RRust By Example

Rust CLI Troubleshooting

Practical cli guide for argument parsing and UX with runnable examples and review-ready checklists.

Topic: CLI

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Rust CLI Troubleshooting

Problem

Teams often struggle with argument parsing and UX when code grows quickly and review cycles shorten. This guide turns that into a repeatable process.

Diagnostic checklist

  • Define one concrete failure mode before changing code.
  • Reduce to a minimal example first.
  • Validate assumptions around ownership, mutability, and API boundaries.
  • Keep fix scope small and testable.

Runnable example

rust
fn main() {
    let data = vec![1, 2, 3, 4];
    let sum: i32 = data.iter().sum();
    println!("sum={}", sum);
}

Counterexample

rust
fn main() {
    let s = String::from("hello");
    let moved = s;
    println!("{}", s); // moved value
}

How to decide in production

1. Start with correctness and explicit ownership.

2. Add instrumentation before optimizing.

3. Keep interfaces small and typed.

4. Record tradeoffs directly in code and PR description.

Related reading

Related Guides

Rust CLI Debug Checklist

Practical cli guide for argument parsing and UX with runnable examples and review-ready checklists.

Rust CLI Production Guide

Practical cli guide for argument parsing and UX with runnable examples and review-ready checklists.

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