Semantic Versioning - Rust Project Primer

Rust’s dependency ecosystem relies on Semantic Versioning (SemVer). When you publish a crate, your version number is a promise to downstream users: patch releases contain only bugfixes, minor releases add functionality without breaking existing code, and only major releases may introduce breaking changes. Cargo’s dependency resolver depends on these promises being accurate — it will happily upgrade to a new minor release without asking, trusting that nothing will break. Getting this right manually is harder than it looks. Some breaking changes are obvious (removing a public function), but others are subtle: adding a new variant to a non-exhaustive enum, changing a type’s auto-trait implementations, or even adding a new public item can break downstream code that uses glob imports. An analysis of the 1,000 most-downloaded crates found that roughly 1 in 6 crates violated semver at least once, affecting about 1 in 31 releases. This is not a failure of discipline — it is a failure of toolin

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• abinaya dinesh