty { fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result { unimplemented!() } } }; } #[derive(Error, Debug)] struct BracedError { msg: String, pos: usize, } #[derive(Error, Debug)] struct TupleError(String, usize); #[derive(Error, Debug)] struct UnitError; #[derive(Error, Debug)] struct WithSource { #[source] cause: io::Error, } #[derive(Error, Debug)] struct WithAnyhow { #[source] cause: anyhow::Error, } #[derive(Error, Debug)] enum EnumError { Braced { #[source] cause: io::Error, }, Tuple(#[source] io::Error), Unit, } unimplemented_display!(BracedError); unimplemented_display!(TupleError); unimplemented_display!(UnitError); unimplemented_display!(WithSource); unimplemented_display!(WithAnyhow); unimplemented_display!(EnumError); thiserror-2.0.11/tests/test_expr.rs000064400000000000000000000056771046102023000154720ustar 00000000000000#![allow(clippy::iter_cloned_collect, clippy::uninlined_format_args)] use core::fmt::Display; #[cfg(feature = "std")] use std::path::PathBuf; use thiserror::Error; // Some of the elaborate cases from the rcc codebase, which is a C compiler in // Rust. https://github.com/jyn514/rcc/blob/0.8.0/src/data/error.rs #[derive(Error, Debug)] pub enum CompilerError { #[error("cannot shift {} by {maximum} or more bits (got {current})", if *.is_left { "left" } else { "right" })] TooManyShiftBits { is_left: bool, maximum: u64, current: u64, }, #[error("#error {}", (.0).iter().copied().collect::>().join(" "))] User(Vec<&'static str>), #[error("overflow while parsing {}integer literal", if let Some(signed) = .is_signed { if *signed { "signed "} else { "unsigned "} } else { "" } )] IntegerOverflow { is_signed: Option }, #[error("overflow while parsing {}integer literal", match .is_signed { Some(true) => "signed ", Some(false) => "unsigned ", None => "", })] IntegerOverflow2 { is_signed: Option }, } // Examples drawn from Rustup. #[derive(Error, Debug)] pub enum RustupError { #[error( "toolchain '{name}' does not contain component {component}{}", .suggestion .as_ref() .map_or_else(String::new, |s| format!("; did you mean '{}'?", s)), )] UnknownComponent { name: String, component: String, suggestion: Option, }, } #[track_caller] fn assert(expected: &str, value: T) { assert_eq!(expected, value.to_string()); } #[test] fn test_rcc() { assert( "cannot shift left by 32 or more bits (got 50)", CompilerError::TooManyShiftBits { is_left: true, maximum: 32, current: 50, }, ); assert("#error A B C", CompilerError::User(vec!["A", "B", "C"])); assert( "overflow while parsing signed integer literal", CompilerError::IntegerOverflow { is_signed: Some(true), }, ); } #[test] fn test_rustup() { assert( "toolchain 'nightly' does not contain component clipy; did you mean 'clippy'?", RustupError::UnknownComponent { name: "nightly".to_owned(), component: "clipy".to_owned(), suggestion: Some("clippy".to_owned()), }, ); } // Regression test for https://github.com/dtolnay/thiserror/issues/335 #[cfg(feature = "std")] #[test] #[allow(non_snake_case)] fn test_assoc_type_equality_constraint() { pub trait Trait: Display { type A; } impl Trait for i32 { type A = i32; } #[derive(Error, Debug)] #[error("{A} {b}", b = &0 as &dyn Trait)] pub struct Error { pub A: PathBuf, } assert( "... 0", Error { A: PathBuf::from("..."), }, ); } thiserror-2.0.11/tests/test_from.rs000064400000000000000000000022461046102023000154440ustar 00000000000000#![allow(clippy::extra_unused_type_parameters)] use std::io; use thiserror::Error; #[derive(Error, Debug)] #[error("...")] pub struct ErrorStruct { #[from] source: io::Error, } #[derive(Error, Debug)] #[error("...")] pub struct ErrorStructOptional { #[from] source: Option, } #[derive(Error, Debug)] #[error("...")] pub struct ErrorTuple(#[from] io::Error); #[derive(Error, Debug)] #[error("...")] pub struct ErrorTupleOptional(#[from] Option); #[derive(Error, Debug)] #[error("...")] pub enum ErrorEnum { Test { #[from] source: io::Error, }, } #[derive(Error, Debug)] #[error("...")] pub enum ErrorEnumOptional { Test { #[from] source: Option, }, } #[derive(Error, Debug)] #[error("...")] pub enum Many { Any(#[from] anyhow::Error), Io(#[from] io::Error), } fn assert_impl>() {} #[test] fn test_from() { assert_impl::(); assert_impl::(); assert_impl::(); assert_impl::(); assert_impl::(); assert_impl::(); assert_impl::(); } thiserror-2.0.11/tests/test_generics.rs000064400000000000000000000113001046102023000162670ustar 00000000000000#![allow(clippy::needless_late_init, clippy::uninlined_format_args)] use core::fmt::{self, Debug, Display}; use core::str::FromStr; use thiserror::Error; pub struct NoFormat; #[derive(Debug)] pub struct DebugOnly; pub struct DisplayOnly; impl Display for DisplayOnly { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { f.write_str("display only") } } #[derive(Debug)] pub struct DebugAndDisplay; impl Display for DebugAndDisplay { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { f.write_str("debug and display") } } // Should expand to: // // impl Display for EnumDebugField // where // E: Debug; // // impl Error for EnumDebugField // where // Self: Debug + Display; // #[derive(Error, Debug)] pub enum EnumDebugGeneric { #[error("{0:?}")] FatalError(E), } // Should expand to: // // impl Display for EnumFromGeneric; // // impl Error for EnumFromGeneric // where // EnumDebugGeneric: Error + 'static, // Self: Debug + Display; // #[derive(Error, Debug)] pub enum EnumFromGeneric { #[error("enum from generic")] Source(#[from] EnumDebugGeneric), } // Should expand to: // // impl Display // for EnumCompound // where // HasDisplay: Display, // HasDebug: Debug; // // impl Error // for EnumCompound // where // Self: Debug + Display; // #[derive(Error)] pub enum EnumCompound { #[error("{0} {1:?}")] DisplayDebug(HasDisplay, HasDebug), #[error("{0}")] Display(HasDisplay, HasNeither), #[error("{1:?}")] Debug(HasNeither, HasDebug), } impl Debug for EnumCompound { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { f.write_str("EnumCompound") } } #[test] fn test_display_enum_compound() { let mut instance: EnumCompound; instance = EnumCompound::DisplayDebug(DisplayOnly, DebugOnly); assert_eq!(format!("{}", instance), "display only DebugOnly"); instance = EnumCompound::Display(DisplayOnly, NoFormat); assert_eq!(format!("{}", instance), "display only"); instance = EnumCompound::Debug(NoFormat, DebugOnly); assert_eq!(format!("{}", instance), "DebugOnly"); } // Should expand to: // // impl Display for EnumTransparentGeneric // where // E: Display; // // impl Error for EnumTransparentGeneric // where // E: Error, // Self: Debug + Display; // #[derive(Error, Debug)] pub enum EnumTransparentGeneric { #[error(transparent)] Other(E), } // Should expand to: // // impl Display for StructDebugGeneric // where // E: Debug; // // impl Error for StructDebugGeneric // where // Self: Debug + Display; // #[derive(Error, Debug)] #[error("{underlying:?}")] pub struct StructDebugGeneric { pub underlying: E, } // Should expand to: // // impl Error for StructFromGeneric // where // StructDebugGeneric: Error + 'static, // Self: Debug + Display; // #[derive(Error, Debug)] pub struct StructFromGeneric { #[from] pub source: StructDebugGeneric, } // Should expand to: // // impl Display for StructTransparentGeneric // where // E: Display; // // impl Error for StructTransparentGeneric // where // E: Error, // Self: Debug + Display; // #[derive(Error, Debug)] #[error(transparent)] pub struct StructTransparentGeneric(pub E); // Should expand to: // // impl Display for AssociatedTypeError // where // T::Err: Display; // // impl Error for AssociatedTypeError // where // Self: Debug + Display; // #[derive(Error, Debug)] pub enum AssociatedTypeError { #[error("couldn't parse matrix")] Other, #[error("couldn't parse entry: {0}")] EntryParseError(T::Err), } // Regression test for https://github.com/dtolnay/thiserror/issues/345 #[test] fn test_no_bound_on_named_fmt() { #[derive(Error, Debug)] #[error("{thing}", thing = "...")] struct Error { thing: T, } let error = Error { thing: DebugOnly }; assert_eq!(error.to_string(), "..."); } #[test] fn test_multiple_bound() { #[derive(Error, Debug)] #[error("0x{thing:x} 0x{thing:X}")] pub struct Error { thing: T, } let error = Error { thing: 0xFFi32 }; assert_eq!(error.to_string(), "0xff 0xFF"); } thiserror-2.0.11/tests/test_lints.rs000064400000000000000000000036261046102023000156350ustar 00000000000000#![allow(clippy::mixed_attributes_style)] use thiserror::Error; pub use std::error::Error; #[test] fn test_allow_attributes() { #![deny(clippy::allow_attributes)] #[derive(Error, Debug)] #[error("...")] pub struct MyError(#[from] anyhow::Error); let _: MyError; } #[test] fn test_unused_qualifications() { #![deny(unused_qualifications)] // Expansion of derive(Error) macro can't know whether something like // std::error::Error is already imported in the caller's scope so it must // suppress unused_qualifications. #[derive(Error, Debug)] #[error("...")] pub struct MyError; let _: MyError; } #[test] fn test_needless_lifetimes() { #![allow(dead_code)] #![deny(clippy::needless_lifetimes)] #[derive(Error, Debug)] #[error("...")] pub enum MyError<'a> { A(#[from] std::io::Error), B(&'a ()), } let _: MyError; } #[test] fn test_deprecated() { #![deny(deprecated)] #[derive(Error, Debug)] #[deprecated] #[error("...")] pub struct DeprecatedStruct; #[derive(Error, Debug)] #[error("{message} {}", .message)] pub struct DeprecatedStructField { #[deprecated] message: String, } #[derive(Error, Debug)] #[deprecated] pub enum DeprecatedEnum { #[error("...")] Variant, } #[derive(Error, Debug)] pub enum DeprecatedVariant { #[deprecated] #[error("...")] Variant, } #[derive(Error, Debug)] pub enum DeprecatedFrom { #[error(transparent)] Variant( #[from] #[allow(deprecated)] DeprecatedStruct, ), } #[allow(deprecated)] let _: DeprecatedStruct; #[allow(deprecated)] let _: DeprecatedStructField; #[allow(deprecated)] let _ = DeprecatedEnum::Variant; #[allow(deprecated)] let _ = DeprecatedVariant::Variant; } thiserror-2.0.11/tests/test_option.rs000064400000000000000000000046411046102023000160120ustar 00000000000000#![cfg(feature = "std")] #![cfg_attr(thiserror_nightly_testing, feature(error_generic_member_access))] #[cfg(thiserror_nightly_testing)] pub mod structs { use std::backtrace::Backtrace; use thiserror::Error; #[derive(Error, Debug)] #[error("...")] pub struct OptSourceNoBacktrace { #[source] pub source: Option, } #[derive(Error, Debug)] #[error("...")] pub struct OptSourceAlwaysBacktrace { #[source] pub source: Option, pub backtrace: Backtrace, } #[derive(Error, Debug)] #[error("...")] pub struct NoSourceOptBacktrace { #[backtrace] pub backtrace: Option, } #[derive(Error, Debug)] #[error("...")] pub struct AlwaysSourceOptBacktrace { pub source: anyhow::Error, #[backtrace] pub backtrace: Option, } #[derive(Error, Debug)] #[error("...")] pub struct OptSourceOptBacktrace { #[source] pub source: Option, #[backtrace] pub backtrace: Option, } } #[cfg(thiserror_nightly_testing)] pub mod enums { use std::backtrace::Backtrace; use thiserror::Error; #[derive(Error, Debug)] pub enum OptSourceNoBacktrace { #[error("...")] Test { #[source] source: Option, }, } #[derive(Error, Debug)] pub enum OptSourceAlwaysBacktrace { #[error("...")] Test { #[source] source: Option, backtrace: Backtrace, }, } #[derive(Error, Debug)] pub enum NoSourceOptBacktrace { #[error("...")] Test { #[backtrace] backtrace: Option, }, } #[derive(Error, Debug)] pub enum AlwaysSourceOptBacktrace { #[error("...")] Test { source: anyhow::Error, #[backtrace] backtrace: Option, }, } #[derive(Error, Debug)] pub enum OptSourceOptBacktrace { #[error("...")] Test { #[source] source: Option, #[backtrace] backtrace: Option, }, } } #[test] #[cfg_attr( not(thiserror_nightly_testing), ignore = "requires `--cfg=thiserror_nightly_testing`" )] fn test_option() {} thiserror-2.0.11/tests/test_path.rs000064400000000000000000000022401046102023000154270ustar 00000000000000#![cfg(feature = "std")] use core::fmt::Display; use ref_cast::RefCast; use std::path::{Path, PathBuf}; use thiserror::Error; #[derive(Error, Debug)] #[error("failed to read '{file}'")] struct StructPathBuf { file: PathBuf, } #[derive(Error, Debug, RefCast)] #[repr(C)] #[error("failed to read '{file}'")] struct StructPath { file: Path, } #[derive(Error, Debug)] enum EnumPathBuf { #[error("failed to read '{0}'")] Read(PathBuf), } #[derive(Error, Debug)] #[error("{tail}")] pub struct UnsizedError { pub head: i32, pub tail: str, } #[derive(Error, Debug)] pub enum BothError { #[error("display:{0} debug:{0:?}")] DisplayDebug(PathBuf), #[error("debug:{0:?} display:{0}")] DebugDisplay(PathBuf), } fn assert(expected: &str, value: T) { assert_eq!(expected, value.to_string()); } #[test] fn test_display() { let path = Path::new("/thiserror"); let file = path.to_owned(); assert("failed to read '/thiserror'", StructPathBuf { file }); let file = path.to_owned(); assert("failed to read '/thiserror'", EnumPathBuf::Read(file)); assert("failed to read '/thiserror'", StructPath::ref_cast(path)); } thiserror-2.0.11/tests/test_source.rs000064400000000000000000000034411046102023000157770ustar 00000000000000use std::error::Error as StdError; use std::io; use thiserror::Error; #[derive(Error, Debug)] #[error("implicit source")] pub struct ImplicitSource { source: io::Error, } #[derive(Error, Debug)] #[error("explicit source")] pub struct ExplicitSource { source: String, #[source] io: io::Error, } #[derive(Error, Debug)] #[error("boxed source")] pub struct BoxedSource { #[source] source: Box, } #[test] fn test_implicit_source() { let io = io::Error::new(io::ErrorKind::Other, "oh no!"); let error = ImplicitSource { source: io }; error.source().unwrap().downcast_ref::().unwrap(); } #[test] fn test_explicit_source() { let io = io::Error::new(io::ErrorKind::Other, "oh no!"); let error = ExplicitSource { source: String::new(), io, }; error.source().unwrap().downcast_ref::().unwrap(); } #[test] fn test_boxed_source() { let source = Box::new(io::Error::new(io::ErrorKind::Other, "oh no!")); let error = BoxedSource { source }; error.source().unwrap().downcast_ref::().unwrap(); } macro_rules! error_from_macro { ($($variants:tt)*) => { #[derive(Error)] #[derive(Debug)] pub enum MacroSource { $($variants)* } } } // Test that we generate impls with the proper hygiene #[rustfmt::skip] error_from_macro! { #[error("Something")] Variant(#[from] io::Error) } #[test] fn test_not_source() { #[derive(Error, Debug)] #[error("{source} ==> {destination}")] pub struct NotSource { r#source: char, destination: char, } let error = NotSource { source: 'S', destination: 'D', }; assert_eq!(error.to_string(), "S ==> D"); assert!(error.source().is_none()); } thiserror-2.0.11/tests/test_transparent.rs000064400000000000000000000045601046102023000170430ustar 00000000000000use anyhow::anyhow; use std::error::Error as _; use std::io; use thiserror::Error; #[test] fn test_transparent_struct() { #[derive(Error, Debug)] #[error(transparent)] struct Error(ErrorKind); #[derive(Error, Debug)] enum ErrorKind { #[error("E0")] E0, #[error("E1")] E1(#[from] io::Error), } let error = Error(ErrorKind::E0); assert_eq!("E0", error.to_string()); assert!(error.source().is_none()); let io = io::Error::new(io::ErrorKind::Other, "oh no!"); let error = Error(ErrorKind::from(io)); assert_eq!("E1", error.to_string()); error.source().unwrap().downcast_ref::().unwrap(); } #[test] fn test_transparent_enum() { #[derive(Error, Debug)] enum Error { #[error("this failed")] This, #[error(transparent)] Other(anyhow::Error), } let error = Error::This; assert_eq!("this failed", error.to_string()); let error = Error::Other(anyhow!("inner").context("outer")); assert_eq!("outer", error.to_string()); assert_eq!("inner", error.source().unwrap().to_string()); } #[test] fn test_transparent_enum_with_default_message() { #[derive(Error, Debug)] #[error("this failed: {0}_{1}")] enum Error { This(i32, i32), #[error(transparent)] Other(anyhow::Error), } let error = Error::This(-1, -1); assert_eq!("this failed: -1_-1", error.to_string()); let error = Error::Other(anyhow!("inner").context("outer")); assert_eq!("outer", error.to_string()); assert_eq!("inner", error.source().unwrap().to_string()); } #[test] fn test_anyhow() { #[derive(Error, Debug)] #[error(transparent)] struct Any(#[from] anyhow::Error); let error = Any::from(anyhow!("inner").context("outer")); assert_eq!("outer", error.to_string()); assert_eq!("inner", error.source().unwrap().to_string()); } #[test] fn test_non_static() { #[derive(Error, Debug)] #[error(transparent)] struct Error<'a> { inner: ErrorKind<'a>, } #[derive(Error, Debug)] enum ErrorKind<'a> { #[error("unexpected token: {:?}", token)] Unexpected { token: &'a str }, } let error = Error { inner: ErrorKind::Unexpected { token: "error" }, }; assert_eq!("unexpected token: \"error\"", error.to_string()); assert!(error.source().is_none()); } thiserror-2.0.11/tests/ui/bad-field-attr.rs000064400000000000000000000002131046102023000166260ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error(transparent)] pub struct Error(#[error(transparent)] std::io::Error); fn main() {} thiserror-2.0.11/tests/ui/bad-field-attr.stderr000064400000000000000000000003601046102023000175100ustar 00000000000000error: #[error(transparent)] needs to go outside the enum or struct, not on an individual field --> tests/ui/bad-field-attr.rs:5:18 | 5 | pub struct Error(#[error(transparent)] std::io::Error); | ^^^^^^^^^^^^^^^^^^^^^ thiserror-2.0.11/tests/ui/concat-display.rs000064400000000000000000000004451046102023000167700ustar 00000000000000use thiserror::Error; macro_rules! error_type { ($name:ident, $what:expr) => { // Use #[error("invalid {}", $what)] instead. #[derive(Error, Debug)] #[error(concat!("invalid ", $what))] pub struct $name; }; } error_type!(Error, "foo"); fn main() {} thiserror-2.0.11/tests/ui/concat-display.stderr000064400000000000000000000006211046102023000176430ustar 00000000000000error: expected one of: string literal, `transparent`, `fmt` --> tests/ui/concat-display.rs:8:17 | 8 | #[error(concat!("invalid ", $what))] | ^^^^^^ ... 13 | error_type!(Error, "foo"); | ------------------------- in this macro invocation | = note: this error originates in the macro `error_type` (in Nightly builds, run with -Z macro-backtrace for more info) thiserror-2.0.11/tests/ui/display-underscore.rs000064400000000000000000000001371046102023000176700ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error("{_}")] pub struct Error; fn main() {} thiserror-2.0.11/tests/ui/display-underscore.stderr000064400000000000000000000003521046102023000205460ustar 00000000000000error: invalid format string: invalid argument name `_` --> tests/ui/display-underscore.rs:4:11 | 4 | #[error("{_}")] | ^ invalid argument name in format string | = note: argument name cannot be a single underscore thiserror-2.0.11/tests/ui/duplicate-enum-source.rs000064400000000000000000000003041046102023000202620ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum ErrorEnum { Confusing { #[source] a: std::io::Error, #[source] b: anyhow::Error, }, } fn main() {} thiserror-2.0.11/tests/ui/duplicate-enum-source.stderr000064400000000000000000000002001046102023000211340ustar 00000000000000error: duplicate #[source] attribute --> tests/ui/duplicate-enum-source.rs:8:9 | 8 | #[source] | ^^^^^^^^^ thiserror-2.0.11/tests/ui/duplicate-fmt.rs000064400000000000000000000007001046102023000166060ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error("...")] #[error("...")] pub struct Error; #[derive(Error, Debug)] #[error(fmt = core::fmt::Octal::fmt)] #[error(fmt = core::fmt::LowerHex::fmt)] pub enum FmtFmt {} #[derive(Error, Debug)] #[error(fmt = core::fmt::Octal::fmt)] #[error(transparent)] pub enum FmtTransparent {} #[derive(Error, Debug)] #[error(fmt = core::fmt::Octal::fmt)] #[error("...")] pub enum FmtDisplay {} fn main() {} thiserror-2.0.11/tests/ui/duplicate-fmt.stderr000064400000000000000000000012411046102023000174660ustar 00000000000000error: only one #[error(...)] attribute is allowed --> tests/ui/duplicate-fmt.rs:5:1 | 5 | #[error("...")] | ^^^^^^^^^^^^^^^ error: duplicate #[error(fmt = ...)] attribute --> tests/ui/duplicate-fmt.rs:10:1 | 10 | #[error(fmt = core::fmt::LowerHex::fmt)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: cannot have both #[error(transparent)] and #[error(fmt = ...)] --> tests/ui/duplicate-fmt.rs:14:1 | 14 | #[error(fmt = core::fmt::Octal::fmt)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: cannot have both #[error(fmt = ...)] and a format arguments attribute --> tests/ui/duplicate-fmt.rs:20:1 | 20 | #[error("...")] | ^^^^^^^^^^^^^^^ thiserror-2.0.11/tests/ui/duplicate-struct-source.rs000064400000000000000000000002411046102023000206420ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub struct ErrorStruct { #[source] a: std::io::Error, #[source] b: anyhow::Error, } fn main() {} thiserror-2.0.11/tests/ui/duplicate-struct-source.stderr000064400000000000000000000001721046102023000215240ustar 00000000000000error: duplicate #[source] attribute --> tests/ui/duplicate-struct-source.rs:7:5 | 7 | #[source] | ^^^^^^^^^ thiserror-2.0.11/tests/ui/duplicate-transparent.rs000064400000000000000000000002121046102023000203570ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error(transparent)] #[error(transparent)] pub struct Error(anyhow::Error); fn main() {} thiserror-2.0.11/tests/ui/duplicate-transparent.stderr000064400000000000000000000002241046102023000212410ustar 00000000000000error: duplicate #[error(transparent)] attribute --> tests/ui/duplicate-transparent.rs:5:1 | 5 | #[error(transparent)] | ^^^^^^^^^^^^^^^^^^^^^ thiserror-2.0.11/tests/ui/expression-fallback.rs000064400000000000000000000001461046102023000200100ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error("".yellow)] pub struct ArgError; fn main() {} thiserror-2.0.11/tests/ui/expression-fallback.stderr000064400000000000000000000007611046102023000206720ustar 00000000000000error: expected `,`, found `.` --> tests/ui/expression-fallback.rs:4:11 | 4 | #[error("".yellow)] | ^ expected `,` error: argument never used --> tests/ui/expression-fallback.rs:4:12 | 4 | #[error("".yellow)] | -- ^^^^^^ argument never used | | | formatting specifier missing error[E0425]: cannot find value `yellow` in this scope --> tests/ui/expression-fallback.rs:4:12 | 4 | #[error("".yellow)] | ^^^^^^ not found in this scope thiserror-2.0.11/tests/ui/fallback-impl-with-display.rs000064400000000000000000000003731046102023000211700ustar 00000000000000use core::fmt::{self, Display}; use thiserror::Error; #[derive(Error, Debug)] #[error] pub struct MyError; impl Display for MyError { fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result { unimplemented!() } } fn main() {} thiserror-2.0.11/tests/ui/fallback-impl-with-display.stderr000064400000000000000000000011201046102023000220360ustar 00000000000000error: expected attribute arguments in parentheses: #[error(...)] --> tests/ui/fallback-impl-with-display.rs:5:3 | 5 | #[error] | ^^^^^ error[E0119]: conflicting implementations of trait `std::fmt::Display` for type `MyError` --> tests/ui/fallback-impl-with-display.rs:4:10 | 4 | #[derive(Error, Debug)] | ^^^^^ conflicting implementation for `MyError` ... 8 | impl Display for MyError { | ------------------------ first implementation here | = note: this error originates in the derive macro `Error` (in Nightly builds, run with -Z macro-backtrace for more info) thiserror-2.0.11/tests/ui/from-backtrace-backtrace.rs000064400000000000000000000003651046102023000206540ustar 00000000000000// https://github.com/dtolnay/thiserror/issues/163 use std::backtrace::Backtrace; use thiserror::Error; #[derive(Error, Debug)] #[error("...")] pub struct Error( #[from] #[backtrace] std::io::Error, Backtrace, ); fn main() {} thiserror-2.0.11/tests/ui/from-backtrace-backtrace.stderr000064400000000000000000000002321046102023000215240ustar 00000000000000error: deriving From requires no fields other than source and backtrace --> tests/ui/from-backtrace-backtrace.rs:9:5 | 9 | #[from] | ^^^^^^^ thiserror-2.0.11/tests/ui/from-not-source.rs000064400000000000000000000002421046102023000171100ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub struct Error { #[source] source: std::io::Error, #[from] other: anyhow::Error, } fn main() {} thiserror-2.0.11/tests/ui/from-not-source.stderr000064400000000000000000000002231046102023000177660ustar 00000000000000error: #[from] is only supported on the source field, not any other field --> tests/ui/from-not-source.rs:7:5 | 7 | #[from] | ^^^^^^^ thiserror-2.0.11/tests/ui/invalid-input-impl-anyway.rs000064400000000000000000000003561046102023000211070ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error] pub struct MyError; fn main() { // No error on the following line. Thiserror emits an Error impl despite the // bad attribute. _ = &MyError as &dyn std::error::Error; } thiserror-2.0.11/tests/ui/invalid-input-impl-anyway.stderr000064400000000000000000000002161046102023000217610ustar 00000000000000error: expected attribute arguments in parentheses: #[error(...)] --> tests/ui/invalid-input-impl-anyway.rs:4:3 | 4 | #[error] | ^^^^^ thiserror-2.0.11/tests/ui/lifetime.rs000064400000000000000000000006741046102023000156600ustar 00000000000000use core::fmt::Debug; use thiserror::Error; #[derive(Error, Debug)] #[error("error")] struct Error<'a>(#[from] Inner<'a>); #[derive(Error, Debug)] #[error("{0}")] struct Inner<'a>(&'a str); #[derive(Error, Debug)] enum Enum<'a> { #[error("error")] Foo(#[from] Generic<&'a str>), } #[derive(Error, Debug)] #[error("{0:?}")] struct Generic(T); fn main() -> Result<(), Error<'static>> { Err(Error(Inner("some text"))) } thiserror-2.0.11/tests/ui/lifetime.stderr000064400000000000000000000010001046102023000165170ustar 00000000000000error: non-static lifetimes are not allowed in the source of an error, because std::error::Error requires the source is dyn Error + 'static --> tests/ui/lifetime.rs:6:26 | 6 | struct Error<'a>(#[from] Inner<'a>); | ^^^^^^^^^ error: non-static lifetimes are not allowed in the source of an error, because std::error::Error requires the source is dyn Error + 'static --> tests/ui/lifetime.rs:15:17 | 15 | Foo(#[from] Generic<&'a str>), | ^^^^^^^^^^^^^^^^ thiserror-2.0.11/tests/ui/missing-display.rs000064400000000000000000000001511046102023000171640ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum MyError { First, Second, } fn main() {} thiserror-2.0.11/tests/ui/missing-display.stderr000064400000000000000000000014011046102023000200420ustar 00000000000000error[E0277]: `MyError` doesn't implement `std::fmt::Display` --> tests/ui/missing-display.rs:4:10 | 3 | #[derive(Error, Debug)] | ----- in this derive macro expansion 4 | pub enum MyError { | ^^^^^^^ `MyError` cannot be formatted with the default formatter | = help: the trait `std::fmt::Display` is not implemented for `MyError` = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead note: required by a bound in `std::error::Error` --> $RUST/core/src/error.rs | | pub trait Error: Debug + Display { | ^^^^^^^ required by this bound in `Error` = note: this error originates in the derive macro `Error` (in Nightly builds, run with -Z macro-backtrace for more info) thiserror-2.0.11/tests/ui/missing-fmt.rs000064400000000000000000000002001046102023000163000ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum Error { #[error("...")] A(usize), B(usize), } fn main() {} thiserror-2.0.11/tests/ui/missing-fmt.stderr000064400000000000000000000001711046102023000171660ustar 00000000000000error: missing #[error("...")] display attribute --> tests/ui/missing-fmt.rs:7:5 | 7 | B(usize), | ^^^^^^^^ thiserror-2.0.11/tests/ui/no-display.rs000064400000000000000000000004231046102023000161310ustar 00000000000000use thiserror::Error; #[derive(Debug)] struct NoDisplay; #[derive(Error, Debug)] #[error("thread: {thread}")] pub struct Error { thread: NoDisplay, } #[derive(Error, Debug)] #[error("thread: {thread:o}")] pub struct ErrorOctal { thread: NoDisplay, } fn main() {} thiserror-2.0.11/tests/ui/no-display.stderr000064400000000000000000000036541046102023000170210ustar 00000000000000error[E0599]: the method `as_display` exists for reference `&NoDisplay`, but its trait bounds were not satisfied --> tests/ui/no-display.rs:7:9 | 4 | struct NoDisplay; | ---------------- doesn't satisfy `NoDisplay: std::fmt::Display` ... 7 | #[error("thread: {thread}")] | ^^^^^^^^^^^^^^^^^^ method cannot be called on `&NoDisplay` due to unsatisfied trait bounds | = note: the following trait bounds were not satisfied: `NoDisplay: std::fmt::Display` which is required by `&NoDisplay: AsDisplay<'_>` note: the trait `std::fmt::Display` must be implemented --> $RUST/core/src/fmt/mod.rs | | pub trait Display { | ^^^^^^^^^^^^^^^^^ = help: items from traits can only be used if the trait is implemented and in scope = note: the following trait defines an item `as_display`, perhaps you need to implement it: candidate #1: `AsDisplay` error[E0277]: the trait bound `NoDisplay: Octal` is not satisfied --> tests/ui/no-display.rs:13:9 | 12 | #[derive(Error, Debug)] | ----- in this derive macro expansion 13 | #[error("thread: {thread:o}")] | ^^^^^^^^^^^^^^^^^^^^ the trait `Octal` is not implemented for `NoDisplay` | = help: the following other types implement trait `Octal`: &T &mut T NonZero Saturating Wrapping i128 i16 i32 and $N others = note: required for `&NoDisplay` to implement `Octal` note: required by a bound in `core::fmt::rt::Argument::<'_>::new_octal` --> $RUST/core/src/fmt/rt.rs | | pub fn new_octal(x: &T) -> Argument<'_> { | ^^^^^ required by this bound in `Argument::<'_>::new_octal` = note: this error originates in the macro `$crate::format_args` which comes from the expansion of the derive macro `Error` (in Nightly builds, run with -Z macro-backtrace for more info) thiserror-2.0.11/tests/ui/numbered-positional-tuple.rs000064400000000000000000000002331046102023000211600ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error("invalid rdo_lookahead_frames {0} (expected < {})", i32::MAX)] pub struct Error(u32); fn main() {} thiserror-2.0.11/tests/ui/numbered-positional-tuple.stderr000064400000000000000000000004701046102023000220420ustar 00000000000000error: ambiguous reference to positional arguments by number in a tuple struct; change this to a named argument --> tests/ui/numbered-positional-tuple.rs:4:61 | 4 | #[error("invalid rdo_lookahead_frames {0} (expected < {})", i32::MAX)] | ^^^^^^^^ thiserror-2.0.11/tests/ui/raw-identifier.rs000064400000000000000000000003011046102023000167560ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error("error: {r#fn}")] pub struct Error { r#fn: &'static str, } fn main() { let r#fn = "..."; let _ = format!("error: {r#fn}"); } thiserror-2.0.11/tests/ui/raw-identifier.stderr000064400000000000000000000015231046102023000176440ustar 00000000000000error: invalid format string: raw identifiers are not supported --> tests/ui/raw-identifier.rs:4:18 | 4 | #[error("error: {r#fn}")] | --^^ | | | raw identifier used here in format string | help: remove the `r#` | = note: identifiers in format strings can be keywords and don't need to be prefixed with `r#` error: invalid format string: raw identifiers are not supported --> tests/ui/raw-identifier.rs:11:30 | 11 | let _ = format!("error: {r#fn}"); | --^^ | | | raw identifier used here in format string | help: remove the `r#` | = note: identifiers in format strings can be keywords and don't need to be prefixed with `r#` thiserror-2.0.11/tests/ui/same-from-type.rs000064400000000000000000000003341046102023000167200ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum Error { #[error("failed to open")] OpenFile(#[from] std::io::Error), #[error("failed to close")] CloseFile(#[from] std::io::Error), } fn main() {} thiserror-2.0.11/tests/ui/same-from-type.stderr000064400000000000000000000005611046102023000176010ustar 00000000000000error[E0119]: conflicting implementations of trait `From` for type `Error` --> tests/ui/same-from-type.rs:8:15 | 6 | OpenFile(#[from] std::io::Error), | ------- first implementation here 7 | #[error("failed to close")] 8 | CloseFile(#[from] std::io::Error), | ^^^^^^^ conflicting implementation for `Error` thiserror-2.0.11/tests/ui/source-enum-not-error.rs000064400000000000000000000002541046102023000202430ustar 00000000000000use thiserror::Error; #[derive(Debug)] pub struct NotError; #[derive(Error, Debug)] #[error("...")] pub enum ErrorEnum { Broken { source: NotError }, } fn main() {} thiserror-2.0.11/tests/ui/source-enum-not-error.stderr000064400000000000000000000020521046102023000211200ustar 00000000000000error[E0599]: the method `as_dyn_error` exists for reference `&NotError`, but its trait bounds were not satisfied --> tests/ui/source-enum-not-error.rs:9:14 | 4 | pub struct NotError; | ------------------- doesn't satisfy `NotError: AsDynError<'_>` or `NotError: std::error::Error` ... 9 | Broken { source: NotError }, | ^^^^^^ method cannot be called on `&NotError` due to unsatisfied trait bounds | = note: the following trait bounds were not satisfied: `NotError: std::error::Error` which is required by `NotError: AsDynError<'_>` `&NotError: std::error::Error` which is required by `&NotError: AsDynError<'_>` note: the trait `std::error::Error` must be implemented --> $RUST/core/src/error.rs | | pub trait Error: Debug + Display { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = help: items from traits can only be used if the trait is implemented and in scope = note: the following trait defines an item `as_dyn_error`, perhaps you need to implement it: candidate #1: `AsDynError` thiserror-2.0.11/tests/ui/source-enum-unnamed-field-not-error.rs000064400000000000000000000002531046102023000227500ustar 00000000000000use thiserror::Error; #[derive(Debug)] pub struct NotError; #[derive(Error, Debug)] #[error("...")] pub enum ErrorEnum { Broken(#[source] NotError), } fn main() {} thiserror-2.0.11/tests/ui/source-enum-unnamed-field-not-error.stderr000064400000000000000000000020701046102023000236260ustar 00000000000000error[E0599]: the method `as_dyn_error` exists for reference `&NotError`, but its trait bounds were not satisfied --> tests/ui/source-enum-unnamed-field-not-error.rs:9:12 | 4 | pub struct NotError; | ------------------- doesn't satisfy `NotError: AsDynError<'_>` or `NotError: std::error::Error` ... 9 | Broken(#[source] NotError), | ^^^^^^^^^ method cannot be called on `&NotError` due to unsatisfied trait bounds | = note: the following trait bounds were not satisfied: `NotError: std::error::Error` which is required by `NotError: AsDynError<'_>` `&NotError: std::error::Error` which is required by `&NotError: AsDynError<'_>` note: the trait `std::error::Error` must be implemented --> $RUST/core/src/error.rs | | pub trait Error: Debug + Display { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = help: items from traits can only be used if the trait is implemented and in scope = note: the following trait defines an item `as_dyn_error`, perhaps you need to implement it: candidate #1: `AsDynError` thiserror-2.0.11/tests/ui/source-struct-not-error.rs000064400000000000000000000002411046102023000206170ustar 00000000000000use thiserror::Error; #[derive(Debug)] struct NotError; #[derive(Error, Debug)] #[error("...")] pub struct ErrorStruct { source: NotError, } fn main() {} thiserror-2.0.11/tests/ui/source-struct-not-error.stderr000064400000000000000000000017411046102023000215040ustar 00000000000000error[E0599]: the method `as_dyn_error` exists for struct `NotError`, but its trait bounds were not satisfied --> tests/ui/source-struct-not-error.rs:9:5 | 4 | struct NotError; | --------------- method `as_dyn_error` not found for this struct because it doesn't satisfy `NotError: AsDynError<'_>` or `NotError: std::error::Error` ... 9 | source: NotError, | ^^^^^^ method cannot be called on `NotError` due to unsatisfied trait bounds | = note: the following trait bounds were not satisfied: `NotError: std::error::Error` which is required by `NotError: AsDynError<'_>` note: the trait `std::error::Error` must be implemented --> $RUST/core/src/error.rs | | pub trait Error: Debug + Display { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = help: items from traits can only be used if the trait is implemented and in scope = note: the following trait defines an item `as_dyn_error`, perhaps you need to implement it: candidate #1: `AsDynError` thiserror-2.0.11/tests/ui/source-struct-unnamed-field-not-error.rs000064400000000000000000000002341046102023000233270ustar 00000000000000use thiserror::Error; #[derive(Debug)] struct NotError; #[derive(Error, Debug)] #[error("...")] pub struct ErrorStruct(#[source] NotError); fn main() {} thiserror-2.0.11/tests/ui/source-struct-unnamed-field-not-error.stderr000064400000000000000000000020341046102023000242060ustar 00000000000000error[E0599]: the method `as_dyn_error` exists for struct `NotError`, but its trait bounds were not satisfied --> tests/ui/source-struct-unnamed-field-not-error.rs:8:24 | 4 | struct NotError; | --------------- method `as_dyn_error` not found for this struct because it doesn't satisfy `NotError: AsDynError<'_>` or `NotError: std::error::Error` ... 8 | pub struct ErrorStruct(#[source] NotError); | ^^^^^^^^^ method cannot be called on `NotError` due to unsatisfied trait bounds | = note: the following trait bounds were not satisfied: `NotError: std::error::Error` which is required by `NotError: AsDynError<'_>` note: the trait `std::error::Error` must be implemented --> $RUST/core/src/error.rs | | pub trait Error: Debug + Display { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = help: items from traits can only be used if the trait is implemented and in scope = note: the following trait defines an item `as_dyn_error`, perhaps you need to implement it: candidate #1: `AsDynError` thiserror-2.0.11/tests/ui/struct-with-fmt.rs000064400000000000000000000001721046102023000171340ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error(fmt = core::fmt::Octal::fmt)] pub struct Error(i32); fn main() {} thiserror-2.0.11/tests/ui/struct-with-fmt.stderr000064400000000000000000000003421046102023000200120ustar 00000000000000error: #[error(fmt = ...)] is only supported in enums; for a struct, handwrite your own Display impl --> tests/ui/struct-with-fmt.rs:4:1 | 4 | #[error(fmt = core::fmt::Octal::fmt)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ thiserror-2.0.11/tests/ui/transparent-display.rs000064400000000000000000000002041046102023000200530ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error(transparent)] #[error("...")] pub struct Error(anyhow::Error); fn main() {} thiserror-2.0.11/tests/ui/transparent-display.stderr000064400000000000000000000002331046102023000207340ustar 00000000000000error: cannot have both #[error(transparent)] and a display attribute --> tests/ui/transparent-display.rs:5:1 | 5 | #[error("...")] | ^^^^^^^^^^^^^^^ thiserror-2.0.11/tests/ui/transparent-enum-many.rs000064400000000000000000000002141046102023000203150ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum Error { #[error(transparent)] Other(anyhow::Error, String), } fn main() {} thiserror-2.0.11/tests/ui/transparent-enum-many.stderr000064400000000000000000000003261046102023000212000ustar 00000000000000error: #[error(transparent)] requires exactly one field --> tests/ui/transparent-enum-many.rs:5:5 | 5 | / #[error(transparent)] 6 | | Other(anyhow::Error, String), | |________________________________^ thiserror-2.0.11/tests/ui/transparent-enum-not-error.rs000064400000000000000000000002111046102023000212750ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum Error { #[error(transparent)] Other { message: String }, } fn main() {} thiserror-2.0.11/tests/ui/transparent-enum-not-error.stderr000064400000000000000000000015401046102023000221620ustar 00000000000000error[E0599]: the method `as_dyn_error` exists for reference `&String`, but its trait bounds were not satisfied --> tests/ui/transparent-enum-not-error.rs:5:13 | 5 | #[error(transparent)] | ^^^^^^^^^^^ method cannot be called on `&String` due to unsatisfied trait bounds | ::: $RUST/alloc/src/string.rs | | pub struct String { | ----------------- doesn't satisfy `String: AsDynError<'_>` or `String: std::error::Error` | = note: the following trait bounds were not satisfied: `String: std::error::Error` which is required by `String: AsDynError<'_>` `&String: std::error::Error` which is required by `&String: AsDynError<'_>` `str: Sized` which is required by `str: AsDynError<'_>` `str: std::error::Error` which is required by `str: AsDynError<'_>` thiserror-2.0.11/tests/ui/transparent-enum-source.rs000064400000000000000000000002161046102023000206530ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum Error { #[error(transparent)] Other(#[source] anyhow::Error), } fn main() {} thiserror-2.0.11/tests/ui/transparent-enum-source.stderr000064400000000000000000000002451046102023000215340ustar 00000000000000error: transparent variant can't contain #[source] --> tests/ui/transparent-enum-source.rs:6:11 | 6 | Other(#[source] anyhow::Error), | ^^^^^^^^^ thiserror-2.0.11/tests/ui/transparent-enum-unnamed-field-not-error.rs000064400000000000000000000001751046102023000240140ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum Error { #[error(transparent)] Other(String), } fn main() {} thiserror-2.0.11/tests/ui/transparent-enum-unnamed-field-not-error.stderr000064400000000000000000000015561046102023000246770ustar 00000000000000error[E0599]: the method `as_dyn_error` exists for reference `&String`, but its trait bounds were not satisfied --> tests/ui/transparent-enum-unnamed-field-not-error.rs:5:13 | 5 | #[error(transparent)] | ^^^^^^^^^^^ method cannot be called on `&String` due to unsatisfied trait bounds | ::: $RUST/alloc/src/string.rs | | pub struct String { | ----------------- doesn't satisfy `String: AsDynError<'_>` or `String: std::error::Error` | = note: the following trait bounds were not satisfied: `String: std::error::Error` which is required by `String: AsDynError<'_>` `&String: std::error::Error` which is required by `&String: AsDynError<'_>` `str: Sized` which is required by `str: AsDynError<'_>` `str: std::error::Error` which is required by `str: AsDynError<'_>` thiserror-2.0.11/tests/ui/transparent-struct-many.rs000064400000000000000000000002241046102023000206760ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error(transparent)] pub struct Error { inner: anyhow::Error, what: String, } fn main() {} thiserror-2.0.11/tests/ui/transparent-struct-many.stderr000064400000000000000000000002351046102023000215570ustar 00000000000000error: #[error(transparent)] requires exactly one field --> tests/ui/transparent-struct-many.rs:4:1 | 4 | #[error(transparent)] | ^^^^^^^^^^^^^^^^^^^^^ thiserror-2.0.11/tests/ui/transparent-struct-not-error.rs000064400000000000000000000001751046102023000216660ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error(transparent)] pub struct Error { message: String, } fn main() {} thiserror-2.0.11/tests/ui/transparent-struct-not-error.stderr000064400000000000000000000013641046102023000225460ustar 00000000000000error[E0599]: the method `as_dyn_error` exists for struct `String`, but its trait bounds were not satisfied --> tests/ui/transparent-struct-not-error.rs:4:9 | 4 | #[error(transparent)] | ^^^^^^^^^^^ method cannot be called on `String` due to unsatisfied trait bounds | ::: $RUST/alloc/src/string.rs | | pub struct String { | ----------------- doesn't satisfy `String: AsDynError<'_>` or `String: std::error::Error` | = note: the following trait bounds were not satisfied: `String: std::error::Error` which is required by `String: AsDynError<'_>` `str: Sized` which is required by `str: AsDynError<'_>` `str: std::error::Error` which is required by `str: AsDynError<'_>` thiserror-2.0.11/tests/ui/transparent-struct-source.rs000064400000000000000000000001761046102023000212400ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error(transparent)] pub struct Error(#[source] anyhow::Error); fn main() {} thiserror-2.0.11/tests/ui/transparent-struct-source.stderr000064400000000000000000000002721046102023000221140ustar 00000000000000error: transparent error struct can't contain #[source] --> tests/ui/transparent-struct-source.rs:5:18 | 5 | pub struct Error(#[source] anyhow::Error); | ^^^^^^^^^ thiserror-2.0.11/tests/ui/transparent-struct-unnamed-field-not-error.rs000064400000000000000000000001551046102023000243720ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error(transparent)] pub struct Error(String); fn main() {} thiserror-2.0.11/tests/ui/transparent-struct-unnamed-field-not-error.stderr000064400000000000000000000014021046102023000252450ustar 00000000000000error[E0599]: the method `as_dyn_error` exists for struct `String`, but its trait bounds were not satisfied --> tests/ui/transparent-struct-unnamed-field-not-error.rs:4:9 | 4 | #[error(transparent)] | ^^^^^^^^^^^ method cannot be called on `String` due to unsatisfied trait bounds | ::: $RUST/alloc/src/string.rs | | pub struct String { | ----------------- doesn't satisfy `String: AsDynError<'_>` or `String: std::error::Error` | = note: the following trait bounds were not satisfied: `String: std::error::Error` which is required by `String: AsDynError<'_>` `str: Sized` which is required by `str: AsDynError<'_>` `str: std::error::Error` which is required by `str: AsDynError<'_>` thiserror-2.0.11/tests/ui/unconditional-recursion.rs000064400000000000000000000001611046102023000207260ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[error("{self}")] pub struct Error; fn main() { __FAIL__; } thiserror-2.0.11/tests/ui/unconditional-recursion.stderr000064400000000000000000000011331046102023000216050ustar 00000000000000error[E0425]: cannot find value `__FAIL__` in this scope --> tests/ui/unconditional-recursion.rs:8:5 | 8 | __FAIL__; | ^^^^^^^^ not found in this scope warning: function cannot return without recursing --> tests/ui/unconditional-recursion.rs:4:9 | 4 | #[error("{self}")] | ^^^^^^^^ | | | cannot return without recursing | recursive call site | = help: a `loop` may express intention better if this is on purpose note: the lint level is defined here --> tests/ui/unconditional-recursion.rs:4:9 | 4 | #[error("{self}")] | ^^^^^^^^ thiserror-2.0.11/tests/ui/unexpected-field-fmt.rs000064400000000000000000000002261046102023000200640ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] pub enum Error { What { #[error("...")] io: std::io::Error, }, } fn main() {} thiserror-2.0.11/tests/ui/unexpected-field-fmt.stderr000064400000000000000000000003121046102023000207370ustar 00000000000000error: not expected here; the #[error(...)] attribute belongs on top of a struct or an enum variant --> tests/ui/unexpected-field-fmt.rs:6:9 | 6 | #[error("...")] | ^^^^^^^^^^^^^^^ thiserror-2.0.11/tests/ui/unexpected-struct-source.rs000064400000000000000000000001311046102023000210320ustar 00000000000000use thiserror::Error; #[derive(Error, Debug)] #[source] pub struct Error; fn main() {} thiserror-2.0.11/tests/ui/unexpected-struct-source.stderr000064400000000000000000000002341046102023000217150ustar 00000000000000error: not expected here; the #[source] attribute belongs on a specific field --> tests/ui/unexpected-struct-source.rs:4:1 | 4 | #[source] | ^^^^^^^^^ thiserror-2.0.11/tests/ui/union.rs000064400000000000000000000001551046102023000152040ustar 00000000000000use thiserror::Error; #[derive(Error)] pub union U { msg: &'static str, num: usize, } fn main() {} thiserror-2.0.11/tests/ui/union.stderr000064400000000000000000000002371046102023000160640ustar 00000000000000error: union as errors are not supported --> tests/ui/union.rs:4:1 | 4 | / pub union U { 5 | | msg: &'static str, 6 | | num: usize, 7 | | } | |_^