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---
name: fast-rust
description: Practical guidance for writing, refactoring, and reviewing fast, reliable, and maintainable Rust code.
---
# fast-rust
Concise guidance for high-quality Rust engineering, balancing correctness, maintainability, and performance.
## Purpose and Triggers
- Writing new code, refactoring, reviewing, or designing public APIs/CLIs.
- Rust or files with `.rs`.
- Prefer clear boundaries, error semantics, and evolvability.
## Decision Order
1. Correctness and clear boundaries
2. Readability and maintainability
3. Extensibility and evolution cost
4. Performance and optimization
## Workflow
1. Locate the relevant topic below.
2. Apply the guidance and examples.
3. Read the reference if you need more detail.
## Topics
| Topic | Guidance | Reference |
| --- | --- | --- |
| Error Design | Design error boundaries and semantics before propagation | [references/error-design.md](references/error-design.md) |
| Compilation | Optimize build time and release performance with measured changes | [references/compilation-optimization.md](references/compilation-optimization.md) |
| Type Exercise | Type-level exercise for expression engines and dispatch | [references/type-exercise.md](references/type-exercise.md) |
## References
- Each topic file lists source URLs in frontmatter `urls`.
