Access Error trait exclusively through ::thiserror #370
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jimsynz
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Oct 13, 2025
This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [thiserror](https://github.com/dtolnay/thiserror) | dependencies | major | `1.0` -> `2.0` | --- ### Release Notes <details> <summary>dtolnay/thiserror (thiserror)</summary> ### [`v2.0.17`](https://github.com/dtolnay/thiserror/releases/tag/2.0.17) [Compare Source](dtolnay/thiserror@2.0.16...2.0.17) - Use differently named \_\_private module per patch release ([#​434](dtolnay/thiserror#434)) ### [`v2.0.16`](https://github.com/dtolnay/thiserror/releases/tag/2.0.16) [Compare Source](dtolnay/thiserror@2.0.15...2.0.16) - Add to "no-std" crates.io category ([#​429](dtolnay/thiserror#429)) ### [`v2.0.15`](https://github.com/dtolnay/thiserror/releases/tag/2.0.15) [Compare Source](dtolnay/thiserror@2.0.14...2.0.15) - Prevent `Error::provide` API becoming unavailable from a future new compiler lint ([#​427](dtolnay/thiserror#427)) ### [`v2.0.14`](https://github.com/dtolnay/thiserror/releases/tag/2.0.14) [Compare Source](dtolnay/thiserror@2.0.13...2.0.14) - Allow build-script cleanup failure with NFSv3 output directory to be non-fatal ([#​426](dtolnay/thiserror#426)) ### [`v2.0.13`](https://github.com/dtolnay/thiserror/releases/tag/2.0.13) [Compare Source](dtolnay/thiserror@2.0.12...2.0.13) - Documentation improvements ### [`v2.0.12`](https://github.com/dtolnay/thiserror/releases/tag/2.0.12) [Compare Source](dtolnay/thiserror@2.0.11...2.0.12) - Prevent elidable\_lifetime\_names pedantic clippy lint in generated impl ([#​413](dtolnay/thiserror#413)) ### [`v2.0.11`](https://github.com/dtolnay/thiserror/releases/tag/2.0.11) [Compare Source](dtolnay/thiserror@2.0.10...2.0.11) - Add feature gate to tests that use std ([#​409](dtolnay/thiserror#409), [#​410](dtolnay/thiserror#410), thanks [@​Maytha8](https://github.com/Maytha8)) ### [`v2.0.10`](https://github.com/dtolnay/thiserror/releases/tag/2.0.10) [Compare Source](dtolnay/thiserror@2.0.9...2.0.10) - Support errors containing a generic type parameter's associated type in a field ([#​408](dtolnay/thiserror#408)) ### [`v2.0.9`](https://github.com/dtolnay/thiserror/releases/tag/2.0.9) [Compare Source](dtolnay/thiserror@2.0.8...2.0.9) - Work around `missing_inline_in_public_items` clippy restriction being triggered in macro-generated code ([#​404](dtolnay/thiserror#404)) ### [`v2.0.8`](https://github.com/dtolnay/thiserror/releases/tag/2.0.8) [Compare Source](dtolnay/thiserror@2.0.7...2.0.8) - Improve support for macro-generated `derive(Error)` call sites ([#​399](dtolnay/thiserror#399)) ### [`v2.0.7`](https://github.com/dtolnay/thiserror/releases/tag/2.0.7) [Compare Source](dtolnay/thiserror@2.0.6...2.0.7) - Work around conflict with #\[deny(clippy::allow\_attributes)] ([#​397](dtolnay/thiserror#397), thanks [@​zertosh](https://github.com/zertosh)) ### [`v2.0.6`](https://github.com/dtolnay/thiserror/releases/tag/2.0.6) [Compare Source](dtolnay/thiserror@2.0.5...2.0.6) - Suppress deprecation warning on generated From impls ([#​396](dtolnay/thiserror#396)) ### [`v2.0.5`](https://github.com/dtolnay/thiserror/releases/tag/2.0.5) [Compare Source](dtolnay/thiserror@2.0.4...2.0.5) - Prevent deprecation warning on generated impl for deprecated type ([#​394](dtolnay/thiserror#394)) ### [`v2.0.4`](https://github.com/dtolnay/thiserror/releases/tag/2.0.4) [Compare Source](dtolnay/thiserror@2.0.3...2.0.4) - Eliminate needless\_lifetimes clippy lint in generated `From` impls ([#​391](dtolnay/thiserror#391), thanks [@​matt-phylum](https://github.com/matt-phylum)) ### [`v2.0.3`](https://github.com/dtolnay/thiserror/releases/tag/2.0.3) [Compare Source](dtolnay/thiserror@2.0.2...2.0.3) - Support the same Path field being repeated in both Debug and Display representation in error message ([#​383](dtolnay/thiserror#383)) - Improve error message when a format trait used in error message is not implemented by some field ([#​384](dtolnay/thiserror#384)) ### [`v2.0.2`](https://github.com/dtolnay/thiserror/releases/tag/2.0.2) [Compare Source](dtolnay/thiserror@2.0.1...2.0.2) - Fix hang on invalid input inside #\[error(...)] attribute ([#​382](dtolnay/thiserror#382)) ### [`v2.0.1`](https://github.com/dtolnay/thiserror/releases/tag/2.0.1) [Compare Source](dtolnay/thiserror@2.0.0...2.0.1) - Support errors that contain a dynamically sized final field ([#​375](dtolnay/thiserror#375)) - Improve inference of trait bounds for fields that are interpolated multiple times in an error message ([#​377](dtolnay/thiserror#377)) ### [`v2.0.0`](https://github.com/dtolnay/thiserror/releases/tag/2.0.0) [Compare Source](dtolnay/thiserror@1.0.69...2.0.0) ##### Breaking changes - Referencing keyword-named fields by a raw identifier like `{r#type}` inside a format string is no longer accepted; simply use the unraw name like `{type}` ([#​347](dtolnay/thiserror#347)) This aligns thiserror with the standard library's formatting macros, which gained support for implicit argument capture later than the release of this feature in thiserror 1.x. ```rust #[derive(Error, Debug)] #[error("... {type} ...")] // Before: {r#type} pub struct Error { pub r#type: Type, } ``` - Trait bounds are no longer inferred on fields whose value is shadowed by an explicit named argument in a format message ([#​345](dtolnay/thiserror#345)) ```rust // Before: impl<T: Octal> Display for Error<T> // After: impl<T> Display for Error<T> #[derive(Error, Debug)] #[error("{thing:o}", thing = "...")] pub struct Error<T> { thing: T, } ``` - Tuple structs and tuple variants can no longer use numerical `{0}` `{1}` access at the same time as supplying extra positional arguments for a format message, as this makes it ambiguous whether the number refers to a tuple field vs a different positional arg ([#​354](dtolnay/thiserror#354)) ```rust #[derive(Error, Debug)] #[error("ambiguous: {0} {}", $N)] // ^^^ Not allowed, use #[error("... {0} {n}", n = $N)] pub struct TupleError(i32); ``` - Code containing invocations of thiserror's `derive(Error)` must now have a direct dependency on the `thiserror` crate regardless of the error data structure's contents ([#​368](dtolnay/thiserror#368), [#​369](dtolnay/thiserror#369), [#​370](dtolnay/thiserror#370), [#​372](dtolnay/thiserror#372)) ##### Features - Support disabling thiserror's standard library dependency by disabling the default "std" Cargo feature: `thiserror = { version = "2", default-features = false }` ([#​373](dtolnay/thiserror#373)) - Support using `r#source` as field name to opt out of a field named "source" being treated as an error's `Error::source()` ([#​350](dtolnay/thiserror#350)) ```rust #[derive(Error, Debug)] #[error("{source} ==> {destination}")] pub struct Error { r#source: char, destination: char, } let error = Error { source: 'S', destination: 'D' }; ``` - Infinite recursion in a generated Display impl now produces an `unconditional_recursion` warning ([#​359](dtolnay/thiserror#359)) ```rust #[derive(Error, Debug)] #[error("??? {self}")] pub struct Error; ``` - A new attribute `#[error(fmt = path::to::myfmt)]` can be used to write formatting logic for an enum variant out-of-line ([#​367](dtolnay/thiserror#367)) ```rust #[derive(Error, Debug)] pub enum Error { #[error(fmt = demo_fmt)] Demo { code: u16, message: Option<String> }, } fn demo_fmt(code: &u16, message: &Option<String>, formatter: &mut fmt::Formatter) -> fmt::Result { write!(formatter, "{code}")?; if let Some(msg) = message { write!(formatter, " - {msg}")?; } Ok(()) } ``` - Enums with an enum-level format message are now able to have individual variants that are `transparent` to supersede the enum-level message ([#​366](dtolnay/thiserror#366)) ```rust #[derive(Error, Debug)] #[error("my error {0}")] pub enum Error { Json(#[from] serde_json::Error), Yaml(#[from] serde_yaml::Error), #[error(transparent)] Other(#[from] anyhow::Error), } ``` </details> --- ### Configuration 📅 **Schedule**: Branch creation - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) in timezone Pacific/Auckland, Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) in timezone Pacific/Auckland. 🚦 **Automerge**: Disabled because a matching PR was automerged previously. ♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xNy4yIiwidXBkYXRlZEluVmVyIjoiNDEuMTMxLjkiLCJ0YXJnZXRCcmFuY2giOiJtYWluIiwibGFiZWxzIjpbInJlbm92YXRlIl19--> Reviewed-on: https://harton.dev/outrun/outrun/pulls/81 Co-authored-by: Renovate Bot <bot@harton.nz> Co-committed-by: Renovate Bot <bot@harton.nz>
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This gives control of the meaning of
Errorin derive-generated code to thethiserrorcrate's build script and its enabled feature combinations.