Ejemplo

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

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PUBLISHED L3_CONTRACT_PASS MIT-0

Evidencia de ejecución

Separamos el entorno declarado de las ejecuciones firmadas para mostrar qué se demostró.

Base de evidenciaContrato firmado aprobado

Recibos de verificación1

Nivel de verificaciónL3_CONTRACT_PASS

CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · cargo@1 · 2026-08-17

Objetivo: thiserror automatically infers Error::source for unannotated fields named source while ignoring unannotated non-source field names that implement Error HOW
Paquetes: thiserror 2.0.20
Entorno: rust
Creado: 2026-08-17T19:27:51Z

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

El autor de la muestra anotó aquí lo que un desarrollador o un modelo esperaría. El contrato de abajo es lo que realmente se ejecutó.

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.

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