---
id: 550e8400-e29b-41d4-a716-446655440000
type: note
title: Example Note - Rust Error Handling
created: 2026-01-17T10:30:00Z
modified: 2026-01-17T10:35:00Z
tags: ["rust", "error-handling", "best-practices"]
status: active
relates_to:
  - guideline-rust-errors
  - pattern-result-type
depends_on:
  - guideline-rust-basics
project: knowledge-base
---

# Example Note - Rust Error Handling

This is an example of a note document generated from the `note.md.tera` template.

## Overview

Rust error handling uses the `Result<T, E>` type for recoverable errors and `panic!` for unrecoverable errors.

## Key Points

- Always use `Result<T>` for operations that can fail
- Use the `?` operator for error propagation
- Create custom error types with `thiserror`
- Provide context with error messages

## Best Practices

1. **Never use `unwrap()` in production code**
   - Use `?` operator instead
   - Or use `unwrap_or()`, `unwrap_or_else()` with defaults

2. **Define clear error types**
   ```rust
   #[derive(Debug, thiserror::Error)]
   pub enum MyError {
       #[error("IO error: {0}")]
       Io(#[from] std::io::Error),

       #[error("Parse error: {0}")]
       Parse(String),
   }
   ```

3. **Provide helpful error messages**
   ```rust
   let config = load_config()
       .map_err(|e| format!("Failed to load config from {}: {}", path, e))?;
   ```

## References

- [[guideline-rust-errors]]
- [[pattern-result-type]]
- [[decision-use-thiserror]]