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# Rust Development

Covers crates, workspaces, and Rust CLIs. Check `Cargo.toml`, `rust-toolchain.toml`, and CI before using newer syntax or APIs. Project conventions win over these defaults.

## Version and Features

- Stay within `package.rust-version` (MSRV) and the pinned toolchain unless the task is an upgrade.
- Use Edition 2024 syntax only when the crate sets `edition = "2024"`.
- Keep features additive. Do not assume `--all-features` compiles when the crate documents mutually exclusive features.

## Defaults

- Stdlib and existing crates first. `thiserror` for library error enums and `anyhow` for application glue only when the crate already uses them or boilerplate justifies it.
- Newtypes for IDs, tokens, and validated values; enums for states. Private first, then `pub(crate)`, then `pub`.