m06-error-handling

Rust error handling distinguishes recoverable failures using Result and Option from unrecoverable bugs using panic!. This guide explains propagation, context addition, and recovery design to ensure applications are resilient and maintainable.

Use panic! for unrecoverable bugs and return a Result for recoverable errors. This guide covers decision-making for error propagation, helping distinguish between situations requiring safe recovery and those indicating logic failures.

Choose thiserror for library error design and anyhow for application-level error handling. This guide differentiates custom error types, explaining how to add context and manage propagation across library versus application boundaries.

Add context to Rust errors propagated with the ? operator using libraries like anyhow. This guide explains how to enrich error chains, providing clear messages for API responses, database interactions, and internal logic.

Common Rust error handling anti-patterns include misusing panic! for recoverable errors and ignoring Result values. This guide identifies these pitfalls, guiding robust propagation, context addition, and proper library versus application design.