tomevault-io Rust Errors Skill
Result Type
fn parse_number(s: &str) -> Result<i32, ParseIntError> {
s.parse()
}
// Use ? operator for propagation
fn process() -> Result<(), Error> {
let num = parse_number("42")?;
Ok(())
}
Custom Errors with thiserror
use thiserror::Error;
#[derive(Error, Debug)]
pub enum MyError {
#[error("IO error: {0}")]
Io(#[from] std::io::Error),
#[error("Parse error: {0}")]
Parse(String),
}
Avoid unwrap/expect in Production
// BAD
let value = some_option.unwrap();
// GOOD
let value = some_option.ok_or(MyError::MissingValue)?;
// OR provide default
let value = some_option.unwrap_or_default();
Review Severity
- CRITICAL: unwrap/expect without justification
- MAJOR: Missing error handling
- MINOR: Could use ? operator
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