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Update rust.instructions.md - async fn in traits

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More specific about async fn in traits.
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Dmitry 2025-08-08 12:09:21 +03:00 committed by GitHub
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@ -29,6 +29,7 @@ These instructions are based on [The Rust Book](https://doc.rust-lang.org/book/)
- Use `serde` for serialization and `thiserror` or `anyhow` for custom errors. - Use `serde` for serialization and `thiserror` or `anyhow` for custom errors.
- Implement traits to abstract services or external dependencies. - Implement traits to abstract services or external dependencies.
- Structure async code using `async/await` and `tokio` or `async-std`. - Structure async code using `async/await` and `tokio` or `async-std`.
- When implementing async functions in traits, use native async syntax (Rust 1.75+) by default. Only use the async-trait crate when object-safe traits with dynamic dispatch (dyn Trait) are required.
- Prefer enums over flags and states for type safety. - Prefer enums over flags and states for type safety.
- Use builders for complex object creation. - Use builders for complex object creation.
- Split binary and library code (`main.rs` vs `lib.rs`) for testability and reuse. - Split binary and library code (`main.rs` vs `lib.rs`) for testability and reuse.