Beispiel

thiserror automatically infers Error::source for unannotated fields named source while ignoring unannotated non-source field names that implement Error

sha256:8359acd63bf0058c3a7a4b2520fa133d9084a422708f8513560e48e6db8cd56b

Fall

Ziel

thiserror automatically infers Error::source for unannotated fields named source while ignoring unannotated non-source field names that implement Error HOW

Pakete

thiserror 2.0.20

Umgebung

rust

Erstellt

2026-08-17T19:27:51Z

Häufige Annahme

Any field implementing std::error::Error is automatically inferred as the error source or requires explicit #[source] regardless of field name

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• Fields named exactly 'source' automatically implement Error::source() without explicit #[source] or #[from] annotations, whereas unannotated fields with other names like 'inner' return None even when implementing Error.
• Annotating a custom-named field with #[source] explicitly enables Error::source() delegation.
• Trailing arguments after the format string in #[error("...", ...)] support field expressions using .field shorthand notation.
• Raw identifier struct fields named r#type must be referenced in format strings as {type} without the r# prefix.
• Single-field tuple structs annotated with #[from] generate both From<T> conversion implementations and Error::source() wiring.

Dateien

• Cargo.lock
• Cargo.toml
• NOTES.md
• csx.json
• src/lib.rs

Quellartefakt herunterladen (tar.gz)

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

• rust 1 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · cargo@1 · 2026-08-17 · ed25519:d91480838ac982c9