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Google publishes Rust style guide for Android, Chrome and Fuchsia code
Google published a Rust style guide on Wednesday that covers API and implementation design as well as formatting, and said Android, Chromium and other codebases intend to start applying it.
- Google Style Guides is now reporting this
- New headline Was: “Google's Rust Style Guide”
- Our desk filed its story
- google.github.io is now reporting this
Primary sources: Rust Style Guide, Commit adding the guide
Google has published a style guide for the Rust programming language, adding it on Wednesday, Oct. 21, to its public collection of coding style guides1. The guide says it covers API and implementation design, not just formatting1.
Rust is used in google3, Android, ChromeOS, Fuchsia and Chrome, and Google wants that use to be consistent within and across those codebases, the guide says1. It says Android, Chromium and other codebases were consulted in writing it and intend to start applying it, each with its own rules on how strictly1.
The guide tells engineers to follow the official public Rust style rules wherever they do not conflict with it1. It lists an added goal that it says most style guides lack: making the code easy for tools to change during large, codebase-wide refactorings1.
Among its rules, it says to prefer unique ownership and borrowing over Rc and Arc unless the alternative would be unreasonably complex, to prefer expect over unwrap when a panic is needed, and to avoid unstable language features, with exceptions described for Android, Chrome and Fuchsia1. Some rules apply to one codebase only, such as not using async and.await in Chromium1.
Its API design rules are binding for library code and a strong recommendation for application code, which the guide says should favor simplicity over broad reuse1. As of Wednesday evening, the guide itself was the only source for this report; no outlet had covered it1.