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Otherwise, this option is not recommended, because vendoring is something of a hassle.This makes sense for pre-existing third-party crates that we choose to import.
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a separate GitHub repository), and regularly vendor it into mozilla-central. This is only suitable for highly general-purpose crates, such as smallvec.Put the crate on crates.io and use Cargo to access it at build-time.
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The best choice depends on the details of the binding code in question.
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Note that it's good software engineering practice to write loosely-coupled components anyway.Infrastructure tools that are standalone programs are ideal.This minimizes the C++/Rust boundary layer issues.For components that are relatively standalone, with small and simple APIs.Therefore, Rust is most suitable in the following situations. See "Blockers and obstacles" below for more details about work being done to remedy these weaknesses. Crossing the C++/Rust boundary can be difficult.(The new borrow checker released in Rust 1.31 helped greatly with this.) Rust's learning curve is steep at the start, which can be intimidating.There is a wide variety of experience levels within Mozilla, for both coding and reviewing.One major issue with Rust relates to personnel. Excellent package management and an extensive ecosystem.It is powerful and pleasant to use, particularly once a moderate level of experience has been reached. The safety enables significant changes to existing code to be made quickly and with confidence. In particular, the safety enables code that is designed more actively for performance, especially parallel performance. (Roughly 70% of critical security vulnerabilities are due to memory safety bugs.) Crashes and security vulnerabilities are much less likely.
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Ultimately, choice of language for a code component is an engineering decision, with corresponding trade-offs, and is best decided by individual teams. For existing components it's more complicated!.For new components and completely rewritten components there should be a strong bias towards using Rust, especially for code around Firefox but not within Firefox.In summary, Rust should be used in the following situations. Here's a collection of media queries that will allow you to do that in pure CSS3 code, without a single line of JavaScript code: most of them come from the web site, which is an excellent resource of browser-specific CSS and JavaScript hacks for these kind of tasks.The goal of this section is to provide some high-level guidelines about when Rust should be used. When such scenarios occur, there are a number of CSS and/or JS based techniques to achieve that result. If you're a HTML developer you most likely know that there are times when you need to selectively apply some styles to a specific browser, or to a specific version/build of a browser.